The Hallmarks of Aging

In the paper

“SIRT2 and SIRT6 may also down-regulate the inflammatory response through deacetylation of NF-kB subunits and transcriptional repression of their target genes”

What the sources say

• Disputed

  The Discussion (page not provided) says SIRT6 represses NF-κB signaling by deacetylating histone H3K9, not an NF-κB subunit, and reports no significant SIRT6 deacetylase activity on RELA in vitro or in cells. The Results support repression of a subset of NF-κB target genes, but the claimed deacetylation mechanism is contrary to the paper’s findings; the cited passages provide no finding about SIRT2. (LLM, conf=0.87)

  Checked by a reasoning model — may be wrong.

  cites Kawahara et al., 2009 sourceExperimental — accuracy not yet measured
• Partly supported

  The Abstract and the section on SIRT2-dependent gene expression report that SIRT2 deacetylates the NF-κB subunit p65 and limits expression of a subset of its target genes. The Discussion explicitly says SIRT6 does not deacetylate p65; it describes SIRT6 as attenuating NF-κB signaling by deacetylating histone H3K9 instead. Thus the proposed mechanism is supported for SIRT2, not SIRT6. (LLM, conf=0.90)

  cites Rothgiesser et al., 2010 sourceExperimental — accuracy not yet measured

In the paper

“This is especially relevant when DNA damage impacts on the functional competence of stem cells, thus compromising their role in tissue renewal (Jones and Rando, 2011; Rossi et al., 2008) (see also the section Stem Cell Exhaustion).”

What the sources say

• Supported

  The ‘Changes in tumour suppressor responses downstream of DNA damage’ section says that responses to DNA damage may affect stem cell function and that reduced stem cell activity conflicts with tissue homeostasis and repair. The ‘Failure of self-renewal’ section also links sensitivity to DNA damage with loss of stem cell self-renewal. The claim is appropriately conditional; the paper does not establish that DNA damage causes normal age-related stem cell decline. (LLM, conf=0.87)

  cites Jones and Rando, 2011 source
• Supported

  The indexed Abstract passage says that DNA damage can diminish functional stem-cell reserves, with reduced regenerative potential predicted when those reserves cannot sustain self-renewal and mature-cell production. Another passage links accumulated DNA damage in aging stem cells to their diminished ability to regenerate tissue after injury. Together, these support the claim's conditional wording. (LLM, conf=0.91)

  cites Rossi et al., 2008 source

In the paper

“Increased clonal mosaicism for large chromosomal anomalies has been also reported (Jacobs et al., 2012; Laurie et al., 2012).”

What the sources say

• Supported

  The Abstract reports large mosaic chromosomal abnormalities and an increase in their frequency with age among cancer-free individuals. The Results also describe mosaic segments larger than 2 Mb, supporting the reference to large chromosomal anomalies. (LLM, conf=0.92)

  cites Jacobs et al., 2012 source
• Supported

  The Discussion reports that detectable clonal mosaicism for large chromosomal anomalies in peripheral blood rises rapidly after age 50. This supports the reported increase, although the citing sentence omits the age and tissue context. (LLM, conf=0.94)

  cites Laurie et al., 2012 source

In the paper

“Other forms of DNA damage, such as chromosomal aneuploidies and copy-number variations have also been found associated with aging (Faggioli et al., 2012; Forsberg et al., 2012).”

What the sources say

• Partly supported

  The Introduction and Results report that chromosomal aneuploidy increased with age in the mouse cerebral cortex, though not in the cerebellum or spleen. The paper examines whole-chromosome gains and losses; our copy does not report an age association for copy-number variations as a separate category. (LLM, conf=0.88)

  cites Faggioli et al., 2012 sourceExperimental — accuracy not yet measured
• Supported

  The Abstract and Introduction report age-related accumulation of copy-number variations in human blood cells, and the Results provide statistical support for the association. This supports the copy-number-variation part of the sentence attributed to Forsberg et al.; the sentence also cites a separate source for chromosomal aneuploidies. (LLM, conf=0.93)

  cites Forsberg et al., 2012 source

In the paper

“The time-dependent accumulation of cellular damage is widely considered the general cause of aging (Gems and Partridge, 2013; Kirkwood, 2005; Vijg and Campisi, 2008).”

What the sources say

• ?Not checked — no full text of the sourcecites Gems and Partridge, 2013 source
• ?Not checked — no full text of the sourcecites Kirkwood, 2005 source
• Partly supported

  The ‘Intrinsic ageing’ section says lifelong accumulation of somatic damage might underlie intrinsic ageing, supporting the damage-accumulation idea. But Box 2 says it is unknown whether macromolecular damage is the sole cause of ageing, so the paper does not establish damage accumulation as the general cause. (LLM, conf=0.88)

  cites Vijg and Campisi, 2008 sourceExperimental — accuracy not yet measured

In the paper

“Deletion of components of histone methylation complexes extends longevity in nematodes and flies (Greer et al., 2010; Siebold et al., 2010).”

What the sources say

• Supported

  Greer et al. report that deletion of the histone-methylation-complex components WDR-5 and SET-2 extends C. elegans lifespan (main text, page unavailable). In the jointly cited sentence, Greer et al. support the nematode portion; the fly portion is attributed to the separately cited Siebold et al. (LLM, conf=0.92)

  cites Greer et al., 2010 source
• Partly supported

  The Results report longer lifespans in flies heterozygous for null mutations in the PRC2 subunits E(z) and esc, supporting the fly portion of the sentence. They do not report deletion of the components themselves; the tested flies retained one functional copy. The nematode portion is attributed to the other citation, not this paper. (LLM, conf=0.82)

  cites Siebold et al., 2010 sourceExperimental — accuracy not yet measured

In the paper

“Mutations and deletions in aged mtDNA may also contribute to aging (Park and Larsson, 2011).”

What the sources say

• Supported

  The Abstract says mtDNA mutations are heavily implicated in aging. The ‘Aging and somatic mtDNA mutations’ section reports that mutator mice develop premature aging associated with accumulated point mutations and linear deleted mtDNA molecules. The claim’s ‘may contribute’ wording is consistent with that evidence, although the paper distinguishes linear deleted molecules from circular deletions, whose proposed role it questions. (LLM, conf=0.88)

  cites Park and Larsson, 2011 source

In the paper

“Telomere dysfunction also promotes progerin production in normal human fibroblasts upon prolonged in vitro culture, suggesting intimate links between telomere maintenance and progerin expression during normal aging (Cao et al., 2011).”

What the sources say

• Supported

  The Discussion states that shortened or uncapped telomeres activate progerin production in primary fibroblasts. The Introduction also reports that progerin-producing splicing is activated as cells approach senescence with successive passages, supporting the prolonged in vitro culture context. (LLM, conf=0.94)

  cites Cao et al., 2011 source

In the paper

“Regarding mammals, several studies have shown that several of the seven mammalian sirtuins can delay various parameters of aging in mice (Houtkooper et al., 2012; Sebastian et al., 2012).”

What the sources say

• Supported

  The Abstract identifies seven mammalian sirtuins. The References section reports that SIRT1 overexpression improves healthy aging in mice, while the SIRT3 section reports SIRT3-dependent protection against age-related hearing loss under caloric restriction. These support the claim about several sirtuins and different aging-related outcomes; the paper does not claim that SIRT1 overexpression extends lifespan. (LLM, conf=0.88)

  cites Houtkooper et al., 2012 source
• Supported

  The Aging section describes three mammalian sirtuins associated with different aging outcomes in mice: SIRT1 protects against age-related pathologies, SIRT3 mediates calorie restriction’s prevention of age-related hearing loss, and SIRT6 overexpression extends lifespan. The review qualifies the SIRT6 effect as modest and observed only in males; the claim’s broad wording is consistent with those findings. (LLM, conf=0.88)

  cites Sebastian et al., 2012 source

In the paper

“Cells from patients and mice with progeroid syndromes exhibit DNA methylation patterns and histone modifications that largely recapitulate those found in normal aging (Osorio et al., 2010; Shumaker et al., 2006).”

What the sources say

• Partly supported

  The Discussion reports that Zmpste24-deficient mice have rDNA hypermethylation also seen in physiological aging, and the paper reports H2B and H4 hypoacetylation in those mice. But the Discussion says global DNA methylation did not change in the progeroid mice, unlike a trend reported for normal aging. The paper does not establish that the measured histone changes largely recapitulate normal aging or demonstrate the claimed pattern in patient cells. (LLM, conf=0.86)

  cites Osorio et al., 2010 sourceExperimental — accuracy not yet measured
• Partly supported

  The Discussion (page not provided) says histone changes in HGPS cells reflect aspects of normal aging, citing increased H4K20me3 as one example. The paper examines human HGPS cells and histone marks; it does not establish DNA methylation patterns or findings in progeroid mice, and “largely recapitulate” is broader than its stated conclusion. (LLM, conf=0.88)

  cites Shumaker et al., 2006 sourceExperimental — accuracy not yet measured

In the paper

“Various loss-of-function models for shelterin components are characterized by rapid decline of the regenerative capacity of tissues and accelerated aging, a phenomenon that occurs even in the presence of telomeres with a normal length (Martinez and Blasco, 2010).”

What the sources say

• Partly supported

  The mouse-model overview says shelterin defects can cause aging-related pathologies despite normal telomere length. The TRF1 section reports stem-cell defects and premature tissue degeneration without telomere shortening, and the TPP1 section reports degenerative defects in additional models. But the claim overgeneralizes the regenerative decline and normal-length condition: the TRF2 section says liver regeneration was preserved after TRF2 deletion, while conditional TPP1 deletion caused accelerated telomere shortening. (LLM, conf=0.82)

  cites Martinez and Blasco, 2010 sourceExperimental — accuracy not yet measured

In the paper

“DNA- and histone-modifying enzymes act in concert with key chromosomal proteins, such as the heterochromatin protein 1α (HP1α), and chromatin remodeling factors, such as Polycomb group proteins or the NuRD complex, whose levels are diminished in both normally and pathologically aged cells (Pegoraro et al., 2009; Pollina and Brunet, 2011).”

What the sources say

• Partly supported

  Split into 2 atoms — 0 confirmed, 2 partially supported, 0 disputed, 0 misattributed, 0 unverifiable. Expand the claim to see per-atom verdicts.

  cites Pegoraro et al., 2009 sourceExperimental — accuracy not yet measured
• ?Not matched

  Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  cites Pollina and Brunet, 2011

In the paper

“Restoration of the somatotrophic axis through hormonal treatments or inhibition of NF-κB signaling also extends lifespan in these progeroid mice (Marino et al., 2010; Osorio et al., 2012).”

What the sources say

• Supported

  The Results report that recombinant IGF-1 treatment restored aspects of somatotroph-axis function and significantly extended longevity in Zmpste24−/− progeroid mice. The citing sentence pairs this paper with the hormonal-treatment finding; its separate NF-κB claim is paired with Osorio et al. (2012). (LLM, conf=0.93)

  cites Marino et al., 2010 source
• Supported

  The Osorio citation supports the NF-κB-inhibition part of the sentence; the separate hormonal-treatment claim is not attributed to it. The Discussion states that NF-κB blockade significantly increased lifespan in two progeroid mouse models, and the section on pharmacological inhibition reports extended survival in treated Lmna G609G/G609G mice. (LLM, conf=0.93)

  cites Osorio et al., 2012 source

In the paper

“Very recently, overexpression of SIRT3 has been reported to reverse the regenerative capacity of aged hematopoietic stem cells (Brown et al., 2013).”

What the sources say

• Supported

  The Results section, “SIRT3 upregulation rescues functional defects of aged HSCs,” reports that SIRT3 overexpression improved colony formation and functional reconstitution in aged hematopoietic stem cells. This supports the citing sentence’s intended meaning that overexpression reverses an age-related loss of regenerative capacity. (LLM, conf=0.94)

  cites Brown et al., 2013 source

In the paper

“Gain- and loss-of-function studies have confirmed the capacity of several miRNAs to modulate longevity in Drosophila melanogaster and C. elegans (Liu et al., 2012; Shen et al., 2012; Smith-Vikos and Slack, 2012).”

What the sources say

• Supported

  Liu et al. report that deleting miR-34 caused a sharp decline in survival in adult Drosophila, while increasing its expression extended median lifespan by about 10% (Abstract; no page supplied). This supports the fly gain- and loss-of-function component of the sentence, which cites other papers alongside Liu et al. for the broader claim. (LLM, conf=0.91)

  cites Liu et al., 2012 source
• Supported

  The paper’s lifespan experiments report that loss of mir-84 and mir-241 abolished germline-ablation-induced longevity in C. elegans, while transgenes restored longevity in the mutants. It also reports an effect of mir-48 mutation. This supports the C. elegans portion for which Shen et al. is cited; the sentence cites other works alongside it for the broader cross-species statement. (LLM, conf=0.88)

  cites Shen et al., 2012 source
• ?Not checked — no full text of the sourcecites Smith-Vikos and Slack, 2012 source

In the paper

“Telomerase deficiency in humans is associated with premature development of diseases, such as pulmonary fibrosis, dyskeratosis congenita and aplastic anemia, which involve the loss of the regenerative capacity of different tissues (Armanios and Blackburn, 2012).”

What the sources say

• Partly supported

  The Adult-onset manifestations and Childhood-onset telomere disorders sections link telomerase or telomere-gene defects to pulmonary fibrosis, aplastic anaemia and dyskeratosis congenita. The Stem cell failure section describes loss of blood-forming stem-cell capacity, but Multiple hits are additive to telomere dysfunction in slow-turnover tissues says that loss of epithelial stem cells as a cause of lung fibrosis is a hypothesis, not an established mechanism. The claim overstates regenerative failure as a shared explanation for all three diseases. (LLM, conf=0.84)

  cites Armanios and Blackburn, 2012 sourceExperimental — accuracy not yet measured

In the paper

“These findings have recently been called into question, however, with the report that the lifespan extension originally observed in the worm and fly studies was mostly due to confounding genetic background differences and not to the overexpression of sir-2.1 or dSir2, respectively (Burnett et al., 2011).”

What the sources say

• Supported

  The Abstract says that standardizing genetic background and using appropriate controls abolished the apparent lifespan effects in both worms and flies. It reports that worm longevity disappeared after outcrossing despite continued sir-2.1 overexpression, while dSir2-overexpressing flies were not longer-lived than appropriate transgenic controls. (LLM, conf=0.93)

  cites Burnett et al., 2011 source

In the paper

“Aging is associated with an increase in transcriptional noise (Bahar et al., 2006), and an aberrant production and maturation of many mRNAs (Harries et al., 2011; Nicholas et al., 2010).”

What the sources say

• Partly supported

  The Abstract reports age-associated changes in mRNA-processing pathways and altered isoform balance for selected genes. The Discussion reports disrupted isoform patterns in seven of ten genes studied, but describes an increase in aberrantly spliced transcripts as a possibility. The claim overstates this as established aberrant production and maturation of many mRNAs. (LLM, conf=0.85)

  cites Harries et al., 2011 sourceExperimental — accuracy not yet measured
• Partly supported

  The Abstract reports an age-related decline in A-to-I editing of CYFIP2 mRNA in human cortex, supporting an association between aging and altered mRNA processing. But the study examined only two transcripts, found GABRA3 editing much more stable, and did not establish aberrant production or maturation of many mRNAs. (LLM, conf=0.88)

  cites Nicholas et al., 2010 sourceExperimental — accuracy not yet measured

In the paper

“Alterations in these epigenetic factors together with the above discussed epigenetic modifications in histones and DNA-methylation determine changes in chromatin architecture, such as global heterochromatin loss and redistribution, which constitute characteristic features of aging (Oberdoerffer and Sinclair, 2007; Tsurumi and Li, 2012).”

What the sources say

• ?Not checked — no full text of the sourcecites Oberdoerffer and Sinclair, 2007 source
• Partly supported

  Split into 2 atoms — 1 confirmed, 1 partially supported, 0 disputed, 0 misattributed, 0 unverifiable. Expand the claim to see per-atom verdicts.

  cites Tsurumi and Li, 2012 sourceExperimental — accuracy not yet measured

In the paper

“The nuclear lamina attracted the attention of aging researchers after the discovery that mutations in genes encoding protein components of this structure, or factors affecting their maturation and dynamics, cause accelerated aging syndromes such as the Hutchinson-Gilford and the Néstor-Guillermo progeria syndromes (HGPS and NGPS, respectively) (Cabanillas et al., 2011; De Sandre-Giovannoli et al.,”

What the sources say

• ?Not checked — no full text of the sourcecites Cabanillas et al., 2011 source
• ?Not checked — no full text of the sourcecites De Sandre-Giovannoli et al., 2003 source
• Partly supported

  The Abstract (page not available in our copy) identifies LMNA mutations in lamin A, a nuclear-lamina component, as a cause of Hutchinson-Gilford progeria syndrome. It also describes a lamin-processing factor whose loss produces HGPS-like features in mice, but it does not establish that mutations in maturation factors cause a human progeria syndrome or address Néstor-Guillermo progeria syndrome. (LLM, conf=0.90)

  cites Eriksson et al., 2003 sourceExperimental — accuracy not yet measured

In the paper

“Shelterin mutations have been found in some cases of aplastic anemia and dyskeratosis congenita (Savage et al., 2008; Walne et al., 2008; Zhong et al., 2011).”

What the sources say

• ?Not checked — no full text of the sourcecites Savage et al., 2008 source
• Supported

  The Introduction identifies TINF2 as a component of the shelterin complex, and the Results report TINF2 mutations in patients with dyskeratosis congenita. Results Table 2 also lists two patients diagnosed with aplastic anemia who carried a TINF2 mutation. The claim is supported as a statement about some cases, not aplastic anemia generally. (LLM, conf=0.94)

  cites Walne et al., 2008 source
• Partly supported

  The passage labeled Abstract (page not provided) says mutations in the telomere-binding protein TIN2 can cause dyskeratosis congenita; the References identify TIN2 as a shelterin component. The paper also mentions aplastic anemia among telomere-related diseases, but does not link it specifically to shelterin mutations. (LLM, conf=0.86)

  cites Zhong et al., 2011 sourceExperimental — accuracy not yet measured

In the paper

“Interestingly, contrary to previous expectations, most mtDNA mutations in adult or aged cells appear to be caused by replication errors early in life, rather than by oxidative damage.”

What the sources say

• Partly supported

  The Abstract says the mouse results indicate that most somatic mtDNA mutations arise from replication errors during development, and the Results section finds no oxidative-damage signature. The study examined mouse liver mtDNA, however, so the claim extends that conclusion to adult or aged cells generally. (LLM, conf=0.83)

  cites Ameur et al., 2011 sourceExperimental — accuracy not yet measured

In the paper

“In the case of the machinery that ensures faithful chromosomal segregation, there is genetic evidence that its enhancement can extend longevity in mammals (Baker et al., 2012).”

What the sources say

• Supported

  The paper identifies BubR1 as a component of the mitotic checkpoint that helps ensure proper chromosome segregation. It reports that genetically increasing BubR1 expression extends median and maximum lifespan in mice, supporting the claim about longevity in mammals. The paper does not establish that improved segregation itself causes the lifespan extension, but the citing sentence does not require that mechanism. (LLM, conf=0.92)

  cites Baker et al., 2012 source

In the paper

“These mutations may undergo polyclonal expansion and cause respiratory chain dysfunction in different tissues (Ameur et al., 2011).”

What the sources say

• Partly supported

  The Introduction (page unavailable) says that somatic mtDNA mutations undergo clonal expansion and cause mosaic respiratory-chain deficiency in several tissues. It does not support the claim’s specific term “polyclonal”; it says “clonal” instead. (LLM, conf=0.88)

  cites Ameur et al., 2011 sourceExperimental — accuracy not yet measured

In the paper

“Moreover, histone demethylases modulate lifespan by targeting components of key longevity routes such as the insulin/IGF-1 signaling pathway (Jin et al., 2011).”

What the sources say

• Supported

  The Introduction reports that knocking down the histone demethylase UTX-1 extends C. elegans lifespan while changing expression of insulin/IGF-1 signaling genes. The Results show that this lifespan extension depends on components of that pathway, including daf-2 and daf-16. The claim is supported as an example involving UTX-1, not as a finding about all histone demethylases. (LLM, conf=0.92)

  cites Jin et al., 2011 source

In the paper

“Moreover, the recent discovery of transgenerational epigenetic inheritance of longevity in C. elegans suggests that manipulation of specific chromatin modifications in parents can induce an epigenetic memory of longevity in their descendants (Greer et al., 2011).”

What the sources say

• Supported

  The Results state that the authors tested whether perturbing H3K4me3 regulators only in parents could affect descendants’ lifespan. The Discussion describes their findings as epigenetic inheritance of longevity, and the ‘Specificity of epigenetic memory of lifespan’ section links the effect specifically to H3K4me3 chromatin modifiers. (LLM, conf=0.92)

  cites Greer et al., 2011 source

In the paper

“The first evidence that mtDNA damage might be important for aging and age-related diseases derived from the identification of human multisystem disorders caused by mtDNA mutations that partially phenocopy aging (Wallace, 2005).”

What the sources say

• Supported

  The passage headed “Pathogenic mtDNA Mutations” says the first evidence linking mtDNA mutations to aging and age-related degenerative diseases came from identifying systemic diseases caused by those mutations. It also says these diseases have a delayed, progressive course and produce clinical problems seen in aging across multiple tissues. (LLM, conf=0.94)

  cites Wallace, 2005 source

In the paper

“In humans, recent meta-analyses have indicated a strong relation between short telomeres and mortality risk, particularly at younger ages (Boonekamp et al., 2013).”

What the sources say

• ?Could not verify

  The available indexed copy contains bibliographic details and keywords (labeled Abstract, with no page number), but no passage discussing the strength of the association between short telomeres and mortality or whether it is stronger at younger ages. Searches for the claimed meta-analyses and for age-specific mortality risk found no substantive passage. (LLM, conf=0.72)

  cites Boonekamp et al., 2013 sourceExperimental — accuracy not yet measured

In the paper

“Therefore, DNA damage at telomeres causes a persistent type of DNA damage that leads to deleterious cellular effects including senescence and/or apoptosis (Fumagalli et al., 2012; Hewitt et al., 2012).”

What the sources say

• Partly supported

  The Results section states that DNA breaks at telomeres resist repair, produce persistent DNA-damage-response foci, and fuel cellular senescence; the Discussion likewise links irreparable telomeric damage to senescence. Our copy does not link this damage to apoptosis: the only exact mention of apoptosis is in a reference title. No page numbers are provided in the indexed passages. (LLM, conf=0.88)

  cites Fumagalli et al., 2012 sourceExperimental — accuracy not yet measured
• Partly supported

  The Abstract reports that persistent damage foci are associated with telomeres, and the Discussion identifies persistent telomere-associated damage as a component of stress-induced senescence. The Abstract mentions apoptosis as a possible outcome of DNA damage generally, but does not establish it as an outcome of telomeric damage specifically. No page numbers are available in our copy. (LLM, conf=0.86)

  cites Hewitt et al., 2012 sourceExperimental — accuracy not yet measured

In the paper

“Moreover, in response to DNA damage, SIRT1 and other chromatin-modifying proteins relocalize to DNA breaks to promote repair and genomic stability (Oberdoerffer et al., 2008).”

What the sources say

• Supported

  The Results section, “SIRT1 is recruited to DNA double strand breaks,” reports SIRT1 binding at an induced break and states that chromatin-modifying enzymes are recruited to breaks to prepare for repair factors. The Discussion section, “SIRT1 is recruited to DSBs and is required for efficient DNA repair,” says SIRT1 is required for efficient break repair and genome maintenance. (LLM, conf=0.92)

  cites Oberdoerffer et al., 2008 source

In the paper

“Studies of accelerated aging in HIV-infected patients treated with anti-retroviral drugs, which interfere with mtDNA replication, have supported the concept of clonal expansion of mtDNA mutations originated early in life (Payne et al., 2011).”

What the sources say

• Partly supported

  The paper’s Abstract reports that nucleoside analog anti-retroviral drugs can interfere with mtDNA replication and that, in treated HIV-infected patients, pre-existing age-related mtDNA mutations undergo accelerated clonal expansion. It does not establish that those mutations originated early in life; it describes them as pre-existing before expansion during treatment. (LLM, conf=0.84)

  cites Payne et al., 2011 sourceExperimental — accuracy not yet measured

In the paper

“Moreover, stem cells from these progeroid mice are particularly sensitive to the accumulation of mtDNA mutations (Ahlqvist et al., 2012) (see also the section on Stem Cell Exhaustion).”

What the sources say

• Supported

  The Summary reports neural and hematopoietic progenitor dysfunction in progeroid Polg-Mutator mice and proposes that the somatic stem-cell compartment is sensitive to mtDNA mutagenesis. The paper specifies defective Polg exonuclease activity, rather than complete loss of polymerase γ. (LLM, conf=0.94)

  cites Ahlqvist et al., 2012 source

In the paper

“In particular, the premature aging of telomerase-deficient mice can be reverted when telomerase is genetically reactivated in these aged mice (Jaskelioff et al., 2011).”

What the sources say

• Supported

  The paper’s main text describes adults with significant premature-aging phenotypes and reports reversal of tissue atrophy in late-generation TERT-ER mice after telomerase reactivation. Its conclusion also describes reversal of age-related decline in the CNS and other organs. No page number is available in our copy. (LLM, conf=0.93)

  cites Jaskelioff et al., 2011 source

In the paper

“Moreover, normal physiological aging can be delayed without increasing the incidence of cancer in adult wild-type mice by pharmacological activation or systemic viral transduction of telomerase (Bernardes de Jesus et al., 2012; de Jesus et al., 2011).”

What the sources say

• Supported

  The Results describe systemic AAV9-mTERT transduction after tail-vein injection in adult and old mice. The paper’s discussion says this gene therapy delayed physiological aging in normal wild-type mice, and its results report no increase in neoplasias versus controls. The pharmacological route is paired with a separate 2011 citation in the citing sentence; this paper supports the viral-transduction route. (LLM, conf=0.93)

  cites Bernardes de Jesus et al., 2012 source
• Supported

  This paper supports the pharmacological-activation part of the jointly cited sentence; the viral-transduction part is associated with the other citation. The Methods describe TA-65 treatment of adult and old female mice, and the Results report improved health-span measures without increased cancer incidence. The Discussion clarifies that TA-65 did not extend survival, which the citing sentence does not claim. (LLM, conf=0.88)

  cites de Jesus et al., 2011 source

In the paper

“A variety of epigenetic alterations affects all cells and tissues throughout life (Talens et al., 2012) (Figure 2B).”

What the sources say

• Partly supported

  The Discussion (page unavailable) reports that epigenetic changes accumulate across the adult lifespan and describes several forms of epigenetic variation. But the study examined DNA methylation in blood, and its suggestion that other tissues may be similarly affected does not establish that alterations affect all cells and tissues throughout life. (LLM, conf=0.86)

  cites Talens et al., 2012 sourceExperimental — accuracy not yet measured

In the paper

“Microarray-based comparisons of young and old tissues from several species have identified age-related transcriptional changes in genes encoding key components of inflammatory, mitochondrial and lysosomal degradation pathways (de Magalhaes et al., 2009).”

What the sources say

• Supported

  The Introduction describes microarray studies comparing young and old tissues across species and says this meta-analysis used datasets from mice, rats, and humans. It reports increased expression of inflammation and immune-response genes and reduced expression of mitochondrial genes; the Discussion reports increased expression of lysosome-related genes, including cathepsins. (LLM, conf=0.92)

  cites de Magalhaes et al., 2009 source

In the paper

“In mice, genetic manipulations that increase mitochondrial ROS and oxidative damage do not accelerate aging”

What the sources say

• ?Not checked — no full text of the sourcecites Van Remmen et al., 2003 source
• Partly supported

  The Abstract and Results report increased oxidative damage but no reduction in life span in mice deficient in MnSOD and Gpx-1. The claim goes beyond that finding: increased mitochondrial ROS was not directly established in these passages, and the Abstract reports more neoplasms in older mice, so unchanged longevity does not establish that aging was unaffected more broadly. (LLM, conf=0.86)

  cites Zhang et al., 2009 sourceExperimental — accuracy not yet measured

In the paper

“Likewise, the enhancement of proteasome activity by deubiquitylase inhibitors or proteasome activators accelerates the clearance of toxic proteins in human cultured cells (Lee et al., 2010), and extends replicative lifespan in yeast (Kruegel et al., 2011).”

What the sources say

• Partly supported

  In “A Usp14 inhibitor accelerates proteolysis in cells” (page unavailable), the paper reports that the deubiquitylase inhibitor IU1 enhanced degradation of Tau and depleted other proteins implicated in proteotoxicity, but those experiments used mouse embryonic fibroblasts. It also reports reduced accumulation of oxidized proteins and reduced toxicity in cultured human HEK293 cells. The claim overgeneralizes these findings to deubiquitylase inhibitors or proteasome activators as broader classes, and places the demonstrated clearance of the named toxic proteins in human cells. (LLM, conf=0.87)

  cites Lee et al., 2010 sourceExperimental — accuracy not yet measured

In the paper

“The reduced efficiency of mitochondrial bioenergetics with aging may result from multiple converging mechanisms including reduced biogenesis of mitochondria, for instance as a consequence of telomere attrition in telomerase-deficient mice, with subsequent p53-mediated repression of PGC-1α and PGC-1β”

What the sources say

• Supported

  The “Telomere–mitochondrion connection” section reports reduced mitochondrial biogenesis and function in TERT-deficient mice with telomere dysfunction. It links those changes to p53-mediated suppression of PGC1α and PGC1β, supporting the cited example of a possible mechanism of age-related mitochondrial decline. Page numbers were not supplied in our copy. (LLM, conf=0.94)

  cites Sahin and Depinho, 2012 source

In the paper

“there are cases of progeroid mice with very low levels of IGF-1, in which supplementation of IGF-1 can ameliorate premature aging”

What the sources say

• Supported

  The Results report significantly reduced circulating IGF-1 in Zmpste24−/− progeroid mice, followed by improved progeroid features and longer survival after recombinant IGF-1 treatment. This directly supports the claim for the mouse model studied. (LLM, conf=0.94)

  cites Marino et al., 2010 source

In the paper

“The mTOR kinase is part of two multiprotein complexes, mTORC1 and mTORC2, that regulate essentially all aspects of anabolic metabolism”

What the sources say

• Supported

  The Overview of the mTOR pathway identifies mTORC1 and mTORC2 as two multiprotein complexes sharing the mTOR catalytic subunit. The Introduction says mTOR signaling impacts most major cellular functions, and the sections on processes downstream of mTORC1 and the mTORC2 signaling network describe their roles in synthesis and metabolism. Together, these support the citing sentence as a broad paraphrase. (LLM, conf=0.83)

  cites Laplante and Sabatini, 2012 source

In the paper

“metformin can increase mouse lifespan when administered from early life”

What the sources say

• Supported

  The Abstract reports that metformin treatment begun at 3 months increased mean lifespan by 14% in female SHR mice. The Results (Table 3) give the corresponding control and treatment values, supporting the claim that metformin can increase mouse lifespan when started early in life. (LLM, conf=0.94)

  cites Anisimov et al., 2011 source

In the paper

“Interventions using chemical inducers of macroautophagy (another type of autophagy different from chaperone-mediated autophagy) have spurred extraordinary interest after the discovery that constant or intermittent administration of the mTOR inhibitor rapamycin can increase the lifespan of middle-aged mice (Blagosklonny, 2011; Harrison et al., 2009).”

What the sources say

• Partly supported

  The paper states that rapamycin extends lifespan in mice, and its References list a study in which rapamycin fed late in life extended mouse lifespan. In Summary and Further Perspective (page not available), intermittent administration is proposed to avoid metabolic alterations, not reported to extend lifespan. The cited copy therefore does not establish the claim for intermittent treatment or specifically for middle-aged mice. (LLM, conf=0.85)

  cites Blagosklonny, 2011 sourceExperimental — accuracy not yet measured
• Partly supported

  The Abstract reports that rapamycin-fed mice lived longer when treatment began at 600 days of age, and describes increased survival in a separate study begun at 270 days. The Methods Summary (Mice; Diet preparation) describes rapamycin incorporated into their food, but the paper does not report an intermittent-administration regimen or show that one extends lifespan. No page numbers are available in our copy. (LLM, conf=0.88)

  cites Harrison et al., 2009 sourceExperimental — accuracy not yet measured

In the paper

“The activities of the two principal proteolytic systems implicated in protein quality control, namely, the autophagy-lysosomal system and the ubiquitin-proteasome system, decline with aging (Rubinsztein et al., 2011; Tomaru et al., 2012), supporting the idea that collapsing proteostasis constitutes a common feature of old age.”

What the sources say

• ?Not checked — no full text of the sourcecites Rubinsztein et al., 2011 source
• Partly supported

  The Abstract states that proteasomal activity decreases with age and identifies the lysosomal and ubiquitin–proteasome systems as the two major intracellular proteolytic systems. It does not say that autophagy–lysosomal activity also declines with aging, so it supports only the proteasome portion of the joint claim. (LLM, conf=0.86)

  cites Tomaru et al., 2012 sourceExperimental — accuracy not yet measured

In the paper

“Accordingly, many studies have demonstrated that proteostasis is altered with aging (Koga et al., 2011).”

What the sources say

• Supported

  The Introduction describes growing evidence that failure of the proteostasis network is an early event in aging. Section 4.1.2 reports that many studies found age-related decreases in proteasome activity across several tissues, while noting that the decline is not universal. Together, these passages support the broad claim that proteostasis changes with aging. (LLM, conf=0.93)

  cites Koga et al., 2011 source

In the paper

“Multiple genetic manipulations that attenuate signaling intensity at different levels of the IIS pathway consistently extend the lifespan of worms, flies and mice”

What the sources say

• Partly supported

  The nutrient-sensing sections report lifespan extension from reduced IIS in worms and flies, and from GH/IGF-I-related genetic interventions in mice. But the rodents section says reduced IGF-I receptor expression extends lifespan in female, not male, mice and may depend on genetic background. Thus “consistently” overstates the evidence for mice. Page numbers are unavailable in our copy. (LLM, conf=0.88)

  cites Fontana et al., 2010 sourceExperimental — accuracy not yet measured

In the paper

“Spermidine, another macroautophagy inducer that, in contrast to rapamycin, has no immunosuppressive side-effects, also promotes longevity in yeast, flies and worms via the induction of autophagy (Eisenberg et al., 2009).”

What the sources say

• Supported

  The Discussion states that spermidine supplementation prolongs lifespan in yeast, flies and nematodes. The section ‘Autophagy is required for spermidine-mediated lifespan extension in yeast, flies and worms’ reports that disrupting essential autophagy genes compromises or abolishes that extension in all three. (LLM, conf=0.94)

  cites Eisenberg et al., 2009 source

In the paper

“Dietary supplementation with ω-6 polyunsaturated fatty acids also extends lifespan in nematodes through autophagy activation (O’Rourke et al., 2013).”

What the sources say

• Supported

  The Abstract states that dietary supplementation with fasting-enriched ω-6 PUFAs extends C. elegans lifespan by activating autophagy. The passage discussing chronic supplementation with AA and DGLA reports lifespan extension in well-fed worms and says it depends on autophagy components. (LLM, conf=0.94)

  cites O’Rourke et al., 2013 source

In the paper

“metformin extends lifespan in C. elegans through the induction of a compensatory stress response mediated by AMPK and the master anti-oxidant regulator Nrf2”

What the sources say

• Supported

  The Results section, “AMPK Acts Upstream to Activate SKN-1 Transcriptional Activity” (page not provided), reports that metformin-induced SKN-1 activation depends on AMPK and proposes that oxidative-stress resistance contributes to healthspan extension. The paper identifies SKN-1 as the C. elegans ortholog of Nrf2 and reports that metformin extends median lifespan. (LLM, conf=0.90)

  cites Onken and Driscoll, 2010 source

In the paper

“Notably, rapamycin delays multiple aspects of aging in mice (Wilkinson et al., 2012).”

What the sources say

• Supported

  The Discussion reports that rapamycin-treated mice showed delayed development of several age-related pathologies, including changes in the liver, heart, endometrium, adrenal gland, and tendons, as well as a diminished decline in spontaneous activity. This directly supports the claim that rapamycin delays multiple aspects of aging in mice. (LLM, conf=0.94)

  cites Wilkinson et al., 2012 source

In the paper

“Moreover, there are regulators of age-related proteotoxicity, such as MOAG-4, that act through an alternative pathway distinct from molecular chaperones and proteases (van Ham et al., 2010).”

What the sources say

• Supported

  The Discussion (page not provided) identifies MOAG-4 as a regulator of proteotoxicity and describes its pathway as an alternative to HSF-1-regulated molecular chaperones and proteasomal degradation. The Introduction identifies the proteasome and other proteases as protein-degradation mechanisms, making the citing sentence a fair paraphrase. (LLM, conf=0.88)

  cites van Ham et al., 2010 source

In the paper

“AMPK activation has multiple effects on metabolism and, remarkably, shuts off mTORC1”

What the sources say

• Supported

  The supplied passage [1] (labeled Abstract; no page provided) describes AMPK-mediated inhibition of mTORC1 through TSC2 and direct phosphorylation of raptor. This supports the citing sentence’s paraphrase that AMPK activation shuts off mTORC1. (LLM, conf=0.91)

  cites Alers et al., 2012 source

In the paper

“Dysfunctional mitochondria can contribute to aging independently of ROS, as exemplified by studies with mice deficient in DNA polymerase γ”

What the sources say

• ?Not checked — no full text of the sourcecites Edgar et al., 2009 source
• Supported

  The Introduction describes accelerated aging in mice with a proofreading-deficient DNA polymerase γ. The Discussion reports that these mice do not have increased oxidative stress and proposes respiratory-chain dysfunction, rather than increased ROS, as the primary cause of their sarcopenic phenotype. The finding concerns this mouse model, not a claim that ROS is irrelevant to normal aging. (LLM, conf=0.90)

  cites Hiona et al., 2010 source

In the paper

“Such hormetic reactions may consist in the induction of a mitochondrial stress response either in the same tissue in which mitochondria are defective, or even in distant tissues, as shown in C. elegans”

What the sources say

• Supported

  The Discussion describes mitochondrial stress initiating the UPRmt within a cell and transmitting a signal that induces it in cells without mitochondrial stress. The Results section, “The UPRmt Responds to Cell Non-Autonomous Cues from ETC knockdown,” reports induction in the intestine after neuronal mitochondrial perturbation in C. elegans. Page numbers were not supplied. (LLM, conf=0.92)

  cites Durieux et al., 2011 source

In the paper

“mitochondrial dysfunction may directly impact on cellular signaling and interorganellar crosstalk, by affecting mitochondrion-associated membranes”

What the sources say

• Partly supported

  Section 4, “The interplay of mitochondrial signaling pathways” (page unavailable), describes calcium signals at the ER–mitochondria interface as important to cell function and cell-death responses. It does not say that mitochondrial dysfunction affects mitochondrion-associated membranes or that changes to those membranes mediate an impact on signaling and interorganellar crosstalk. (LLM, conf=0.82)

  cites Raffaello and Rizzuto, 2011 sourceExperimental — accuracy not yet measured

In the paper

“dietary restriction (DR) increases lifespan or healthspan in all investigated eukaryote species, including unicellular and multicellular organisms of several distinct phyla, including non-human primates”

What the sources say

• Partly supported

  The Abstract reports that caloric restriction delays age-associated disease and lowers aging-related mortality in rhesus monkeys, and says it extends lifespan in diverse species. It does not establish the claim for all investigated eukaryote species; the paper also notes that benefits were less overt in two other nonhuman-primate studies. (LLM, conf=0.88)

  cites Colman et al., 2009 sourceExperimental — accuracy not yet measured
• Partly supported

  The Introduction (page unavailable) says dietary restriction extends lifespan in various organisms, including yeast, flies, worms, fish, rodents, and rhesus monkeys. The primate dietary-restriction section also reports fewer age-related deaths and diseases in rhesus monkeys. The paper does not establish the claim’s stronger assertion that this occurs in all investigated eukaryote species. (LLM, conf=0.88)

  cites Fontana et al., 2010 sourceExperimental — accuracy not yet measured
• Partly supported

  The Abstract (page unavailable) says life extension has been reported in a variety of species and describes some health benefits in rhesus monkeys. But it does not establish an increase in lifespan or healthspan in every investigated eukaryote species: the NIA monkeys had no significant survival benefit, and the reported delay in disease onset was only a trend. The Old-onset CR section (page unavailable) also notes possible adverse immune effects. (LLM, conf=0.90)

  cites Mattison et al., 2012 sourceExperimental — accuracy not yet measured

In the paper

“Genetic polymorphisms or mutations that reduce the functions of GH, IGF-1 receptor, insulin receptor or downstream intracellular effectors such as AKT, mTOR and FOXO, have been linked to longevity, both in humans and in model organisms”

What the sources say

• Partly supported

  The Reduced somatotropic signaling section links GH-pathway mutations to longer life in mice and IGF-1 receptor mutations to exceptional longevity in humans. The Attenuated mTOR signaling section links genetic mTOR inhibition to longer life in invertebrates, and the Exceptional human survival section links FOXO3A polymorphisms to longevity. But the paper does not establish reduced FOXO or AKT function as the cause, does not substantiate the insulin-receptor part of the claim, and explicitly says the humans described with GH-receptor mutations did not live longer than controls. No page numbers are available in our copy. (LLM, conf=0.88)

  cites Barzilai et al., 2012 sourceExperimental — accuracy not yet measured
• Partly supported

  The human nutrient-sensing section (page unavailable) links reduced IGF-1 receptor activity to centenarians, and the rodent section reports longer life with GH/IGF-I deficiency and reduced IGF-I receptor expression. The paper also reports lifespan extension from reduced TOR signaling in model organisms. It does not establish longevity from reduced function of every listed component in humans and model organisms: in worms, reduced insulin/IGF-like signaling requires FOXO activity, while deletion of FOXO shortens lifespan in flies. (LLM, conf=0.90)

  cites Fontana et al., 2010 sourceExperimental — accuracy not yet measured
• ?Not checked — no full text of the sourcecites Kenyon, 2010 source

In the paper

“Small molecules may be also employed as pharmacological chaperones to assure the refolding of damaged proteins and to improve age-related phenotypes in model organisms (Calamini et al., 2012).”

What the sources say

• Partly supported

  The Results section, “Suppression of Aggregation and Toxicity in C. elegans” (page unavailable), reports that small-molecule proteostasis regulators reduced age-dependent protein aggregation and restored motility in a disease-model organism. The Abstract and Discussion say the compounds induce cellular chaperone expression and restore protein folding in disease models. They do not establish that the compounds themselves act as pharmacological chaperones directly refolding damaged proteins, or that they improve age-related phenotypes beyond this age-dependent disease model. (LLM, conf=0.87)

  cites Calamini et al., 2012 sourceExperimental — accuracy not yet measured

In the paper

“Remarkably, the IIS pathway is the most conserved aging-controlling pathway in evolution”

What the sources say

• Partly supported

  In “The paradox of IR and aging” (page not provided), the paper says the role of attenuated IIS signaling in aging and longevity is evolutionarily conserved. It does not establish that IIS is the *most* conserved aging-controlling pathway; it also describes mTOR signaling as highly conserved. (LLM, conf=0.88)

  cites Barzilai et al., 2012 sourceExperimental — accuracy not yet measured
• Partly supported

  The Drosophila Nutrient Sensing pathways section states that IIS has an evolutionarily conserved role in aging, and the C. elegans section describes its effect on lifespan. The paper does not establish the stronger claim that IIS is the *most* conserved aging-controlling pathway. (LLM, conf=0.88)

  cites Fontana et al., 2010 sourceExperimental — accuracy not yet measured
• ?Not checked — no full text of the sourcecites Kenyon, 2010 source

In the paper

“In particular, transgenic worms and flies overexpressing chaperones are long-lived (Morrow et al., 2004; Walker and Lithgow, 2003).”

What the sources say

• ?Not checked — no full text of the sourcecites Morrow et al., 2004 source
• Supported

  The Results report that transgenic C. elegans carrying extra copies of the chaperone-encoding hsp-16A locus lived 11% longer than controls at 20 °C. This supports the worm portion of the paired citation; the fly portion is attributed to Morrow et al., not to this paper. (LLM, conf=0.93)

  cites Walker and Lithgow, 2003 source

In the paper

“Genetic analyses indicate that this pathway mediates part of the beneficial effects of DR on longevity in worms and flies”

What the sources say

• Supported

  The Drosophila Dietary Restriction section explicitly says that IIS mediates lifespan extension by dietary restriction. The C. elegans Dietary Restriction section reports that the IIS effector DAF-16 is required for lifespan extension under some, though not all, dietary-restriction methods. Together, these passages support the claim that IIS mediates part of the effect in worms and flies; page numbers were not provided. (LLM, conf=0.92)

  cites Fontana et al., 2010 source

In the paper

“There is evidence indicating that AMPK activation may mediate lifespan-extension following metformin administration to worms and mice”

What the sources say

• Partly supported

  The Discussion (page unavailable) reports that metformin extended the mean lifespan of female SHR mice when treatment began at a young or middle age. It does not identify AMPK activation as a mediator or report lifespan extension in worms; searches for AMPK and worms found no supporting passage. (LLM, conf=0.86)

  cites Anisimov et al., 2011 sourceExperimental — accuracy not yet measured
• Partly supported

  The paper reports that activated AMPK extends lifespan in C. elegans: its results state that a CRTC-1 mutant suppressed lifespan extension in AAK-2-overexpressing worms. It does not report lifespan extension following metformin administration in either worms or mice; metformin appears only in a reference about its therapeutic effects. The cited paper therefore supports the AMPK–worm-longevity link, but not the metformin or mouse parts of the claim. (LLM, conf=0.86)

  cites Mair et al., 2011 sourceExperimental — accuracy not yet measured
• Partly supported

  The Results section, “Metformin-Induced Extended Median Lifespan Requires AMPK” (page unavailable), reports that metformin did not extend median lifespan in C. elegans mutants lacking functional AMPK. The Discussion says metformin activates AMPK in mammalian models, but our copy does not establish that AMPK mediates metformin-induced lifespan extension in mice. (LLM, conf=0.88)

  cites Onken and Driscoll, 2010 sourceExperimental — accuracy not yet measured

In the paper

“it also has undesirable side-effects, such as impaired wound healing, insulin resistance, cataract and testicular degeneration in mice”

What the sources say

• Partly supported

  The Discussion (page unavailable) reports more severe cataracts and a higher incidence of testicular degeneration in rapamycin-treated mice. Our copy does not report impaired wound healing or insulin resistance as side effects; searches for those terms found no supporting passage. (LLM, conf=0.88)

  cites Wilkinson et al., 2012 sourceExperimental — accuracy not yet measured

In the paper

“endurance training and alternate-day-fasting may improve healthspan through their capacity to avoid mitochondrial degeneration”

What the sources say

• ?Not checked — no full text of the sourcecites Castello et al., 2011 source
• Partly supported

  The Abstract reports that endurance exercise prevented mitochondrial dysfunction and premature-aging effects in mtDNA mutator mice, supporting the endurance-training part of the claim. The paper does not report a comparable finding for alternate-day fasting (searched: “alternate-day fasting” and “fasting caloric restriction intermittent alternate day”). (LLM, conf=0.88)

  cites Safdar et al., 2011 sourceExperimental — accuracy not yet measured

In the paper

“Genetically-modified mice with low levels of mTORC1 activity, but normal levels of mTORC2, have increased lifespan”

What the sources say

• Partly supported

  The paper reports increased lifespan in female mtor+/− mlst8+/− mice, alongside reduced hepatic mTORC1 signaling and no significant change in measured mTORC2 signaling (passages 1 and 4). The claim omits the female-specific result: male mice of the same genotype did not live longer. It also describes mTORC2 as having normal levels, whereas the paper says its absolute amount decreased in the females' livers, despite apparently intact signaling. (LLM, conf=0.90)

  cites Lamming et al., 2012 sourceExperimental — accuracy not yet measured

In the paper

“Mouse FOXO1 is required for the tumor suppressive effect of DR”

What the sources say

• Partly supported

  The Longevity and pathology section reports fewer tumors at death in calorie-restricted wild-type mice, but not in calorie-restricted FoxO1 heterozygous mice. The Discussion says the antineoplastic effect was “mostly abrogated” in the heterozygotes. This supports a role for FoxO1, but the study's partial-loss experiment and qualified conclusion do not establish that FOXO1 is strictly required. (LLM, conf=0.84)

  cites Yamaza et al., 2010 sourceExperimental — accuracy not yet measured

In the paper

“The lifespan-extending effect of rapamycin is strictly dependent on the induction of autophagy in yeast, nematodes and flies (Bjedov et al., 2010; Rubinsztein et al., 2011).”

What the sources say

• Partly supported

  The Results report that reducing Atg5 expression completely abrogated rapamycin-mediated life-span extension in flies. The Discussion says similar observations were made for chronological life span in yeast, but its nematode example concerns long-lived IIS mutants, not rapamycin treatment. This source therefore does not establish the claimed dependence across all three organisms. (LLM, conf=0.88)

  cites Bjedov et al., 2010 sourceExperimental — accuracy not yet measured
• ?Not checked — no full text of the sourcecites Rubinsztein et al., 2011 source

In the paper

“increased ROS may prolong lifespan in yeast and C. elegans”

What the sources say

• Partly supported

  The passage labeled Abstract says there is evidence that superoxide can increase life span in C. elegans. The paper does not make the same claim for yeast; its Results and Discussion instead describe reduced ROS production delaying aging in a different fungus. (LLM, conf=0.88)

  cites Doonan et al., 2008 sourceExperimental — accuracy not yet measured
• Supported

  The Discussion reports that previous studies found glucose restriction increased ROS that promoted longevity in both budding yeast and C. elegans. The paper also reports its own finding that elevated hydrogen peroxide, a form of ROS, extends chronological lifespan in yeast. The claim does not present the paper as the original C. elegans study. (LLM, conf=0.93)

  cites Mesquita et al., 2010 source
• Partly supported

  The Results (section ‘Oxidative Damage Is Increased in sod-2 Mutant Worms’) and Discussion (section ‘Increased Longevity through Alteration of Mitochondrial Function’) report increased oxidative damage alongside longer lifespan in C. elegans, but do not establish that increased ROS causes the longevity. The Introduction says that loss of SOD activity in yeast shortens lifespan, so the yeast part is not supported. (LLM, conf=0.88)

  cites Van Raamsdonk and Hekimi, 2009 sourceExperimental — accuracy not yet measured

In the paper

“IIS down-modulation reflects a defensive response aimed at minimizing cell growth and metabolism in the context of systemic damage”

What the sources say

• Partly supported

  In “The link between DNA damage and longevity,” the paper reports systemic GH/IGF1 suppression and reduced oxidative metabolism in DNA-repair-deficient mice. It proposes that these changes are an adaptive response shifting energy from growth toward somatic maintenance, but explicitly calls that interpretation speculative. The claim presents the defensive response as established rather than proposed. (LLM, conf=0.85)

  cites Garinis et al., 2008 sourceExperimental — accuracy not yet measured

In the paper

“manipulations that increase antioxidant defenses do not extend longevity”

What the sources say

• Partly supported

  The Abstract reports that the antioxidant-enzyme overexpression tested in this study did not extend mouse lifespan. But it also reports a 21% lifespan extension when another study targeted catalase to mitochondria, so the unqualified claim about manipulations that increase antioxidant defenses is broader than this paper supports. (LLM, conf=0.88)

  cites Perez et al., 2009 sourceExperimental — accuracy not yet measured

In the paper

“There are also promising examples of genetic manipulations that improve proteostasis and delay aging in mammals (Zhang and Cuervo, 2008).”

What the sources say

• Partly supported

  The paper’s Abstract reports that genetically maintaining chaperone-mediated autophagy in aged mice reduced damaged proteins and improved liver function. It also reports delayed age-dependent changes in the liver’s proteasome system. These findings support improved proteostasis and delayed aspects of liver aging, but not the broader claim that the manipulation delayed aging of the mice as whole organisms. (LLM, conf=0.87)

  cites Zhang and Cuervo, 2008 sourceExperimental — accuracy not yet measured

In the paper

“mice deficient in S6K1 (a main mTORC1 substrate) are also long-lived”

What the sources say

• Partly supported

  The lifespan results (section labeled Abstract; page unavailable) show that S6K1-deficient mice lived longer when both sexes were pooled, but the increase was confined to females; deletion had no lifespan effect in males. The paper identifies S6K1 as a downstream effector of mTOR signaling, but does not specifically call it a main mTORC1 substrate. (LLM, conf=0.88)

  cites Selman et al., 2009 sourceExperimental — accuracy not yet measured

In the paper

“SIRT3 may also directly control the rate of ROS production by deacetylating manganese superoxide dismutase, a major mitochondrial antioxidant enzyme”

What the sources say

• ?Not checked — no full text of the sourcecites Qiu et al., 2010 source
• Partly supported

  The Results section, “Re-expression of Sirt3 deacetylates MnSOD and restores superoxide dismutase activity,” reports that Sirt3 deacetylates MnSOD, increases its activity, and decreases mitochondrial superoxide levels. The Introduction identifies MnSOD as a primary mitochondrial superoxide-scavenging enzyme. These passages support control of ROS levels through scavenging, but do not establish a change in the rate of ROS production. (LLM, conf=0.85)

  cites Tao et al., 2010 sourceExperimental — accuracy not yet measured

In the paper

“SIRT1 and AMPK can engage in a positive feedback loop, thus connecting both sensors of low-energy states into a unified response”

What the sources say

• Supported

  The Discussion describes a dynamic interaction in both directions: AMPK can activate SIRT1, while SIRT1 promotes AMPK activation through LKB1. It also says both respond to nutrient status, supporting the paraphrase of a possible feedback loop between metabolic sensors. The supplied copy does not provide page numbers. (LLM, conf=0.90)

  cites Price et al., 2012 source

In the paper

“genetic manipulations that impair mitochondrial function but do not increase ROS accelerate aging”

What the sources say

• ?Not checked — no full text of the sourcecites Edgar et al., 2009 source
• Partly supported

  The Introduction reports accelerated aging in genetically engineered D257A mice, and the Results report impaired mitochondrial bioenergetics. The Discussion reports decreased mitochondrial ROS production in D257A skeletal muscle, but cautions that ROS production may be tissue-specific. Thus the paper supports the claim for this mouse model, not for genetic manipulations generally or for ROS levels in every tissue. (LLM, conf=0.84)

  cites Hiona et al., 2010 sourceExperimental — accuracy not yet measured
• ?Not checked — no full text of the sourcecites Kujoth et al., 2005 source

In the paper

“trigger inflammatory reactions by favoring ROS-mediated and/or permeabilization-facilitated activation of inflammasomes”

What the sources say

• Supported

  The “Damaging mitochondrial signals in inflammation and cell death” section says mitochondrial ROS can activate the NLRP3 inflammasome and links damaged mitochondria to inflammation. “Autophagy and aging” says removing permeabilized or ROS-producing mitochondria can inhibit NLRP3 activation, supporting both routes in the claim. The supplied passages have no page numbers. (LLM, conf=0.93)

  cites Green et al., 2011 source

In the paper

“metformin retards aging in worms by impairing folate and methionine metabolism of their intestinal microbiome”

What the sources say

• Supported

  The Introduction states that metformin inhibits folate and methionine metabolism in cocultured E. coli, altering worm metabolism and increasing lifespan. The Discussion describes E. coli as acting in some respects as a C. elegans microbiome and reports that metformin slows aging by disrupting bacterial folate metabolism. (LLM, conf=0.90)

  cites Cabreiro et al., 2013 source

In the paper

“The stress-induced synthesis of cytosolic and organelle-specific chaperones is significantly impaired in aging (Calderwood et al., 2009).”

What the sources say

• Partly supported

  Section 3 (page not provided) says the heat shock response wanes with age and cells lose the capacity to activate pathways leading to HSP synthesis; section 9 also reports reduced HSP transcription during aging. These passages support impaired stress-induced chaperone synthesis, but our copy does not establish that the impairment extends specifically to organelle-specific chaperones. (LLM, conf=0.85)

  cites Calderwood et al., 2009 sourceExperimental — accuracy not yet measured

In the paper

“Among the downstream effectors of the IIS pathway, the most relevant one for longevity in worms and flies is the transcription factor FOXO”

What the sources say

• ?Not checked — no full text of the sourcecites Kenyon et al., 1993 source
• Supported

  The Introduction says IIS-mediated lifespan extension in worms is completely dependent on the FOXO transcription factor DAF-16. The Results section, “IIS-mediated longevity requires dFOXO activity” (page not provided), finds that loss of dFOXO almost completely inhibits the longevity of IIS mutants in flies. Together, these passages support FOXO’s central role in IIS-related longevity in both animals. (LLM, conf=0.89)

  cites Slack et al., 2011 source

In the paper

“A prominent aging-associated alteration in intercellular communication is ‘inflammaging’, i.e. a smoldering pro-inflammatory phenotype that accompanies aging in mammals”

What the sources say

• Supported

  The Inflammaging section defines the term as a low-grade pro-inflammatory status appearing during aging and describes a pro-inflammatory phenotype in aged mammals. This supports the attributed description of a smoldering phenotype accompanying mammalian aging. (LLM, conf=0.94)

  cites Salminen et al., 2012 source

In the paper

“inflammatory and stress responses activate NF-κB in the hypothalamus and induce a signaling pathway that results in reduced production of gonadotropin-releasing hormone (GnRH) by neurons”

What the sources say

• Partly supported

  The sections “Hypothalamic microglia in aging development” and “Aging-related hypothalamic GnRH decline induced by NF-κB” (pages unavailable) describe inflammatory TNF-α signaling that can activate neuronal IKKβ/NF-κB, and show that IKKβ/NF-κB activation reduces GnRH expression and release through c-Fos/c-Jun and PKC pathways. The paper does not establish that stress responses initiate this pathway; its Discussion says how hypothalamic IKKβ/NF-κB is activated in the aging process remains a question. (LLM, conf=0.86)

  cites Zhang et al., 2013 sourceExperimental — accuracy not yet measured

In the paper

“genetic and pharmacological inhibition of NF-κB signaling prevents age-associated features in different mouse models of accelerated aging”

What the sources say

• Supported

  The paper’s opening summary states that genetic and pharmacological inhibition of NF-κB signaling prevented age-associated features in two accelerated-aging mouse models, Zmpste24−/− and Lmna G609G/G609G. The Discussion also reports prevention of skin and lymphoid-organ alterations following NF-κB blockade. (LLM, conf=0.95)

  cites Osorio et al., 2012 source
• Partly supported

  The Discussion reports that genetic and pharmacological NF-κB inhibition delayed the onset and reduced the severity of aging-related pathologies; the Results describe these effects chiefly in Ercc1-deficient mice (pages not provided). The claim overstates the finding as prevention and implies evidence across different accelerated-aging mouse models. (LLM, conf=0.87)

  cites Tilstra et al., 2012 sourceExperimental — accuracy not yet measured

In the paper

“A recent meta-analysis of more than 300 genome wide association studies (GWAS) identified the INK4a/ARF locus as the genomic locus that is genetically linked to the highest number of age-associated pathologies, including several types of cardiovascular diseases, diabetes, glaucoma, and Alzheimer’s disease”

What the sources say

• Partly supported

  Split into 2 atoms — 0 confirmed, 2 partially supported, 0 disputed, 0 misattributed, 0 unverifiable. Expand the claim to see per-atom verdicts.

  cites Jeck et al., 2012 sourceExperimental — accuracy not yet measured

In the paper

“elimination of senescent cells in an experimental progeria model delays age-related pathologies”

What the sources say

• Supported

  The main text (Figs. 2–3; page not specified) reports that clearing p16Ink4a-positive senescent cells in BubR1 progeroid mice delayed cataracts, muscle decline and fat loss. The effect was selective to pathologies associated with p16Ink4a induction, consistent with the claim. (LLM, conf=0.94)

  cites Baker et al., 2011 source

In the paper

“reduction of SIRT1 levels correlates with the development and progression of many inflammatory diseases”

What the sources say

• Partly supported

  The Results (Fig. 6; page unavailable) report an inverse correlation between SirT1 expression and macrophage markers in human adipose tissue. The Conclusions (page unavailable) link reduced SirT1 to adipose tissue inflammation during overnutrition. The paper does not establish a correlation with the development or progression of many inflammatory diseases; that extends beyond the condition studied. (LLM, conf=0.88)

  cites Gillum et al., 2011 sourceExperimental — accuracy not yet measured
• Partly supported

  The Introduction reports reduced SIRT1 in the lungs of patients with COPD, and the Discussion links SIRT1 deficiency to worsened emphysema in mice. These passages concern COPD/emphysema; they do not establish a correlation between reduced SIRT1 and the development and progression of many inflammatory diseases. Page numbers are unavailable in our copy. (LLM, conf=0.87)

  cites Yao et al., 2012 sourceExperimental — accuracy not yet measured
• Partly supported

  The Discussion reports that endotoxin-induced systemic inflammation caused a robust decrease in SIRT1 expression in mouse liver. It only speculates that similar metabolic perturbations may contribute to many diseases; it does not establish a correlation between reduced SIRT1 and the development or progression of many inflammatory diseases. (LLM, conf=0.88)

  cites Zhang et al., 2010 sourceExperimental — accuracy not yet measured

In the paper

“There are several possibilities for restoring defective intercellular communication underlying aging processes, including genetic, nutritional or pharmacological interventions that may improve the cell-cell communication properties that are lost with aging (Freije and Lopez-Otin, 2012; Rando and Chang, 2012).”

What the sources say

• ?Not checked — no full text of the sourcecites Freije and Lopez-Otin, 2012 source
• Partly supported

  In “Rejuvenation without Dedifferentiation” (page unavailable), the paper describes age-related changes in signaling pathways and suggests that a youthful systemic milieu can rejuvenate aged cells. It also discusses genetic and pharmacological rejuvenation, but does not establish that genetic, nutritional, and pharmacological interventions each restore cell-cell communication lost with aging. (LLM, conf=0.84)

  cites Rando and Chang, 2012 sourceExperimental — accuracy not yet measured

In the paper

“Conversely, lifespan-extending manipulations targeting one single tissue can retard the aging process in other tissues (Durieux et al., 2011; Lavasani et al., 2012; Tomas-Loba et al., 2008).”

What the sources say

• Supported

  The Results section, “cco-1 Functions in Specific Tissues to Affect the Aging Process” (page unavailable), reports that ETC knockdown confined to the intestine or neurons increased C. elegans lifespan. Another Results section, “The UPRmt Responds to Cell Non-Autonomous Cues from ETC knockdown” (page unavailable), shows that neuronal knockdown induced a mitochondrial stress response in the intestine, supporting an effect in a different tissue. The finding concerns these particular tissues and manipulation, not every tissue-specific intervention. (LLM, conf=0.90)

  cites Durieux et al., 2011 source
• Partly supported

  The Results report that intraperitoneal administration of muscle-derived stem/progenitor cells extended lifespan in progeroid mice, and the Discussion reports effects in brain and muscle where donor cells were not detected. This supports effects across tissues, but the lifespan-extending treatment was administered systemically, not targeted to a single tissue. (LLM, conf=0.86)

  cites Lavasani et al., 2012 sourceExperimental — accuracy not yet measured
• ?Not checked — no full text of the sourcecites Tomas-Loba et al., 2008 source

In the paper

“aging also involves changes at the level of intercellular communication, be it endocrine, neuroendocrine or neuronal”

What the sources say

• ?Could not verify

  The section “Implication of mTOR signaling in the aging process” discusses mTOR, longevity, and age-related disease, but does not say that aging changes intercellular communication. Searches for “intercellular communication” and endocrine, neuroendocrine, or neuronal communication did not locate a passage addressing that point. (LLM, conf=0.75)

  cites Laplante and Sabatini, 2012 sourceExperimental — accuracy not yet measured
• Partly supported

  The “Rejuvenation without Dedifferentiation” section links aging to changes in systemic signaling pathways and circulating chemokines and cytokines. That supports the broad point that communication between cells changes with age, but the passages do not establish the claim’s specific endocrine, neuroendocrine, and neuronal categories. (LLM, conf=0.84)

  cites Rando and Chang, 2012 sourceExperimental — accuracy not yet measured
• ?Not checked — no full text of the sourcecites Russell and Kahn, 2007 source

In the paper

“parabiosis experiments have demonstrated that the decline in neural and muscle stem cell function in old mice can be reversed by systemic factors from young mice”

What the sources say

• ?Not checked — no full text of the sourcecites Conboy et al., 2005 source
• Partly supported

  The parabiosis results (section labeled Abstract; page not given) show increased neural progenitors and newly born neurons in old mice paired with young mice, supporting the neural part of the claim. Our copy does not report a corresponding result for muscle stem cells (searched: muscle, muscle stem cells). (LLM, conf=0.88)

  cites Villeda et al., 2011 sourceExperimental — accuracy not yet measured

In the paper

“pharmacologic activation of SIRT1 may prevent inflammatory responses in mice”

What the sources say

• Partly supported

  The Results section reports that genetic SirT1 overexpression reduced high-fat-diet-induced adipose tissue inflammation in mice. It does not establish that pharmacologic activation has this effect; the paper also cautions that polyphenols used to modify SirT1 function are not direct activators. Its findings are specific to the high-fat-diet setting, while SirT1-overexpressing mice on regular chow showed elevated inflammatory markers. Page numbers are unavailable in our copy. (LLM, conf=0.88)

  cites Gillum et al., 2011 sourceExperimental — accuracy not yet measured
• Supported

  The Results report that SRT1720, a pharmacological SIRT1 activator, significantly reduced neutrophil influx in mice after cigarette-smoke or elastase exposure. This supports the hedged claim that pharmacologic SIRT1 activation may prevent inflammatory responses in mice under those conditions. (LLM, conf=0.91)

  cites Yao et al., 2012 source
• Partly supported

  The Results section reports that resveratrol pretreatment prevented several endotoxin-induced changes in mice, including ATP decline and increased autophagy and HIF-1α expression; these protective effects depended on SIRT1. It does not show that resveratrol prevented the inflammatory response itself or establish that its effect came from direct pharmacologic activation of SIRT1. (LLM, conf=0.84)

  cites Zhang et al., 2010 sourceExperimental — accuracy not yet measured

In the paper

“The microenvironment contributes to the age-related functional defects of CD4 T cells, as assessed by using an adoptive transfer model in mice (Lefebvre et al., 2012).”

What the sources say

• Supported

  The Introduction describes an adoptive-transfer model comparing young CD4 T cells in young and aged mouse hosts and reports functional defects in the aged hosts. The Discussion concludes that the aged environment significantly contributes to impaired CD4 T-cell responses. Page numbers are not provided in our copy. (LLM, conf=0.94)

  cites Lefebvre et al., 2012 source

In the paper

“in the case of Drosophila intestinal stem cells, where excessive proliferation leads to exhaustion and premature aging”

What the sources say

• Partly supported

  The Results section, “dPGC-1 modulates tissue homeostasis in the aged intestine” (page unavailable), says aging or stress increases intestinal stem-cell proliferation, accompanied by mis-differentiated cells and deterioration of the gut epithelium. It does not report stem-cell exhaustion or establish that excessive proliferation causes premature aging; it describes aging or stress as preceding the increased proliferation. (LLM, conf=0.87)

  cites Rera et al., 2011 sourceExperimental — accuracy not yet measured

In the paper

“p21-null mice, which present premature exhaustion of HSCs and neural stem cells”

What the sources say

• ?Not checked — no full text of the sourcecites Cheng et al., 2000 source
• Partly supported

  The section “Loss of p21 exhausts NSC self-renewal” reports an accelerated decline of neural stem cells in aging p21-null mice and exhaustion of their self-renewal in vitro. The paper also reports reduced repopulation capacity of p21-null hematopoietic stem cells, but only following prior expansion; it does not establish premature HSC exhaustion in the mice without that condition. Page numbers were unavailable in our copy. (LLM, conf=0.85)

  cites Kippin et al., 2005 sourceExperimental — accuracy not yet measured

In the paper

“the mRNA decay factor AUF1, which is implicated in the cessation of the inflammatory response by mediating cytokine mRNA degradation”

What the sources say

• Supported

  The Introduction describes AUF1 as an attenuator of the inflammatory cytokine response that destabilizes cytokine mRNAs. It also reports that AUF1-deficient mice cannot properly degrade key inflammatory cytokine mRNAs, supporting the attributed role in bringing the response to an end. (LLM, conf=0.94)

  cites Pont et al., 2012 source

In the paper

“although resveratrol does not extend mouse lifespan under normal dietary conditions”

What the sources say

• Supported

  The Results (Survival) state that resveratrol did not increase overall survival or maximum lifespan in mice fed a standard diet. The study began treatment at one year of age, so the finding concerns treatment started in mid-life. (LLM, conf=0.93)

  cites Pearson et al., 2008 source
• Supported

  The Discussion reports that resveratrol did not extend lifespan in mice fed control diets and that the present study found no effect when treatment began at 4 months. It contrasts those findings with lifespan extension in mice on very high-fat diets. (LLM, conf=0.93)

  cites Strong et al., 2012 source

In the paper

“Recent promising studies suggest that stem cell rejuvenation may reverse the aging phenotype at the organismal level”

What the sources say

• Partly supported

  In “Rejuvenation without Dedifferentiation” (page unavailable), the review reports that aged stem cells regained youthful features and that telomerase reactivation reversed degenerative pathologies in multiple organs. Its “Concluding Remarks” (page unavailable) suggest a possible link between stem-cell biology and organismal longevity, but do not establish reversal of the aging phenotype at the organismal level. (LLM, conf=0.85)

  cites Rando and Chang, 2012 sourceExperimental — accuracy not yet measured

In the paper

“Paralleling inflammaging, the function of the adaptive immune system declines”

What the sources say

• Supported

  In “Aging of the Immune System (Immunosenescence),” the paper describes age-related changes in T cells, including fewer naïve T cells and reduced proliferative potential, and says most of these changes pertain to the adaptive immune system. The “Biology of Aging” section also identifies loss of immunologic function as immunosenescence. (LLM, conf=0.93)

  cites Deeks, 2011 source