FoxOs Cooperatively Regulate Diverse Pathways Governing Neural Stem Cell Homeostasis
Open accessAbstract
The PI3K-AKT-FoxO pathway is integral to lifespan regulation in lower organisms and essential for the stability of long-lived cells in mammals. Here, we report the impact of combined FoxO1, 3, and 4 deficiencies on mammalian brain physiology with a particular emphasis on the study of the neural stem/progenitor cell (NSC) pool. We show that the FoxO family plays a prominent role in NSC proliferation and renewal. FoxO-deficient mice show initial increased brain size and proliferation of neural progenitor cells during early postnatal life, followed by precocious significant decline in the NSC pool and accompanying neurogenesis in adult brains. Mechanistically, integrated transcriptomic, promoter, and functional analyses of FoxO-deficient NSC cultures identified direct gene targets with known links to the regulation of human brain size and the control of cellular proliferation, differentiation, and oxidative defense. Thus, the FoxO family coordinately regulates diverse genes and pathways to govern key aspects of NSC homeostasis in the mammalian brain.
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- Findingown data
Integrated analyses confirmed 8 bona fide novel FoxO direct targets: ASPM, TMEFF2, SIRT2, KITL, TSPAN7, sFRP1/2, and SOST.
“these integrated analyses and highly stringent criteria confirmed 8 bona fide novel FoxO direct targets (ASPM, TMEFF2, SIRT2, KITL, TSPAN7, sFRP1/2, and SOST)”
Quote in the paperSubstantial claim - Findingown data
Knowledge-based pathway analysis showed convergent regulation of FoxO networks such as IGF-1/PI3K/PTEN, cell cycle, and metabolic pathways.
“knowledge-based pathway analysis showed convergent regulation of well-known FoxO networks such as IGF-1/PI3K/PTEN, cell cycle and metabolic pathways”
Quote in the paperSubstantial claim - Findingown data
Early passage (P2) FoxO null NSC cultures have increased proliferation as measured by Ki67 expression and population doubling.
“Ki67 expression (Figure 1D) and population doubling (Figure 4A) in NSC cultures revealed that early passage (P2) FoxO null NSC cultures had increased proliferation.”
Quote in the paperSubstantial claim - Findingown data
Transcriptomic analysis of multiple independent FoxO WT and null early passage neurosphere cultures revealed differential regulation of 3425 genes by FoxOs using two independent statistical methods.
“Transcriptomic analysis of multiple independent FoxO WT and null early passage neurosphere cultures revealed differential regulation of 3425 genes by FoxOs as determined by two independent statistical methods”
Quote in the paperSubstantial claim - Findingown data
15-week-old FoxO null brains show a significant 25% decline in Sox2-positive cells in the SVZ (1 vs 0.757, p=0.004).
“15 week-old FoxO null brain shows a significant 25% decline in Sox2-positive cells in the SVZ (Figure 2A; gray bars, 1 vs 0.757, p=0.004).”
Quote in the paperSubstantial claim
- Findingown data
At postnatal day 10, the number of neurons and glia is increased in the cerebral cortex of FoxO null brains (NeuN+ 4486 vs 5024; S100+ 301 vs 402, p<0.1).
“At 10 days postnatally, the number of both neurons and glia increased in cerebral cortex of FoxO null brain (NeuN+, 4486 vs 5024; S100+, 301 vs 402, p<0.1)”
Quote in the paperSubstantial claim - Findingown data
Cultured cells from adult FoxO null mice (18-22 weeks) form secondary multipotent neurospheres at a lower percentage than WT controls (3.6% vs 1.3%).
“The percentage of cultured cells from adult FoxO null mice (18-22 week-old) capable of forming secondary multipotent neurospheres was lower than cells derived from WT littermate controls (Figure 2C; 3.6% vs 1.3%).”
Quote in the paperSubstantial claim - Findingown data
FoxO3 exerts the greatest phenotypic impact on brain size among FoxO genotypes in conditional and germline knockout mice.
“Notably across all of the genotypes, FoxO3 exerts the greatest phenotypic impact on brain size as observed in both conditional and germline knockout mice”
Quote in the paperSubstantial claim - Findingown data
In embryonic brain at E15.5, FoxO1 and FoxO3 have broad, partially overlapping expression in the NSC-rich ventricular zone.
“In the embryonic brain (E15.5), FoxO1 and 3 also had broad and partially overlapping patterns of expression particularly within the NSC-rich ventricular zone (VZ).”
Quote in the paperSubstantial claim - Findingown data
FoxO null brains show a decline in newborn neurons in the olfactory bulb below WT levels (1.76% vs 0.92%, p=0.018).
“a decline in the number of newborn neurons in the olfactory bulb to numbers below those in FoxO WT brains (1.76% vs 0.92%, p=0.018, Supplemental Figure S4c)”
Quote in the paperSubstantial claim - Findingown data
No apparent developmental abnormalities or alterations in brain cytoarchitecture are present before 3 weeks of age in any FoxO genotype combination.
“Histological inspection showed no apparent developmental abnormalities or alterations in brain cytoarchitecture prior to early adulthood (3 weeks of age) in any of the genotype combinations”
Quote in the paperSubstantial claim - Findingown data
ASPM shRNA knockdown with two independent hairpins profoundly decreases proliferation of FoxO null NSC (BrdU 0.41 vs 0.06 and 0.11, p<0.01).
“ASPM shRNA-mediated knockdown (two independent hairpins) resulted in a profound decrease in proliferation of FoxO null NSC (Figure 5E, F, and G; 0.41 vs 0.06 and 0.11 for BrdU incorporation, p<0.01).”
Quote in the paperSubstantial claim - Findingown data
The NSC FoxO transcriptome shows minimal overlap with other cell types including HSCs.
“the NSC FoxO transcriptome demonstrates minimal overlap with other cell types including HSCs”
Quote in the paperNot a substantial claim - Findingown data
Among differentially regulated genes are known FoxO effectors and family members (Cyclin D1, Id1/2, Plk2).
“Among these are known effectors of FoxO and their family members (e.g., Cyclin D1, Inhibitor of DNA binding 1 and 2, and Polo like kinase 2)”
Quote in the paperNot a substantial claim - Findingown data
In the NSC-rich SVZ of young FoxO null brains, there is a prominent increase in cell cycle re-entry among BrdU-labeled cells (Ki67/BrdU/Sox2 triple-positive; 18.85% vs 10.82%, p<0.01).
“A prominent increase in cell cycle re-entry (i.e., Ki67/BrdU/Sox2 triple-positive cells) among BrdU-labeled population was evident in the NSC-rich regions of the SVZ in FoxO null brain (Figure 1C; 18.85% vs 10.82%, p<0.01).”
Quote in the paperSubstantial claim - Findingown data
FoxO null embryonic brains show increased ASPM protein and mRNA in NSC-rich regions.
“increased ASPM protein and mRNA in NSC-rich regions of FoxO null embryonic brains”
Quote in the paperSubstantial claim - Findingown data
FoxO null NSC show significantly increased ASPM mRNA levels by RT-qPCR.
“we observed (i) significantly increased ASPM mRNA levels in FoxO null NSC by RT-qPCR”
Quote in the paperSubstantial claim - Findingown data
FoxO1 and FoxO3 are broadly expressed in adult mouse brain neurons, astrocytes, and oligodendrocytes.
“Immunohistochemical analysis of wild type adult mouse brain shows that FoxO 1 and 3 are broadly expressed in multiple cell types including neurons (NeuN+), astrocytes (GFAP+), and oligodendrocytes (Olig2+)”
Quote in the paperSubstantial claim - Findingown data
Increased expression of cyclins and CDKs and decreased p57KIP2 correlate with short-term hyper-proliferation phenotype in FoxO null NSC.
“there is increased expression of cyclins (Ccn A2, B1, B2, C, D1, D3, E1 G1, T2), cyclin dependent kinases (Cdk 2, 4, 7), and decrease in specific cyclin dependent kinase inhibitors (p57KIP2) which correlate well with observed short-term hyper-proliferation phenotype in FoxO null NSC”
Quote in the paperSubstantial claim - Findingown data
The FoxO NSC transcriptome shows dysregulation of a distinct set of ROS detoxifying enzymes including peroxiredoxin, glutathione peroxidase1, and sestrin3 (SESN3), unlike the HSC findings.
“the FoxO NSC transcriptome instead shows prominent dysregulation of a distinct set of ROS detoxifying enzymes including peroxiredoxin, glutathione peroxidase1, and sestrin3 (SESN3)”
Quote in the paperSubstantial claim - Findingown data
In silico promoter analysis identified evolutionarily conserved FoxO consensus binding elements in regulatory regions of 96 of the top 186 differentially expressed genes.
“96 of the 186 genes were found to contain putative conserved FoxO BEs”
Quote in the paperSubstantial claim - Findingown data
Intracellular ROS levels are increased in FoxO null NSC relative to WT control cultures (mean intensity 2904 vs 533).
“the DCF-DA ROS measurement assay, which showed an increase in intracellular ROS levels in FoxO null NSC relative to WT control cultures (Figure 3A; mean intensity level of 2904 vs 533).”
Quote in the paperSubstantial claim - Findingown data
FoxO mRNA and proteins are highly expressed in NSC-containing neurospheres cultured from embryonic and postnatal brains.
“we also detected high level expression of FoxO mRNA and proteins in NSC-containing neurospheres cultured from embryonic and postnatal brains”
Quote in the paperSubstantial claim - Findingcitation
Evolutionarily conserved FoxO binding elements in the ASPM promoter bind FoxO by ChIP in NSC.
“in silico methods (Paik et al., 2007) identified evolutionarily conserved FoxO BEs in the ASPM promoter which were confirmed to bind FoxO by ChIP assay in NSC”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Paik et al., 2007 source
Not checked in the free run.
- Findingown data
FoxO null NSC cultures show increased ASPM-positive cells.
“increased ASPM-positive cells in FoxO null NSC cultures”
Quote in the paperSubstantial claim - Findingown data
At approximately 15 weeks of age, mild ventricular enlargement becomes obvious in all three FoxO-deficient brains.
“At approximately 15 weeks of age, mild ventricular enlargement became obvious in all three FoxO-deficient brains”
Quote in the paperSubstantial claim - Findingown data
FoxO1 and FoxO3 are highly expressed in Sox2-positive multipotent progenitors of the SVZ and SGZ.
“we documented high levels of FoxO1 and 3 expression in the multipotent progenitors (Sox2+) of the SVZ in the forebrain and the SGZ in the hippocampus”
Quote in the paperSubstantial claim - Findingown data
In vivo NAC administration does not suppress increased cycling of Sox2+ cells in postnatal FoxO null brains (21.3% vs 18.9%, p>0.05).
“in vivo administration of NAC did not suppress increased cycling of Sox2+ cells in postnatal FoxO null brains (Figure 4C; NAC vs PBS, 21.3% vs 18.9%, p>0.05)”
Quote in the paperSubstantial claim - Findingown data
hGFAP-Cre:FoxO1/3L/L mice have significantly increased overall brain size and weight compared with hGFAP-Cre-negative controls at 12 weeks.
“FoxO1/3L/L allelic combinations with hGFAP-Cre showed significantly increased overall brain size (i.e. thickness of cortices and corpus callosum) and weight relative to hGFAP-Cre negative controls that was evident at 12 weeks of age”
Quote in the paperSubstantial claim - Findingreasoning
hGFAP-Cre:FoxO4L/L mice, alone or in triple knockout, show minimal effect on brain size.
“hGFAP-Cre:FoxO4L/L mice, alone or in the triple knockout, exhibited a minimal effect on brain size consistent with its low expression”
Quote in the paperSubstantial claim - Findingown data
Soma size of neurons or astrocytes is unchanged in FoxO null brains.
“detailed morphometric analyses showed no change in the soma size of neurons or astrocytes in FoxO null brains”
Quote in the paperSubstantial claim - Findingown data
Combined FoxO1 and FoxO3 deficiency has a more pronounced effect on brain size than individual FoxO1 or FoxO3 deficiency in the context of FoxO4 deficiency.
“combined FoxO1 and 3 deficiencies (hGFAP-Cre: FoxO1/3/4L/L) had a more pronounced effect on brain size than individual FoxO1 or FoxO3 deficiency in the context of FoxO4 deficiency”
Quote in the paperSubstantial claim - Findingown data
Exogenous Wnt3a treatment can induce a strong proliferative response in neural stem cells.
“Exogenous Wnt3a treatment can induce a strong proliferative response in NSC”
Quote in the paperSubstantial claim - Findingown data
ASPM is one of the major targets of FoxOs.
“Our findings that ASPM is one of the major targets of FoxOs”
Quote in the paperSubstantial claim - Findingown data
FoxO null neural stem/progenitor proliferation does not show sustained increased proliferation, distinguishing it from PTEN null neural stem cells.
“the FoxO null NSC/progenitor proliferation is distinct from that of PTEN null NSC in that it does not show sustained increased proliferation.”
Quote in the paperSubstantial claim - Findingown data
Canonical Wnt reporter response is reproducibly enhanced in FoxO null NSC.
“This response is reproducibly enhanced in FoxO null NSC”
Quote in the paperSubstantial claim - Findingown data
sFRP1/2 and SOST are direct targets of FoxOs.
“Our identification of sFRP1/2 and SOST as direct targets of FoxOs”
Quote in the paperSubstantial claim - Findingown data
The increase in Wnt3a-induced reporter activity caused by combined sFRP1/2 and SOST knockdown was completely reversed by adding recombinant sFRP1/2 and SOST.
“this increase was completely reversed by the addition of recombinant sFRP1/2 and SOST (Supplemental Figure S7b and Figure 6E).”
Quote in the paperSubstantial claim - Findingown data
sFRP1, sFRP2, and SOST are significantly downregulated in FoxO null NSC transcriptome.
“there was significant downregulation of soluble frizzled receptors (sFRP) 1 and 2 as well as sclerostin (SOST) in FoxO null NSC transcriptome”
Quote in the paperSubstantial claim - Findingown data
Conserved ChIP-validated FoxO binding elements are present in promoters of sFRP1/2 and SOST.
“the presence of conserved ChIP-validated FoxO binding elements in their promoters”
Quote in the paperSubstantial claim - Findingown data
Knockdown of ASPM limits expansion of FoxO null neural stem cell cultures.
“its knockdown limits expansion of the FoxO null NSC cultures”
Quote in the paperSubstantial claim - Findingown data
Neuron-specific deletion of FoxOs (Syn-Cre: FoxO1/3/4L/L) is not accompanied by neural stem cell abnormalities.
“neuron-specific deletion of FoxOs (Syn-Cre: FoxO1/3/4L/L) is not accompanied by NSC abnormalities (data not shown).”
Quote in the paperSubstantial claim - Findingown data
Enforced expression of CA-FoxO1 or 3 suppresses Wnt reporter activity in NSC.
“enforced expression of CA-FoxO1 or 3 suppressed reporter activity (i.e., dampened Wnt signaling)”
Quote in the paperSubstantial claim - Findingown data
sFRP1/2 and SOST mRNA expression is higher in FoxO WT than FoxO null NSC.
“the link between FoxO status and these factors was confirmed by their higher mRNA expression in FoxO WT relative to FoxO null NSC”
Quote in the paperSubstantial claim - Findingown data
The FoxO transcriptome is notable for regulatory factors of the Wnt pathway.
“The FoxO transcriptome is also notable for regulatory factors of the Wnt pathway, a pathway whose stringent control is required for the long-term homeostasis of many tissue stem cells.”
Quote in the paperSubstantial claim - Findingown data
Enhanced Wnt pathway activity in FoxO null neural stem cells leads to an acute short-term increase in their proliferation.
“enhanced Wnt pathway activity in FoxO null NSC leads to an acute short-term increase in their proliferation.”
Quote in the paperSubstantial claim - Findingown data
Disruption of FoxO-dependent homeostatic processes in the mouse brain leads to initial deregulated neural stem cell proliferation followed by a decline in the neural stem cell pool and accompanying neurogenesis that is only evident in adult mice.
“Disruption of these FoxO-dependent homeostatic processes in the mouse brain leads to initial deregulated NSC proliferation followed by a decline in NSC pool and accompanying neurogenesis that is only evident in adult mice.”
Quote in the paperSubstantial claim - Findingown data
Knockdown of individual sFRP1/2 or SOST factors did not appreciably change Wnt3a-induced reporter activity.
“Knockdown of individual factors did not cause appreciable differences in Wnt3a-induced reporter activity (data not shown)”
Quote in the paperSubstantial claim - Findingown data
Enforced expression of CA-FoxO1 or 3 induces expression of sFRP1/2 and SOST in FoxO null NSC.
“enforced expression of constitutively active (CA)-FoxO1 or 3 can induce expression of sFRP1/2 and SOST in FoxO null NSC”
Quote in the paperSubstantial claim - Findingown data
Single and double FoxO null brains show overtly normal patterns of neurogenesis through mid-adulthood.
“the single and double FoxO null brains show overtly normal patterns of neurogenesis through mid-adulthood (Muller and DePinho, unpublished observations).”
Quote in the paperSubstantial claim - Findingown data
In FoxO null neural stem cells, Wnt signaling target genes Cyclin D2 and Myc were upregulated.
“the expression of the targets dependent on Wnt signaling including Cyclin D2 and Myc were upregulated in FoxO null NSC (Supplemental Figure S7a).”
Quote in the paperSubstantial claim - Findingown data
Addition of sFRP1/2 and SOST significantly inhibited the increased basal proliferation in FoxO null and knockdown neural stem cells.
“which was significantly inhibited by the addition of sFRP1/2 and SOST (Figure 6F).”
Quote in the paperSubstantial claim - Findingown data
ASPM is a direct target of FoxOs in neural stem cells.
“the finding of ASPM as a direct target of FoxOs in NSC”
Quote in the paperSubstantial claim - Findingown data
Expression of Wnt signaling targets including Cyclin D2 and Myc is upregulated in FoxO null NSC.
“the expression of the targets dependent on Wnt signaling including Cyclin D2 and Myc were upregulated in FoxO null NSC”
Quote in the paperSubstantial claim - Findingcitation
The FoxO null transcriptome shows changes in key developmental regulators.
“the FoxO null transcriptome shows changes of key developmental regulators (Paik and DePinho, unpublished)”
Quote in the paperNot a substantial claim - Interpretationown data
FoxO NSC transcriptome and pathway analyses show alterations in proliferation and differentiation networks that may explain enlarged brain phenotype and abnormal cycling leading to NSC exhaustion.
“The FoxO NSC transcriptome and pathway analyses were notable for alterations in proliferation and differentiation networks, the imbalance of which may provide an explanation for the enlarged brain phenotype and the abnormal cycling that could ultimately lead to exhaustion of NSC.”
Quote in the paperSubstantial claim - Study design and conductown data
hGFAP-Cre:FoxO1/3/4L/L mice show nearly complete FoxO deletion in NSC-rich adult brain regions including the SVZ.
“nearly complete deletion of FoxO was observed in NSC-rich regions of adult brain, including SVZ, in hGFAP-Cre: FoxO1/3/4L/L mice”
Quote in the paperSubstantial claim - Premisecitation
Deletion of FoxO3 alone in the brain via Nestin-Cre produces a similar decline in NSC number in vivo and in vitro.
“an accompanying article shows that deletion of FoxO3 alone in the brain via an independent Cre-deletor transgenic line, Nestin-Cre, which allows deletion in NSC (as well as other cell type, also produces similar decline in NSC number both in vivo and in vitro (Renault et al.).”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Renault et al.
Not checked in the free run.
- Interpretationown data
Lack of complete rescue of self-renewal defects with ROS normalization points to additional FoxO-regulated pathways governing NSC biology.
“The lack of complete rescue of the self-renewal defects, even with normalization of ROS by NAC treatment, pointed to additional FoxO regulated pathways governing NSC biology.”
Quote in the paperSubstantial claim - Interpretationown data
Loss of FoxO function in embryonic and adult brain together most prominently impacts processes controlling size and function of the NSC pool in postnatal mouse brain.
“suggesting that the loss of FoxO function in the embryonic and adult brain together impacts most prominently processes controlling the size and function of NSC pool in postnatal mouse brain”
Quote in the paperSubstantial claim - Study design and conductown data
FoxO deletion is nearly complete in Sox2-, NeuN-, GFAP-, and Olig2-positive cell types in FoxO null brains, except in a few anatomical regions.
“FoxO deletion was nearly complete in Sox2, NeuN, GFAP, or Olig2 positive cell types in the FoxO null brain with the exception of a few anatomical regions”
Quote in the paperSubstantial claim - Interpretationown data
ASPM is a physiologically relevant target of FoxO in regulating NSC proliferation and renewal.
“Thus, ASPM is a physiologically relevant target of FoxO in the regulation of proliferation and the renewal of NSC.”
Quote in the paperSubstantial claim - Interpretationreasoning
These processes collectively fine-tune the balance of growth, survival and differentiation needed to achieve regulation of neural stem cells throughout life.
“which collectively serve to fine tune the balance of growth, survival and differentiation needed to achieve the regulation of NSC throughout life (Figure 7).”
Quote in the paperSubstantial claim - Interpretationown data
De-repression of ASPM in FoxO null NSC contributes to short-term hyper-proliferative defects and enlarged brain phenotype.
“We propose that the de-repression of ASPM in FoxO null NSC contributes to the observed short-term hyper-proliferative defects in this progenitor compartment and the enlarged brain phenotype.”
Quote in the paperSubstantial claim - Interpretationcitation
FoxO3 has a dominant role relative to other FoxO family members in the brain.
“a result suggesting a dominant role of FoxO3 relative to other FoxO family member in the brain.”
Quote in the paperSubstantial claim - Premisecitation
Lack of FoxO3 alone in the brain is sufficient to cause a defect in neural stem cell number in vivo.
“accompanying study by Renault et al. demonstrates that lack of FoxO3 alone in the brain is sufficient to cause a defect in NSC number in vivo”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites Renault et al.
Not checked in the free run.
- Interpretationown data
FoxOs engage the Wnt pathway on many levels to ensure tight regulation of neural stem cells.
“we establish that FoxOs engage the Wnt pathway on many levels to ensure a tight regulation of NSC.”
Quote in the paperSubstantial claim- Rests on an assumption: Wnt signaling is essential for tissue stem cell renewal.
- Interpretationown data
FoxOs have conserved roles across different stem cell compartments via regulation of distinct lineage-specific sets of genes governing proliferation and intracellular ROS levels.
“FoxOs have conserved roles across different stem cell compartments via regulation of distinct lineage-specific sets of genes governing proliferation and intracellular ROS levels.”
Quote in the paperSubstantial claim - Interpretationown data
FoxOs are essential regulators of genes governing processes central to neural stem cell biology.
“an integrated molecular, cellular and organismal analysis has established FoxOs as essential regulators of genes governing processes central to NSC biology (Figure 7).”
Quote in the paperSubstantial claim - Interpretationown data
FoxOs regulate neural stem cell cellular responses to extracellular signals via coordinated regulation of specific target genes.
“supports the view that the FoxOs regulate NSC cellular responses to the extracellular signals via a coordinated regulation of specific target genes.”
Quote in the paperSubstantial claim - Interpretationreasoning
FoxOs regulate many cellular processes that require fine regulation to maintain the right balance of proliferation, survival and cell fate commitment decisions in tissue stem cell pools.
“the FoxOs appear to regulate many cellular processes that require fine regulation to maintain the right balance of proliferation, survival and cell fate commitment decisions in tissue stem cell pools”
Quote in the paperSubstantial claim - Interpretationown data
FoxOs are important regulators of neural stem cell function and renewal under physiological conditions in the brain.
“indicates that FoxOs are important regulators of NSC function and renewal under physiological conditions in the brain.”
Quote in the paperSubstantial claim - Interpretationown data
FoxO directly executes complex actions on neural stem cells and brain physiology through a diverse set of direct functional targets and linked pathways.
“a combined transcriptomic, computational, and biochemical analyses have identified a diverse set of direct functional targets and linked pathways through which FoxO directly executes its complex actions on NSC and brain physiology.”
Quote in the paperSubstantial claim - Interpretationreasoning
ASPM contributes to the increased FoxO null brain size phenotype via its known activities in controlling neural progenitor cell biology.
“suggests that ASPM contributes to increased FoxO null brain size phenotype via its known activities in the control of neural progenitor cell biology (Fish et al., 2006).”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Fish et al., 2006 source
Not checked in the free run.
- Interpretationown data
FoxOs attenuate Wnt signaling in NSC.
“FoxOs attenuate Wnt signaling in NSC”
Quote in the paperSubstantial claim - Interpretationown data
FoxO function in neural stem cells shows greater diversity of activities and pathway engagement than in hematopoietic stem cells.
“relative to FoxO function in the HSC (Tothova et al., 2007), this report establishes that its function in the NSC shows a greater diversity of activities and pathway engagement.”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Tothova et al., 2007 source
Not checked in the free run.
- Interpretationown data
sFRP1/2 and SOST act cooperatively as soluble inhibitors of the Wnt pathway to repress Wnt signaling in neural stem cells.
“suggesting that these novel FoxO targets act cooperatively as soluble inhibitors of the Wnt pathway to repress Wnt signaling in NSC.”
Quote in the paperSubstantial claim - Interpretationreasoning
Mammalian FoxOs have evolved to serve as pro-longevity tumor suppressors designed primarily to maintain homeostasis and integrity of long-lived cells including tissue stem cell reserves.
“this study shows that the mammalian FoxOs have evolved to serve as pro-longevity tumor suppressors designed primarily to maintain the homeostasis and the integrity of long-lived cells including tissue stem cell reserves.”
Quote in the paperSubstantial claim
- May combine two claims. 28
- The quote only partly states this claim. 1
- Classified as probably not a substantial claim. 11
May combine two claims.
Findingown dataLate passage (P7) NAC-treated or SESN3-transduced FoxO null NSC show improved BrdU incorporation (0.09 vs 0.21, p<0.01), decreased apoptosis, and increased neurosphere diameter.
“the late passage (P7) of NAC-treated or SESN3-transduced FoxO null NSC showed improved proliferation as measured by BrdU incorporation (Figure 3B and D; 0.09 vs 0.21, p<0.01), decreased apoptosis (Figure 4D), and increased overall neurosphere diameter”
Quote in the paperSubstantial claimMay combine two claims.
Findingown dataNSC with ASPM knockdown show decreased neurosphere size and self-renewal potential in single cell clonogenic assays (95.4 vs 48.2 and 54.1 μm, p<0.01; 1.6% vs 0 and 0.3%, p<0.05), associated with increased cell cycle exit and differentiation.
“NSC with ASPM knockdown exhibited significant decrease in size of neurospheres and self-renewal potential in single cell clonogenic assays (Figure 5G and Supplemental Figure S6e; 95.4μm vs 48.2μm and 54.1μm in average diameter, p<0.01 and 1.6% vs 0 and 0.3% for self-renewal, p<0.05), a phenotype associated with increased cell cycle exit and differentiation”
Quote in the paperSubstantial claimMay combine two claims.
Findingown dataFoxO null cultures show reduced BrdU incorporation (0.2 vs 0.07, p=0.03) and reduced average neurosphere diameter (90.3 μm vs 61.4 μm, p=0.0043).
“FoxO null cultures exhibited significant reduction in proliferation by BrdU incorporation (Figure 2C; 0.2 vs 0.07, p=0.03) and in average diameter of neurospheres (Figure 2C; Supplemental Figure S6a; 90.3μm vs 61.4μm, p=0.0043).”
Quote in the paperSubstantial claimMay combine two claims.
Findingown dataAcute in vitro deletion of all three FoxOs using Rosa26-CreERT2 decreases self-renewal capacity (3.9% vs 1.9%, p=0.096), neurosphere diameter (157.8 vs 98.6 μm, p<0.0001), and BrdU incorporation (0.38 vs 0.16, p=0.010).
“acute in vitro deletion of all three FoxOs using the transiently 4OHT-activated Rosa26-CreERT2 system resulted in a same decrease in self-renewal capacity (Figure 2D; 3.9% vs 1.9%, p=0.096) along with decreased average diameter of neurospheres (Figure 2D; Supplementary Fig. S6b; 157.8μm vs 98.6μm, p<0.0001) and proliferation as per BrdU incorporation (Figure 2D; 0.38 vs 0.16, p=0.010).”
Quote in the paperSubstantial claimMay combine two claims.
Findingown dataWithin the ventricular zone, FoxO1 expression is highest in Nestin-positive radial glial progenitors of the dorso-medial wall, while FoxO3 is expressed more broadly.
“Within the VZ, FoxO1 expression is somewhat restricted with the highest level of expression noted in Nestin-positive radial glial progenitors of the dorso-medial wall of the VZ; in contrast, FoxO3 is expressed more broadly throughout all regions of the VZ examined”
Quote in the paperNot a substantial claimMay combine two claims.
Findingown dataHypertrophic astrocytes are detected only in older FoxO null animals (>32 weeks) and in vitro differentiated cultures from late-passage FoxO null NSC.
“we detected the presence of hypertrophic astrocytes only in older FoxO null animals (>32 week) and in vitro differentiated culture from late passage FoxO null NSC”
Quote in the paperNot a substantial claimMay combine two claims.
Findingown dataContinued passage of FoxO null NSC cultures leads to exhaustion of neurosphere formation potential, decreased proliferation, and marginally increased apoptosis.
“continued passage in culture showed exhaustion of neurosphere formation potential with accompanying decreased proliferation and marginally increased apoptosis”
Quote in the paperSubstantial claimMay combine two claims.
Findingown dataIn early passage FoxO null NSC, NAC treatment up to 5 mM has no effect on transient hyper-proliferation or on proliferation of FoxO WT NSC (0.295 vs 0.294, p=0.966, P2).
“in the early passage FoxO null NSC, NAC treatment (up to 5mM) had no effect on the transient hyper-proliferation phenotype nor did it affect the proliferation of FoxO WT NSC (Figure 4B; con vs NAC, 0.295 vs 0.294, p=0.966, P2).”
Quote in the paperSubstantial claimMay combine two claims.
Findingown dataFoxO null brains show progressive ventricular dilation and thinning of the lateral ventricular wall and SVZ (100% vs 751.1%, p=0.011).
“the FoxO null brain shows consistent and progressive ventricular dilation and thinning of the lateral ventricular wall and SVZ (Supplemental Figure S4a and b; 100% vs 751.1%, p=0.011)”
Quote in the paperSubstantial claimMay combine two claims.
Findingown dataMany potential novel FoxO targets relate to cell cycle and glial differentiation and functionally interact with FoxOs.
“many potential novel FoxO targets that relate well to our biological observations including cell cycle (e.g., G two and S phase expressed1, Cdk inhibitor 1C, Sal like2) and glial differentiation (e.g., Hes5, Sox10, Myelin basic protein, Plp1, Cystatin C) and that functionally interact with FoxOs (e.g. FoxG1, Sirt2)”
Quote in the paperSubstantial claimMay combine two claims.
Findingown data15-week-old FoxO null brains show declines in DCX-positive cells (1 vs 0.283, p=0.0039) and Ki67-positive cells (1 vs 0.717, p=0.026).
“there was an accompanying decline in doublecortin (DCX, Figure 2B; gray bars, 1 vs 0.283, p=0.0039) and Ki67 (Figure 2B; gray bars, 1 vs 0.717, p=0.026) positive cells”
Quote in the paperSubstantial claimMay combine two claims.
Findingown dataBoth FoxO null and sFRP1/2 and SOST knockdown neural stem cells showed increased basal proliferation.
“both FoxO null and sFRP1/2 and SOST knockdown NSC showed increased basal proliferation”
Quote in the paperSubstantial claimMay combine two claims.
Findingown dataThe Wnt3a-induced proliferative response is short-lived and followed by a substantial decline in the number of cycling cells, resembling the growth kinetics of FoxO null neural stem cell culture.
“the Wnt3a-induced proliferative response is short-lived and is followed by substantial decline in number of cycling cells, resembling the growth kinetics of FoxO null NSC culture (Figure 6G).”
Quote in the paperSubstantial claimThe quote only partly states this claim.
Findingown dataCombined knockdown of sFRP1/2 and SOST increased Wnt3a-induced reporter activity by 1.5-fold.
“Combined knockdown of all three sFRP1/2 and SOST resulted in a 1.5-fold increase in Wnt3a-induced reporter activity”
Quote in the paperSubstantial claimProbably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.
PremisecitationLoss of all three FoxOs in HSCs decreases expression of ROS-detoxifying enzymes β-catalase and MnSOD, and increased ROS in FoxO null HSCs is causally linked to enhanced G0 exit, apoptosis, and progressive depletion of HSC reserves.
“We have previously reported that loss of all three FoxOs in HSC results in decreased expression of ROS-detoxifying enzymes, β-catalase and MnSOD, and that increased intracellular ROS levels in FoxO null HSC are causally linked to enhanced G0 exit and increased apoptosis, resulting in progressive depletion of HSC reserves (Tothova et al., 2007).”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites Tothova et al., 2007 source
Not checked in the free run.
Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.
PremisecitationNewly generated neuroblasts in the SVZ migrate to the olfactory bulb, and those in the SGZ migrate into the dentate gyrus granule cell layer, affecting memory and behavior.
“Newly generated neuroblasts in the SVZ migrate to become granule and periglomerular neurons in the olfactory bulb and neurons born in the SGZ migrate into the granule cell layer of the DG and. become dentate granule cells, contributing to the maintenance and reorganization of the existing circuitry and affecting memory and behavior (Imayoshi et al., 2008; reviewed in Zhao et al., 2008).”
Quote in the paperNot a substantial claim0 of 2 sources checkedMay combine two claims.
Interpretationown dataFoxOs regulate proliferative and self-renewal potential of NSC, and loss of FoxO function results in progressive decline of NSC number.
“Together, these findings suggest that FoxOs regulate the proliferative and self-renewal potential of NSC and that the loss of FoxO function results in the progressive decline of NSC number.”
Quote in the paperSubstantial claimClassified as probably not a substantial claim. May combine two claims.
PremisecitationMammalian FoxO transcription factors act downstream of PI3K-AKT and control genes involved in proliferation, survival, metabolism, differentiation, and oxidative defense.
“the mammalian FoxO family of transcription factors (FoxO1, 3 and 4, hereafter referred collectively as ‘FoxOs’) also act as key downstream effectors of PI3K-AKT pathway and function to control many genes governing various cellular processes such as proliferation, survival, metabolism, differentiation, and oxidative defense”
Quote in the paperSubstantial claim0 of 1 sources checked- cites Greer and Brunet, 2005
Not checked in the free run.
Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.
PremisecitationASPM is a determinant of human cerebral cortical size; individuals with ASPM germline loss-of-function mutations show primary microcephaly.
“In humans, ASPM is a determinant of human cerebral cortical size, i.e., individuals with ASPM germline loss-of-function mutations show primary microcephaly (Bond et al., 2002).”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites Bond et al., 2002 source
Not checked in the free run.
Probably not a substantial claim: may not pass S3 (load-bearing).
PremisecitationFoxOs regulate distinct sets of gene targets depending on cell type, tissue context, and developmental stage.
“the FoxOs have been shown to regulate distinct sets of gene targets depending on cell type, tissue context and developmental stage (Paik et al., 2007; Tothova et al., 2007).”
Quote in the paperNot a substantial claim0 of 2 sources checkedMay combine two claims.
Interpretationown dataFoxOs constrain cycling of NSC and/or progenitor cells but not their size.
“Together, these observations suggest that FoxOs function to constrain the cycling of NSC and/or progenitor cells, but not their size”
Quote in the paperSubstantial claimClassified as probably not a substantial claim.
PremisecitationASPM expression is required for symmetric, proliferative divisions of neural stem/progenitor cells of the mammalian brain.
“ASPM expression has been shown to be required for symmetric, proliferative divisions of neural stem/progenitor cells of the mammalian brain (Fish et al., 2006; Horvath et al., 2006).”
Quote in the paperSubstantial claim0 of 2 sources checkedMay combine two claims.
Premiseown dataFoxOs function redundantly to promote stability of long-lived cells such as thymocytes and endothelial cells and to maintain hematopoietic stem cell reserves.
“Recent studies from our group have underscored that the mammalian FoxOs function redundantly to promote the stability of long-lived cells such as thymocytes and endothelial cells and to maintain hematopoietic stem cell (HSC) reserves”
Quote in the paperNot a substantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
PremisecitationIn adult mice, relatively quiescent neural stem cells give rise to transit-amplifying progenitors that divide rapidly and contribute to neuroblasts.
“In adult mice, relatively quiescent NSC give rise to transit-amplifying progenitor cells which rapidly divide and contribute to neuroblasts (Morshead et al., 1994; reviewed in Zhao et al., 2008).”
Quote in the paperNot a substantial claim0 of 2 sources checkedMay combine two claims.
Interpretationown dataFoxO-directed regulation of intracellular ROS plays an important role in NSC self-renewal capacity but no discernable role in controlling NSC proliferation activity.
“Together, these studies suggest that, while FoxO-directed regulation of intracellular ROS level plays an important role in NSC self renewal capacity, it plays no discernable role in controlling the proliferation activity of the NSC.”
Quote in the paperSubstantial claimMay combine two claims.
InterpretationreasoningFoxOs function to support NSC homeostasis in vivo, perhaps by preventing rapid amplification of progenitors and consequent exhaustion of relatively quiescent NSC.
“Thus, we propose that the FoxOs function to support NSC homeostasis in vivo, perhaps by preventing the rapid amplification of progenitors and the consequent exhaustion of the relatively quiescent NSC.”
Quote in the paperSubstantial claimMay combine two claims.
Interpretationown dataFoxOs constrain proliferative activity of NSC and/or progenitor cells in the young adult brain and in early passage cultures.
“Thus, FoxOs constrain the proliferative activity of NSC and/or progenitor cells in the young adult brain and in early passage cell cultures.”
Quote in the paperSubstantial claimMay combine two claims.
Interpretationown dataThese observations reinforce cross talk between FoxO and Wnt signaling pathways in neural stem cells and the importance of finely tuned Wnt pathway activation for long-term neural stem cell homeostasis.
“These observations further reinforce the cross talk between FoxO and Wnt signaling pathways in NSC and the importance of finely-tuned Wnt pathway activation in the long-term homeostasis of NSC.”
Quote in the paperSubstantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
PremisecitationFunctional redundancy among FoxOs exists in other tissues.
“Consistent with functional redundancy among FoxOs in other tissues (Paik et al., 2007)”
Quote in the paperNot a substantial claim0 of 1 sources checked- cites Paik et al., 2007 source
Not checked in the free run.
May combine two claims.
PremisecitationOther tumor suppressors such as p16Ink4a suppress cancer at the cost of tissue resident stem cells and may contribute to decreased regenerative potential during aging.
“other tumor suppressors (e.g., p16Ink4a) which appear to suppress cancer at the cost of tissue resident stem cells and therefore may contribute to decreased regenerative potential during the aging process (Krishnamurthy et al., 2006; Molofsky et al., 2006).”
Quote in the paperNot a substantial claim0 of 2 sources checkedMay combine two claims.
Interpretationown dataFoxOs enforce neural stem cell quiescence and control neural stem cell self-renewal.
“establishes a role for FoxOs in the enforcement of NSC quiescence and control of NSC self-renewal.”
Quote in the paperSubstantial claimClassified as probably not a substantial claim.
Study design and conductnone givenAll experimental and control animals were littermates or age matched.
“All experimental and control animals were littermates or age matched.”
Quote in the paperSubstantial claimProbably not a substantial claim: may not pass S3 (load-bearing).
PremisecitationFoxOs have a role in cellular fate determination in myogenesis and hematopoiesis.
“previously reported role for FoxOs in cellular fate determination observed in myogenesis and hematopoiesis (Hu et al., 2008; Kitamura et al., 2007; Tothova et al., 2007).”
Quote in the paperNot a substantial claim0 of 3 sources checkedMay combine two claims.
Study design and conductown dataWnt3a, but not Wnt5a, induces TCF/Lef/β-catenin-dependent transcriptional activity, confirming specificity of the TOFlash reporter for canonical Wnt signaling.
“Addition of Wnt3a, but not Wnt5a, induced TCF/Lef/β-catenin dependent transcriptional activity confirming the specificity of reporter activity responsive to the canonical Wnt signaling.”
Quote in the paperSubstantial claimClassified as probably not a substantial claim.
PremisecitationLoss of PTEN results in sustained proliferative potential of neural stem cells.
“loss of the negative regulator PTEN was shown to result in sustained proliferative potential of NSC (Groszer et al., 2006; Groszer et al., 2001).”
Quote in the paperSubstantial claim0 of 2 sources checkedMay combine two claims.
Interpretationown dataFoxO regulates ROS detoxification, Wnt signaling, cell cycle, and differentiation processes.
“FoxO regulates ROS detoxification, Wnt signaling, cell cycle, and differentiation processes”
Quote in the paperSubstantial claim
The paper relies on this without support.
Wnt signaling is essential for tissue stem cell renewal.
“while Wnt signaling is clearly essential for tissue stem cell renewal”
Claims other papers make about this one
Each is checked against this paper’s own text: does it say what the citing paper says it does?
In mouse HSCs and neural stem cells, excessive cellular ROS concentrations cause abnormal proliferation, malignancy, and compromised self-renewal.
“in HSCs and neural stem cells (NSCs) of mice, excessive cellular ROS concentrations lead to abnormal proliferation, malignancy and compromised stem cell self-renewal11–14”
From Stem cell aging: mechanisms, regulators and therapeutic opportunities (2014) · cites this paper as [14]
Similar effects occur in NSCs of FoxO-deficient mice and in HSCs and NSCs of mice lacking only FoxO3.
“Similar results have been reported for NSCs in these FoxO-deficient mice14 and in HSCs and NSCs in mice lacking only FoxO3 (refs. 16–18).”
From Stem cell aging: mechanisms, regulators and therapeutic opportunities (2014) · cites this paper as [14]
Combined conditional deletion of Foxo1, Foxo3, and Foxo4 in adult neural stem/progenitor cells correlates with abnormal morphological features of differentiated neurons.
“combined conditional deletion of genes coding for FOXO (forkhead box, sub‐group O; Foxo1, Foxo3, and Foxo4) in adult neural stem/progenitor cells correlates with abnormal morphological features of differentiated neurons (Paik et al, 2009).”
From Autophagy in major human diseases (2021) · cites this paper as Paik et al, 2009
FOXO transcription factors integrate growth factors and stress signal transduction pathways, and may represent a hub for the action of various systemic factors in stem cells in ageing brain, muscle, blood and intestine.
“For example, FOXO transcription factors integrate growth factors and stress signal transduction pathways, and may represent a ‘hub’ for the action of various systemic factors in stem cells in ageing brain, muscle, blood and intestine32,85–90.”
From Ageing and rejuvenation of tissue stem cells and their niches (2023) · cites this paper as [87]
Constitutive deletion of three of the FOXO genes (FOXO1, FOXO3 and FOXO4) in the MuSC lineage during development results in the impairment of postnatal establishment of the MuSC population and a more rapid MuSC depletion with age.
“Consistent with previous reports of the role of FOXO factors in HSC, MuSC and NSC quiescence85–90, constitutive deletion of three of the FOXO genes (FOXO1, FOXO3 and FOXO4) in the MuSC lineage during development results in the impairment of postnatal establishment of the MuSC population and a more rapid MuSC depletion with age32.”
From Ageing and rejuvenation of tissue stem cells and their niches (2023) · cites this paper as [87]
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Self-citationDoetsch, F. K., García‐Verdugo, J. M., Caillé, I., Álvarez-Buylla, A., Chao, M. V., & Casaccia‐Bonnefil, P. (2002) · Journal of Neuroscience · doi:10.1523/jneurosci.22-06-02255.2002 · Cited by 202 · see citing works
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Codependent Activators Direct Myoblast-Specific MyoD Transcription
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Self-citationBirkenkamp, K. U., Essafi, A., van der Vos, K. E., Costa, M. D., Hui, R. C.-Y., Holstege, F. C. P., Koenderman, L., Lam, E. W. ‐., & Coffer, P. J. (2006) · Journal of Biological Chemistry · doi:10.1074/jbc.m606669200 · Cited by 83 · see citing works
Foxo3a is essential for maintenance of the hematopoietic stem cell pool.
Miyamoto, K., Araki, K. Y., Naka, K., Arai, F., Takubo, K., Yamazaki, S., Matsuoka, S., Miyamoto, T., Ito, K., Ohmura, M., et al. (2007) · Cell stem cell · doi:10.1016/j.stem.2007.02.001 · Cited by 41 · see citing works
Analysis of human tumors by laser scanning cytometry
Gorczyca, W. A., Deptała, A., Bedner, E., et al. (2001) · Methods in cell biology · doi:10.1016/s0091-679x(01)64024-x · Cited by 18 · see citing works
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Adult Neurogenesis in the Mammalian Brain: Significant Answers and Significant Questions
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Signal transduction by reactive oxygen species
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Autophagy in major human diseases
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Telomerase reactivation reverses tissue degeneration in aged telomerase-deficient mice
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Linking functional decline of telomeres, mitochondria and stem cells during ageing
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Self-citationFoxO3 Regulates Neural Stem Cell Homeostasis
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Adaptive Chromatin Remodeling Drives Glioblastoma Stem Cell Plasticity and Drug Tolerance
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SIRT3 Reverses Aging-Associated Degeneration
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Ageing and rejuvenation of tissue stem cells and their niches
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“FoxO1/3/4 Directly Regulate Long-TermMaintenance of the Radial Glia-like Neural Stem/Progenitor Cell Pool Mice with a germline deletion of FoxO3 or a conditional developmental deletion of FoxO1/3/4 display premature depletion of the adult NSPC pool and a progressive impairment of adult neurogenesis (Paik et al., 2009;…”
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- Authors
- Paik, J.-H., Ding, Z., Narurkar, R., Ramkissoon, S., Muller, F., Kamoun, W. S., Chae, S.-S., Zheng, H., Ying, H., Mahoney, J., Hiller, D., Jiang, S., Protopopov, A., Wong, W. H., Chin, L., Ligon, K. L., & DePinho, R. A.
- Affiliations
- Harvard University (US)
- Stanford University (US)
- Corresponding author
- DePinho, Ronald A.
- ORCID
- Venue
- Cell Stem Cell
- Publisher
- Elsevier BV
- Published
- 2009-11
- Volume
- 5
- Issue
- 5
- Pages
- 540-553
- ISSN
- 1875-9777 (ISSN-L)
- 1934-5909
- PMC
- PMC3285492
- OpenAlex
- W1965306647
- Cited by
- 459
- References
- 54
- Citations by year
- 2026: 8 · 2025: 12 · 2024: 23 · 2023: 27 · 2022: 23 · 2021: 35 · 2020: 34 · 2019: 16 · 2018: 35 · 2017: 32 · 2016: 28 · 2015: 31 · 2014: 24 · 2013: 43 · 2012: 32
- FWCI
- 11.80
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- Cell stem cell (publishedVersion)
- PubMed (publishedVersion)
- Europe PMC (PubMed Central) (acceptedVersion)
- PubMed Central (acceptedVersion)
- Cold Spring Harbor Laboratory Institutional Repository (Cold Spring Harbor Laboratory) (acceptedVersion)
- Funders
- Ellison Medical Foundation
- Damon Runyon Cancer Research Foundation
- American Brain Tumor Association
- Barr Foundation
- National Cancer Institute (5P01CA95616, P01CA095616)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › FOXO transcription factor regulation
- Life Sciences › Neuroscience › Developmental Neuroscience › Neurogenesis and neuroplasticity mechanisms
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Developmental Biology and Gene Regulation
- Keywords
- FOXO transcription factors, FOXO1, FOXO3, FOXO4, neural stem cells, neural progenitor cells, PI3K/Akt signaling, brain size, neurogenesis, cell proliferation, cell differentiation, antioxidant defense, gene expression regulation, lifespan regulation
- MeSH terms
- Animals, Brain, Calmodulin-Binding Proteins, Cell Differentiation, Cells, Cultured, Nerve Tissue Proteins, Organ Size, Oxygen, Signal Transduction, Reactive Oxygen Species, Mice, Knockout, Gene Expression Regulation, Developmental, RNA, Small Interfering, Multipotent Stem Cells, Cell Proliferation, Wnt Proteins, Mice, Forkhead Transcription Factors, Neurogenesis
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Claims read by deepseek-v4.1-flash under definition version 3 (extract-v3) on 2026-10-06.
Classified by jev-1.13-20260917 (gold-guideline-v0.2) on 2026-10-06.
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