Cited by 518Telomeres, Telomerase, and SenescenceGenetics, Aging, and Longevity in Model OrganismsNeuroinflammation and Neurodegeneration Mechanisms

Cellular senescence in brain aging and neurodegenerative diseases: evidence and perspectives

Open access
Baker, Darren J., Petersen, Ronald C.·2018·Journal of Clinical Investigation

Abstract

Along with a general decline in overall health, most chronic degenerative human diseases are inherently associated with increasing age. Age-associated cognitive impairments and neurodegenerative diseases, such as Parkinson's and Alzheimer's diseases, are potentially debilitating conditions that lack viable options for treatment, resulting in a tremendous economic and societal cost. Most high-profile clinical trials for neurodegenerative diseases have led to inefficacious results, suggesting that novel approaches to treating these pathologies are needed. Numerous recent studies have demonstrated that senescent cells, which are characterized by sustained cell cycle arrest and production of a distinct senescence-associated secretory phenotype, accumulate with age and at sites of age-related diseases throughout the body, where they actively promote tissue deterioration. Cells with features of senescence have been detected in the context of brain aging and neurodegenerative disease, suggesting that they may also promote dysfunction. Here, we discuss the evidence implicating senescent cells in neurodegenerative diseases, the mechanistic contribution of these cells that may actively drive neurodegeneration, and how these cells or their effects may be targeted therapeutically.

Integrity signals

Registry

Crossref · 10.1172/jci95145

Cites

101 of 101 references verified0 citation errors · 0 not checkable

Statistics

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Claims the paper makes

0 of 43 cited sources checked · 0 supported · 0 flagged

  • Premisecitation

    Senescent cells accumulate in multiple tissues during aging and in disease.

    “Recent work has demonstrated that senescent cells, characterized by an arrested cell cycle that is triggered by a variety of stresses, accumulate in various tissues of age and disease (4)(5)(6)(7)(8)”
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    • cites (4)(5)(6)(7)(8)

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  • Premisecitation

    Aging leads to chronic low-grade inflammation in the brain in the absence of an obvious pathogen.

    “Just like in peripheral tissues, aging leads to a chronic low-grade inflammation in the brain (42), which occurs in the absence of any obvious pathogen.”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [42] Frank-Cannon, 2009, Does neuroinflammation fan the flame in neurodegenerative diseases?, Mol Neurodegener source

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  • Premisenone given

    The markers currently used to identify senescent cells are not unique to senescent cells.

    “As these markers are not truly unique to senescent cells, it is imperative to establish that these changes occur in the context of senescence and not just as a result of inflammation, for example.”
    Quote in the paperSubstantial claim
  • Premisecitation

    With age, human brain tissue displays an increase in astrocytes positive for p16 and MMP3.

    “With age, human brain tissue displays an increase in the number of astrocytes positive for p16 INK4A and matrix metalloproteinase 3 (MMP3) (57), a common SASP-associated protease.”
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    • cites [57] source

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  • Premisecitation

    Microglia from aged mice produce increased IL-6, IL-1β, and TNF-α, all factors upregulated in senescent cells.

    “Microglia from aged mice exhibit increased production of the proinflammatory cytokines IL-6, IL-1β, and TNF-α (48, 49), all of which are factors upregulated in senescent cells (9).”
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    • cites [48] source

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    • cites [49] Bachstetter, 2011, Microglial p38α MAPK is a key regulator of proinflammatory cytokine up-regulation induced by toll-like receptor (TLR) ligands or beta-amyloid (Aβ), J Neuroinflammation source

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    • cites [9] Coppé, 2008, Senescence-associated secretory phenotypes reveal cell-nonautonomous functions of oncogenic RAS and the p53 tumor suppressor, PLoS Biol source

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  • May combine two claims. 20
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    Premisecitation

    Senescent cells drive various natural age-related pathologies, shorten life, and promote atherosclerosis and osteoarthritis.

    “Subsequent studies using the INK-ATTAC model determined that senescent cells drive various natural age-related pathologies, shorten life, and promote the age-associated diseases atherosclerosis and osteoarthritis (20,(29)(30)(31).”
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    • cites (20,(29)(30)(31)

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    Premisecitation

    p16 is a biomarker of natural aging, with expression increasing in various tissues over time.

    “Importantly, p16 INK4A is a biomarker of natural aging, as its expression increases in a variety of tissues with time (28).”
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    • cites [28] source

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    Interpretationcitation

    Chronic low-grade brain inflammation contributes to decreased pre- and postsynaptic densities, fewer synapses and dendritic spines, and cognitive impairment and memory loss in aged individuals.

    “This contributes to decreased pre-and postsynaptic densities, as well as decreased synapses and dendritic spines overall (43), resulting in cognitive impairments and memory loss in aged individuals.”
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    • cites [43] source

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    Premisecitation

    Neurons of aged mice accumulate high amounts of DNA damage and display elevated proinflammatory molecules and SA β-gal activity.

    “Studies have demonstrated that neurons of aged mice accumulate high amounts of DNA damage (16) and display elevated expression of proinflammatory molecules and SA β-gal activity (41), characteristics typical of senescence.”
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    • cites [16] source

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    • cites [41] source

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    Premisereasoning

    No single marker can independently define a senescent cell, so multiple hallmarks are needed.

    “It is important to note that while these changes are indicative of senescence, there is currently no single marker that can be used independently to define a senescent cell.”
    Quote in the paperSubstantial claim
  • Classified as probably not a substantial claim.

    Premisecitation

    Senescence is a distinct proinflammatory cell fate with a secretome of cytokines, chemokines, proteases, and growth factors known as SASP.

    “Unlike a normally programmed terminal differentiation process, senescence is a distinct proinflammatory fate in which cells acquire a distinctive secretome of cytokines, chemokines, proteases, and growth factors collectively known as the senescence-associated secretory phenotype (SASP) (9).”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [9] Coppé, 2008, Senescence-associated secretory phenotypes reveal cell-nonautonomous functions of oncogenic RAS and the p53 tumor suppressor, PLoS Biol source

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    Premisecitation

    BUBR1 hypomorphic mice display blood-brain barrier leakage that correlates with premature senescence of neural endothelial cells and pericytes, which become SA β-gal positive and express p16.

    “BUBR1 hypomorphic mice display leakage across the BBB that correlates with a propensity for neural endothelial cells and pericytes to prematurely senesce, become SA β-gal positive, and express p16 INK4A (66).”
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    • cites [66] source

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    Premisereasoning

    With aging and at brain pathology sites, senescent cells might build up.

    “The above studies suggest that senescent cells may accumulate with age and at sites of pathology in the brain.”
    Quote in the paperSubstantial claim
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    Premisecitation

    p16 INK4A-deficient mice develop many tumors and die before normal mice show cognitive decline.

    “One limitation of genetic inactivation experiments is that mice lacking p16 INK4A are highly tumor prone and therefore die before the cognitive decline is observed in normal mice (90).”
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    • cites [90] source

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    Premisecitation

    A common feature of PD patients and mouse models is accumulation of activated microglia and astrocytes, which would promote increased local concentrations of inflammatory mediators and ROS.

    “Interestingly, a common feature of PD patients and mouse models is the accumulation of activated microglia and astrocytes, which would promote increased local concentrations of inflammatory mediators and ROS (84).”
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    • cites [84] source

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  • Classified as probably not a substantial claim. May combine two claims.

    Interpretationreasoning

    Causal proof that senescent cells drive neuropathology could come from blocking senescence entry via p16 INK4A genetic inactivation or from removing senescent cells with engineered mice.

    “A true demonstration that senescent cells causally drive neuropathology can be achieved either by prevention of senescence entry through genetic inactivation of p16 INK4A or by direct elimination of senescent cells using genetically engineered mice.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Premisecitation

    Navitoclax clears senescent cells appearing in early atherosclerotic plaques and after sublethal irradiation in skeletal muscle and bone marrow.

    “Navitoclax treatment has been shown to eliminate senescent cells that arise in early atherosclerotic plaques (30) and upon sublethal irradiation in both skeletal muscle and the bone marrow (93).”
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    • cites [30] source

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    • cites [93] source

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    Premisereasoning

    Removing senescent cells is feasible and can modulate inflammatory diseases.

    “The finding that senescent cell elimination is not only possible but also effective at modulating inflammatory diseases has triggered profound interest in developing therapeutic strategies to eliminate senescent cells in the absence of genetic modifications.”
    Quote in the paperSubstantial claim
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    Premisecitation

    Ganciclovir is converted by HSV-TK into a toxic DNA chain terminator within p16 INK4A-expressing cells, causing senescent cells to undergo mitochondria-dependent apoptosis.

    “When ganciclovir is administered, HSV-TK converts this compound into a toxic DNA chain terminator in p16 INK4A -expressing cells, triggering apoptosis in senescent cells through mitochondria-dependent cell death (92).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [92] Laberge, 2013, Mitochondrial DNA damage induces apoptosis in senescent cells, Cell Death Dis source

      Not checked in the free run.

  • May combine two claims.

    Premisenone given

    Senolytic treatments remove both the senescent cell and its SASP.

    “These “senolytic” approaches eliminate not only the senescent cell but also the accompanying SASP, which likely exerts beneficial effects in the local environment where senescent cells reside.”
    Quote in the paperNot a substantial claim
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    Premisecitation

    ABT-737 and navitoclax bind the inhibitory pockets of BCL-2 family proteins, blocking their anti-apoptotic function.

    “The senolytic molecules ABT-737 (37) and navitoclax (ABT-263) (93) occupy the inhibitory binding regions of members of the BCL-2 family of proteins, thereby canceling their antiapoptotic activity.”
    Quote in the paperNot a substantial claim0 of 2 sources checked
    • cites [37] Yosef, 2016, Directed elimination of senescent cells by inhibition of BCL-W and BCL-XL, Nat Commun source

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    • cites [93] source

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  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Interpretationreasoning

    For some senolytic compounds, the blood-brain barrier might prevent systemic delivery from reaching the target.

    “The BBB may preclude systemic administration for some of these compounds to get to the target site.”
    Quote in the paperNot a substantial claim
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    Interpretationreasoning

    In the short term senescence helps tissue repair and remodeling, but over the long term its effects seem mostly harmful.

    “The aforementioned studies demonstrate a beneficial role for senescence in tissue repair and remodeling in the short term, whereas the long-term consequences appear to be largely detrimental.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Interpretationreasoning

    Should senolytics be used for neurological conditions, several candidates probably reach the brain in both aging and disease.

    “Therefore, if these approaches are to be implemented in neurological conditions, there are likely a number of candidates that demonstrate bioavailability in the brain, in the context of both aging and disease.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Premisereasoning

    Treatments have been short and follow-up brief, so studies so far have not detected long-term adverse effects.

    “Furthermore, the duration of treatments has been brief with relatively short follow-up assessments, so long-term negative consequences have not been observed in studies to date.”
    Quote in the paperNot a substantial claim
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    Study design and conductnone given

    That study's animals lived in a controlled setting and received no external stressors.

    “It is important to keep in mind that the animals used in this study were in a controlled environment without any exogenous stresses applied.”
    Quote in the paperSubstantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

    Premisenone given

    After cells become senescent, several distinguishing features appear, varying by cell type and inducing stimulus.

    “Once they have entered into this state, a number of distinguishing qualities can be observed.depending on the cell type and senescence-inducing stimuli.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisenone given

    Various internal and external stressors can push normal cells to become senescent.

    “A number of stressors, both intrinsic and extrinsic, can stimulate the conversion of otherwise normal cells into senescent cells.”
    Quote in the paperNot a substantial claim
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  • The paper relies on this without support.

    The risk of developing neurodegenerative diseases increases dramatically with age.

    “The risk of developing many pathological conditions, including neurodegenerative diseases, increases dramatically with age.”
  • The paper relies on this without support.

    None of the numerous clinical trials to treat Alzheimer's disease have demonstrated a beneficial impact for patients.

    “Unfortunately, of the numerous clinical trials to treat AD, none have been able to demonstrate beneficial impact for patients.”
  • The paper relies on this without support.

    The role of senescent cells in causing and worsening neurodegenerative disorders remains unknown.

    “However, the significance of senescent cells in both the induction and exacerbation of neurodegenerative disorders is unknown.”
  • The paper relies on this without support.

    Determining the overall importance and mechanism of senescent cells in neuropathology has been very hard because tools to identify, isolate, or remove these cells are lacking.

    “To date, it has been extremely difficult to discern the overall significance and mechanistic contribution of senescent cells to neuropathology because of a lack of tools to identify, isolate, and/or eliminate these cells.”
  • The paper relies on this without support.

    These methods have not yet been used in relevant neurodegenerative disease studies.

    “To date, these approaches have not been employed for relevant studies of neurodegenerative disease.”
  • The paper relies on this without support.

    Whether and how senolytics can be translated into clinical practice is currently unclear.

    “It is currently unclear how these various senolytics can be translated into clinical strategies, if at all.”
  • The paper relies on this without support.

    No reliable method currently exists to detect the early signs of neurodegenerative diseases.

    “as there is currently no reliable way to identify the early signs of these devastating diseases.”
  • The paper relies on this without support.

    The molecular features that accompany normal aging and CNS disease remain incompletely characterized.

    “The molecular correlates of normal aging and CNS disease are not fully defined.”
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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?

  • Senescent cells contribute to aging and age-related pathologies through SASP.

    “Senescent cells contribute to aging and age-related pathologies21,22,23 through their senescence-associated secretory phenotype (SASP).24,25,26”

    From Uncovering the signatures of aging and senescence in the human dorsolateral prefrontal cortex (2026) · cites this paper as [22]

    The Introduction (page unavailable) says senescent cells accumulate with age and disease and may contribute to pathology; it also identifies their secretory phenotype as the SASP. The discussion of senescent-cell properties (page unavailable) calls the SASP-mediated link to age-related disease plausible, rather than establishing that senescent cells cause aging and age-related pathologies through SASP. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • Cellular senescence can augment glial function and accelerate brain aging.

    “Cellular senescence is yet another factor that can augment glial function and accelerate brain aging.”

    From Connecting aging biology and inflammation in the omics era (2022) · cites this paper as [167]

  • Microglia, astrocytes, brain endothelial cells, and other CNS cell types show evidence of senescence and increased expression of senescence factors.

    “Microglia, astrocytes, brain endothelial cells, and other CNS cell types show evidence of senescence and increased expression of senescence factors (167, 168).”

    From Connecting aging biology and inflammation in the omics era (2022) · cites this paper as [167]

  • Cellular senescence plays a crucial role in brain aging, neurodegeneration, and dementia through the SASP, which represents a major source of inflammation.

    “Among these aging hallmarks, cellular senescence plays a crucial role in brain aging, neurodegeneration, and dementia 36 through the SASP, which represents a major source of inflammation. 37”
  • The burden of senescent cells in the brain increases with advanced age and neurodegenerative diseases and occurs across neurons, microglia, astrocytes, oligodendrocyte precursor cells, and endothelial cells.

    “The burden of senescent cells in the brain increases with advanced chronological age and neurodegenerative diseases, and occurs across cell types including neurons, microglia, astrocytes, oligodendrocyte precursor cells, and endothelial cells (28–32).”

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Authors
Baker, D. J., & Petersen, R. C.
Affiliations
Mayo Clinic (US)
Venue
Journal of Clinical Investigation
Published
2018-02-19
Volume
128
Issue
4
Pages
1208-1216
ISSN
  • 0021-9738 (ISSN-L)
  • 1558-8238
OpenAlex
W2789191208
Cited by
514
References
102
Citations by year
2026: 57 · 2025: 88 · 2024: 76 · 2023: 58 · 2022: 69 · 2021: 66 · 2020: 58 · 2019: 31 · 2018: 11
FWCI
5.46
Type
journal article
Language
en
Open access
Locations
  • Journal of Clinical Investigation (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Ellison Medical Foundation
  • Mayo Clinic (55905)
  • Glenn Foundation for Medical Research
  • Fondation pour la Recherche Médicale
  • National Institutes of Health
  • National Institute on Aging (U01AG006786, R01AG053229, P50AG016574)
Topics
  • Health Sciences › Medicine › Physiology › Telomeres, Telomerase, and Senescence
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Aging › Genetics, Aging, and Longevity in Model Organisms
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
Keywords
cellular senescence, brain aging, neurodegenerative diseases, Parkinson's disease, Alzheimer's disease, senescence-associated secretory phenotype, age-related cognitive impairment, senolytics, senolytic therapy, cell cycle arrest
MeSH terms
Aging, Alzheimer Disease, Brain, Chronic Disease, Humans, Cellular Senescence, Cell Cycle Checkpoints, Cognitive Dysfunction

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