Cited by 1,182Telomeres, Telomerase, and SenescenceBone Metabolism and DiseasesBone health and osteoporosis research

Targeting cellular senescence prevents age-related bone loss in mice

Open access
Farr, Joshua N, Xu, Ming, Weivoda, Megan M, Monroe, David G, Fraser, Daniel G, Onken, Jennifer L, Negley, Brittany A, Sfeir, Jad G +10 more·2017·Nature Medicine

Abstract

Aging is associated with increased cellular senescence, which is hypothesized to drive the eventual development of multiple comorbidities. Here we investigate a role for senescent cells in age-related bone loss through multiple approaches. In particular, we used either genetic (i.e., the INK-ATTAC 'suicide' transgene encoding an inducible caspase 8 expressed specifically in senescent cells) or pharmacological (i.e., 'senolytic' compounds) means to eliminate senescent cells. We also inhibited the production of the proinflammatory secretome of senescent cells using a JAK inhibitor (JAKi). In aged (20- to 22-month-old) mice with established bone loss, activation of the INK-ATTAC caspase 8 in senescent cells or treatment with senolytics or the JAKi for 2-4 months resulted in higher bone mass and strength and better bone microarchitecture than in vehicle-treated mice. The beneficial effects of targeting senescent cells were due to lower bone resorption with either maintained (trabecular) or higher (cortical) bone formation as compared to vehicle-treated mice. In vitro studies demonstrated that senescent-cell conditioned medium impaired osteoblast mineralization and enhanced osteoclast-progenitor survival, leading to increased osteoclastogenesis. Collectively, these data establish a causal role for senescent cells in bone loss with aging, and demonstrate that targeting these cells has both anti-resorptive and anabolic effects on bone. Given that eliminating senescent cells and/or inhibiting their proinflammatory secretome also improves cardiovascular function, enhances insulin sensitivity, and reduces frailty, targeting this fundamental mechanism to prevent age-related bone loss suggests a novel treatment strategy not only for osteoporosis, but also for multiple age-related comorbidities.

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Crossref · 10.1038/nm.4385

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  • The introduction argues that senescent cells and their SASP products contribute to deficits in cognition and mobility.

    “Recent evidence suggests that the accumulation of senescent cells, which can release a variety of pro-inflammatory, apoptotic, and toxic by-products, called the senescence-associated secretory phenotype (SASP), is one of the drivers of deficits in both cognition11, 12, 13, 14, 15, 16 and mobility.7,17, 18, 19, 20, 21, 22”

    From A pilot study of senolytics to improve cognition and mobility in older adults at risk for Alzheimer's disease (2025) · cites this paper as [17]

    The paper’s introductory discussion says senescent cells can produce harmful SASP factors, and its concluding discussion notes that targeting senescent cells or their SASP has reduced frailty in old mice. That offers indirect support for the mobility portion of the citing sentence, but this paper studies bone loss, does not measure mobility, and does not address cognitive deficits. The supplied copy provides no page numbers for these passages. (LLM, conf=0.78)

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  • This sterile inflammatory state can impair neighboring and distant non-senescent cells, including progenitors, reducing tissue function and regenerative capacity.

    “This sterile inflammatory state can provoke dysfunction of neighboring and distant non-senescent cells, such as progenitor cells, contributing to impaired tissue function and reduced regenerative capacity18,21,24,26,34.”

    From Cellular senescence and senolytics: the path to the clinic (2022) · cites this paper as [21]

    The paper’s Abstract says the inflammatory senescence-associated secretory phenotype has harmful paracrine and systemic effects and can cause tissue dysfunction. It also reports that senescent-cell-conditioned medium impaired osteoblast mineralization and altered osteoclast progenitor survival. It does not establish reduced regenerative capacity or show that progenitor cells themselves become dysfunctional. (LLM, conf=0.83)

    Experimental — accuracy not yet measured
  • Intermittent senolytic administration appears as effective as continuous treatment for reducing senescent cell burden.

    “With senolytics, intermittent administration appears to be as effective as continuous treatment for attenuating senescent cell burden21.”

    From Cellular senescence and senolytics: the path to the clinic (2022) · cites this paper as [21]

    The treatment passage (indexed as Abstract; page unavailable) reports that once-monthly dasatinib plus quercetin reduced markers of senescent-cell burden in old mice. The Online Methods report similar effects with weekly and biweekly dosing, but the paper does not compare intermittent senolytic dosing with continuous senolytic treatment. The claimed equivalence to continuous treatment is therefore unsupported. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • In aged osteoporotic mice, D+Q reduces bone-resorbing osteoclasts, increases bone-forming osteoblasts, and restores bone mass.

    “In age-related osteoporosis linked to senescent-like osteocytes and bone marrow cells in mice, D + Q reduced development of bone-resorbing osteoclasts, while increasing differentiated bone-forming osteoblasts, with restoration of bone mass21.”

    From Cellular senescence and senolytics: the path to the clinic (2022) · cites this paper as [21]

    The D+Q results (Abstract; page unavailable in our copy) report improved bone microarchitecture and fewer osteoclasts in aged mice. Osteoblast numbers increased on the endocortical surface, but did not change in trabecular bone. The reported osteoclast counts do not establish that D+Q reduced osteoclast development. (LLM, conf=0.85)

    Experimental — accuracy not yet measured
  • Animal data also provide a justification for using P1NP as the primary outcome.

    “although as noted earlier, P1NP could also justifiably have been chosen as our primary outcome based on our animal data13,14.”

    From Effects of intermittent senolytic therapy on bone metabolism in postmenopausal women: a phase 2 randomized controlled trial (2024) · cites this paper as [13]

    The paper reports that clearing senescent cells in old mice maintained trabecular bone formation and increased cortical bone formation (Abstract; page not provided). Those animal findings could motivate a bone-formation outcome, but our copy does not mention P1NP or assess its suitability as a primary outcome. (LLM, conf=0.78)

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Authors
Farr, J. N., Xu, M., Weivoda, M. M., Monroe, D. G., Fraser, D. G., Onken, J. L., Negley, B. A., Sfeir, J. G., Ogrodnik, M. B., Hachfeld, C. M., LeBrasseur, N. K., Drake, M. T., Pignolo, R. J., Pirtskhalava, T., Tchkonia, T., Oursler, M. J., Kirkland, J. L., & Khosla, S.
Affiliations
Mayo Clinic (US)
Corresponding author
  • Kirkland, James L
  • Khosla, Sundeep
Venue
Nature Medicine
Published
2017-08-21
Volume
23
Issue
9
Pages
1072-1079
ISSN
  • 1078-8956 (ISSN-L)
  • 1546-170X
OpenAlex
W2750509325
Cited by
1,182
References
46
Citations by year
2026: 138 · 2025: 140 · 2024: 151 · 2023: 159 · 2022: 135 · 2021: 136 · 2020: 143 · 2019: 105 · 2018: 66 · 2017: 9
FWCI
65.33
Type
journal article
Language
en
Update notices
erratum (2017-11-01)
Open access
Locations
  • Nature Medicine (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • Biotechnology and Biological Sciences Research Council (1369828)
  • National Institute on Aging (R01AG048792, P01AG004875, R01AG013925, R21AG049182, R37AG013925)
  • National Institute of Arthritis and Musculoskeletal and Skin Diseases (R01AR068275, R01AR065402, K01AR070281, K01AR070241, R01AR067129, T32AR056950)
Topics
  • Health Sciences › Medicine › Physiology › Telomeres, Telomerase, and Senescence
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Bone Metabolism and Diseases
  • Health Sciences › Medicine › Orthopedics and Sports Medicine › Bone health and osteoporosis research
Keywords
cellular senescence, age-related bone loss, osteoporosis, senolytics, senolytic therapy, caspase-8, JAK inhibitors, senescence-associated secretome, bone resorption, osteoclastogenesis, osteoblast mineralization, bone microarchitecture, bone strength, aging
MeSH terms
Cortical Bone, Cancellous Bone, Animals, beta-Galactosidase, Bone and Bones, Cell Differentiation, Flow Cytometry, Mice, Transgenic, Nitriles, Osteoblasts, Osteoclasts, Osteocytes, Osteoporosis, Pyrazoles, Pyrimidines, Absorptiometry, Photon, Weight-Bearing, Cellular Senescence, Culture Media, Conditioned, Apoptosis, Gene Expression Profiling, Mice, Caspase 8, Janus Kinases, Real-Time Polymerase Chain Reaction, In Vitro Techniques

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