Cited by 192Bone Metabolism and DiseasesTelomeres, Telomerase, and SenescenceMesenchymal stem cell research

DNA damage and senescence in osteoprogenitors expressing Osx1 may cause their decrease with age

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Kim, Ha‐Neui, Chang, Jianhui, Shao, Lijian, Han, Li, Iyer, Srividhya, Manolagas, Stavros C., O'Brien, Charles A., Jilka, Robert L. +2 more·2017·Aging Cell

Abstract

Summary Age‐related bone loss in mice results from a decrease in bone formation and an increase in cortical bone resorption. The former is accounted by a decrease in the number of postmitotic osteoblasts which synthesize the bone matrix and is thought to be the consequence of age‐dependent changes in mesenchymal osteoblast progenitors. However, there are no specific markers for these progenitors, and conclusions rely on results from in vitro cultures of mixed cell populations. Moreover, the culprits of such changes remain unknown. Here, we have used Osx1‐Cre;TdRFP mice in which osteoprogenitors express the TdRFP fluorescent protein. We report that the number of TdRFP‐Osx1 cells, freshly isolated from the bone marrow, declines by more than 50% between 6 and 24 months of age in both female and male mice. Moreover, TdRFP‐Osx1 cells from old mice exhibited markers of DNA damage and senescence, such as γH2AX foci, G1 cell cycle arrest, phosphorylation of p53, increased p21CIP1 levels, as well as increased levels of GATA4 and activation of NF‐κB – two major stimulators of the senescence‐associated secretory phenotype (SASP). Bone marrow stromal cells from old mice also exhibited elevated expression of SASP genes, including several pro‐osteoclastogenic cytokines, and increased capacity to support osteoclast formation. These changes were greatly attenuated by the senolytic drug ABT263. Together, these findings suggest that the decline in bone mass with age is the result of intrinsic defects in osteoprogenitor cells, leading to decreased osteoblast numbers and increased support of osteoclast formation.

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  • Senescent cells play an important role in skeletal aging in part by decreasing osteoprogenitor cell number and the generation of osteoblasts that produce the bone matrix, and by stimulating osteoclastogenesis to resorb the bone.

    “Recent studies by us and others have shown that SCs play an important role in skeletal aging in part by decreasing osteoprogenitor cell number and the generation of osteoblasts that produce the bone matrix; stimulate osteoclastogenesis to resorb the bone42,43.”
  • PZ might be slightly more effective than ABT263 in clearance of senescent BM osteoblast progenitors in naturally aged mice because these progenitors undergo senescence in a p21-dependent, but p16-independent, manner.

    “This result suggests that PZ might be slightly more effective than ABT263 in clearance of senescent BM osteoblast progenitors in naturally aged mice because these progenitors undergo senescence in a p21-dependent, but p16-independent, manner42.”

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Authors
Kim, H., Chang, J., Shao, L., Han, L., Iyer, S., Manolagas, S. C., O'Brien, C. A., Jilka, R. L., Zhou, D., & Almeida, M.
Affiliations
  • Central Arkansas Veterans Healthcare System (US)
  • University of Arkansas for Medical Sciences (US)
  • Division of Endocrinology and Metabolism Center for Osteoporosis and Metabolic Bone Diseases University of Arkansas for Medical Sciences Little Rock AR USA
Corresponding author
Almeida, Maria
Venue
Aging Cell
Publisher
Wiley
Published
2017-04-12
Volume
16
Issue
4
Pages
693-703
ISSN
  • 1474-9718 (ISSN-L)
  • 1474-9726
OpenAlex
W2606663768
Cited by
192
References
62
Citations by year
2026: 11 · 2025: 16 · 2024: 17 · 2023: 17 · 2022: 25 · 2021: 39 · 2020: 23 · 2019: 24 · 2018: 16 · 2017: 3
FWCI
7.38
Type
journal article
Language
en
Open access
Locations
  • Aging Cell (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
National Institutes of Health (R01 AR56679, R01 CA122023, P01 AG13918)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Bone Metabolism and Diseases
  • Health Sciences › Medicine › Physiology › Telomeres, Telomerase, and Senescence
  • Health Sciences › Medicine › Genetics › Mesenchymal stem cell research
Keywords
osteoprogenitor cells, cellular senescence, DNA damage, age-related bone loss, mesenchymal stem cells, senescence-associated secretory phenotype, osteoclastogenesis, osteoblast progenitors, p53, GATA4, NF-κB, senolytics, navitoclax, G1 cell cycle arrest
MeSH terms
Sp7 Transcription Factor, Red Fluorescent Protein, Aging, Aniline Compounds, Animals, Bone and Bones, Cell Differentiation, DNA Damage, Female, Gene Expression Regulation, Histones, Luminescent Proteins, Male, Mice, Transgenic, Osteoblasts, Osteoclasts, Osteogenesis, Osteoporosis, Sulfonamides, Signal Transduction, Tumor Suppressor Protein p53, NF-kappa B, Genes, Reporter, Cyclin-Dependent Kinase Inhibitor p21, GATA4 Transcription Factor, Mice, G1 Phase Cell Cycle Checkpoints, Mesenchymal Stem Cells, Primary Cell Culture

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