期刊
AGING CELL
卷 21, 期 5, 页码 -出版社
WILEY
DOI: 10.1111/acel.13602
关键词
bone; radiation; senescence
资金
- National Cancer Institute [1UG3CA26810-01]
- National Center for Advancing Translational Sciences [UL1TR002377]
- National Institute on Aging [P01 AG062413, R01 AG063707, R01AG063543, R01AG068048, U19AG056278]
- National Institute of Diabetes and Digestive and Kidney Diseases [R01 DK128552]
This study demonstrates that cellular senescence-driven radiation-induced osteoporosis is primarily mediated by p21(Cip1) rather than p16(Ink4a), based on the clearance of senescent cells using genetic models. This approach may be used to investigate the contributions of these pathways in other senescence-associated conditions, including aging across tissues.
Cellular senescence, which is a major cause of tissue dysfunction with aging and multiple other conditions, is known to be triggered by p16(Ink4a) or p21(Cip1), but the relative contributions of each pathway toward inducing senescence are unclear. Here, we directly addressed this issue by first developing and validating a p21-ATTAC mouse with the p21(Cip1) promoter driving a suicide transgene encoding an inducible caspase-8 which, upon induction, selectively kills p21(Cip1)-expressing senescent cells. Next, we used the p21-ATTAC mouse and the established p16-INK-ATTAC mouse to directly compare the contributions of p21(Cip1) versus p16(Ink4a) in driving cellular senescence in a condition where a tissue phenotype (bone loss and increased marrow adiposity) is clearly driven by cellular senescence-specifically, radiation-induced osteoporosis. Using RNA in situ hybridization, we confirmed the reduction in radiation-induced p21(Cip1)- or p16(Ink4a)-driven transcripts following senescent cell clearance in both models. However, only clearance of p21(Cip1)+, but not p16(Ink4a)+, senescent cells prevented both radiation-induced osteoporosis and increased marrow adiposity. Reduction in senescent cells with dysfunctional telomeres following clearance of p21(Cip1)+, but not p16(Ink4a)+, senescent cells also reduced several of the radiation-induced pro-inflammatory senescence-associated secretory phenotype factors. Thus, by directly comparing senescent cell clearance using two parallel genetic models, we demonstrate that radiation-induced osteoporosis is driven predominantly by p21(Cip1)- rather than p16(Ink4a)-mediated cellular senescence. Further, this approach can be used to dissect the contributions of these pathways in other senescence-associated conditions, including aging across tissues.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据