p21 both attenuates and drives senescence and aging in BubR1 progeroid mice.

p21 both attenuates and drives senescence and aging in BubR1 progeroid mice.
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DOI:
10.1016/j.celrep.2013.03.028
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发表时间:
2013-04-25
期刊:
影响因子:
8.8
通讯作者:
van Deursen JM
van Deursen JM
中科院分区:
生物学1区
文献类型:
--
作者:
Baker DJ;Weaver RL;van Deursen JM

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BubR1功能不全发生在自然衰老中,并诱导小鼠和患有马赛克杂色非整倍体综合征的儿童的早衰样表型。作为对BubR1不足的响应,骨骼肌、脂肪和透镜组织与p19 Arf结合以减弱衰老和与年龄相关的退化。在这里,我们解决如何p19Arf发挥这一看守人的作用,使用BubR1 progeroid小鼠缺乏p53或其转录靶点p21。我们发现,p53通过抑制p16Ink4a介导的祖细胞衰老,以p21依赖的方式延迟骨骼肌和脂肪的功能衰退。值得注意的是,p53也减弱了白内障晶状体的形成,但在这里它的抗衰老作用是p21独立的,因为我们发现p21促进透镜上皮细胞的衰老和白内障的形成。总之,这些结果表明,p53通过不同的机制抵消了响应于BubR1不足的组织破坏,并揭示了祖细胞室衰老和年龄相关功能障碍之间的因果关系。
BubR1 insufficiency occurs with natural aging and induces progeroid phenotypes in both mice and children with mosaic variegated aneuploidy syndrome. In response to BubR1 insufficiency, skeletal muscle, fat, and lens tissue engage p19Arf to attenuate senescence and age-related deterioration. Here, we address how p19Arf exerts this caretaker role using BubR1 progeroid mice lacking p53 or its transcriptional target p21. We show that p53 delays functional decline of skeletal muscle and fat in a p21-dependent fashion by inhibiting p16Ink4a-mediated senescence of progenitor cells. Strikingly, p53 also attenuates the formation of cataractous lenses, but here its antiaging effect is p21 independent, as we found p21 to promote senescence of lens epithelial cells and cataract formation. Together, these results demonstrate that p53 counteracts tissue destruction in response to BubR1 insufficiency through diverse mechanisms and uncover a causal link between senescence of the progenitor cell compartment and age-related dysfunction.
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