SIRT1 ameliorates age-related senescence of mesenchymal stem cells via modulating telomere shelterin.

SIRT1 ameliorates age-related senescence of mesenchymal stem cells via modulating telomere shelterin.
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SIRT1 通过调节端粒庇护蛋白改善间充质干细胞的年龄相关衰老

DOI:
10.3389/fnagi.2014.00103
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发表时间:
2014
影响因子:
4.8
通讯作者:
Wang J
Wang J
中科院分区:
医学2区
文献类型:
--
作者:
Chen H;Liu X;Zhu W;Chen H;Hu X;Jiang Z;Xu Y;Wang L;Zhou Y;Chen P;Zhang N;Hu D;Zhang L;Wang Y;Xu Q;Wu R;Yu H;Wang J

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间充质干细胞(MSC)衰老是一个与年龄相关的过程,损害了组织修复的能力,并损害了自体MSC用于组织再生的临床应用。在这里,我们描述了SIRT1,NAD+依赖性脱乙酰酶,对年龄相关的MSC衰老的影响。在年轻MSC中敲低SIRT1诱导细胞衰老并抑制细胞增殖,而在老年MSC中过表达SIRT1逆转衰老表型并刺激细胞增殖。这些结果表明SIRT1在调节年龄诱导的MSC衰老中起关键作用。衰老相关蛋白P16和P21可能是SIRT1介导的抗衰老作用的下游效应物。SIRT1保护MSCs免受年龄相关的DNA损伤,诱导端粒酶逆转录酶(TERT)表达,增强端粒酶活性,但不影响端粒长度。SIRT1正调控三肽基肽酶1(TPP1)的表达,TPP1是保护染色体末端免受DNA损伤的shelterin途径的一个组成部分。总之,结果表明SIRT1通过增强TPP1表达,增加端粒酶活性和减少DNA损伤等机制淬灭与年龄相关的MSC衰老。
Mesenchymal stem cells (MSCs) senescence is an age-related process that impairs the capacity for tissue repair and compromises the clinical use of autologous MSCs for tissue regeneration. Here, we describe the effects of SIRT1, a NAD+-dependent deacetylase, on age-related MSCs senescence. Knockdown of SIRT1 in young MSCs induced cellular senescence and inhibited cell proliferation whereas overexpression of SIRT1 in aged MSCs reversed the senescence phenotype and stimulated cell proliferation. These results suggest that SIRT1 plays a key role in modulating age-induced MSCs senescence. Aging-related proteins, P16 and P21 may be downstream effectors of the SIRT1-mediated anti-aging effects. SIRT1 protected MSCs from age-related DNA damage, induced telomerase reverse transcriptase (TERT) expression and enhanced telomerase activity but did not affect telomere length. SIRT1 positively regulated the expression of tripeptidyl peptidase 1 (TPP1), a component of the shelterin pathway that protects chromosome ends from DNA damage. Together, the results demonstrate that SIRT1 quenches age-related MSCs senescence by mechanisms that include enhanced TPP1 expression, increased telomerase activity and reduced DNA damage.
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