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

被引：106

作者：

Chen, Huiqiang ^{[1
,2
]}

Liu, Xianbao ^{[1
,2
]}

Zhu, Wei ^{[2
]}

Chen, Han ^{[1
,2
]}

Hu, Xinyang ^{[1
,2
]}

Jiang, Zhi ^{[1
,2
]}

Xu, Yinchuan ^{[1
,2
]}

Wang, Lihan ^{[1
,2
]}

Zhou, Yu ^{[1
,2
]}

Chen, Panpan ^{[1
,2
]}

Zhang, Na ^{[1
,2
]}

Hu, Dexing ^{[1
,2
]}

Zhang, Ling ^{[2
]}

Wang, Yaping ^{[1
,2
]}

Xu, Qiyuan ^{[1
,2
]}

Wu, Rongrong ^{[2
]}

Yu, Hong ^{[2
]}

Wang, Jian'an ^{[1
,2
]}

机构：

[1] Zhejiang Univ, Coll Med, Affiliated Hosp 2, Dept Cardiol, Hangzhou 310009, Zhejiang, Peoples R China

[2] Zhejiang Univ, Coll Med, Affiliated Hosp 2, Key Lab Cardiovasc Dis, Hangzhou 310009, Zhejiang, Peoples R China

来源：

FRONTIERS IN AGING NEUROSCIENCE | 2014年 / 6卷

基金：

中国国家自然科学基金;

关键词：

mesenchymal stem cells; SIRT1; aging; senescence; telomerase; shelterin; TPP1; CELLULAR SENESCENCE; GENOMIC STABILITY; TPP1; MAINTENANCE; EXPRESSION; COMPLEX; BONE; ADIPOGENESIS; LOCALIZATION; ACETYLATION;

D O I：

10.3389/fnagi.2014.00103

中图分类号：

R592 [老年病学]; C [社会科学总论];

学科分类号：

030301 [社会学]; 100201 [内科学];

摘要：

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.

引用

页数：12

共 57 条

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TIN2-Tethered TPP1 Recruits Human Telomerase to Telomeres In Vivo [J].