SIRT1 Ameliorates Age-related Senescence of Mesenchymal Stem Cells Via Modulating Telomere Shelterin

Overview

Journal Front Aging Neurosci

Specialty Geriatrics

Date 2014 Jun 12

PMID 24917814

Citations 60

Authors

Huiqiang Chen

Xianbao Liu

Wei Zhu

Han Chen

Xinyang Hu

Zhi Jiang

Yinchuan Xu

Lihan Wang

Yu Zhou

Panpan Chen

Na Zhang

Dexing Hu

Ling Zhang

Yaping Wang

Qiyuan Xu

Rongrong Wu

Hong Yu

Jianan Wang

Affiliations

Soon will be listed here.

Abstract

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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