title: Knockdown of SIRT6 Enables Human Bone Marrow Mesenchymal Stem Cell Senescence.
abstract: Autologous bone marrow mesenchymal stem cell (BM-MSC) transplantation is a novel strategy for treating ischemic heart disease. However, limited benefits have been reported in aging patients. Rejuvenation of aged human BM-MSCs (hBM-MSCs) could be a means to improve the efficacy of stem cell transplantation in older patients. While it has been shown that sirtuin 6 (SIRT6) is an important antiaging factor in various cells, the role of SIRT6 in hBM-MSCs remains unknown. The hBM-MSCs from different ages were cultured for quantifying SIRT6 expression by mRNA and Western blotting. The cell proliferative and migration abilities were evaluated by BrdU staining, cell growth curves, and scratch assay. Senescence-associated β-galactosidase (SA-β-Gal) activity and aging-associated p16 (cyclin-dependent kinase inhibitor 2A) expression were also quantified. The knockdown of SIRT6 in hBM-MSCs was used to investigate its impact on aging. SIRT6 expression increased with age, while the proliferative and migration abilities of aged hBM-MSCs were decreased compared with young cells. Knockdown of SIRT6 impaired the proliferative, migration, and oxidative stress resistance potentials of BM-MSCs. SA-β-Gal activity and p16 expression were increased in aged cells compared with young ones and in siRNA SIRT6 knockdown cells compared with their controls. Aging results in compensatory overexpression of SIRT6 in hBM-MSCs. Downregulation of SIRT6 in these cells resulted in less cell proliferation and migration but increased SA-β-Gal activity and p16 expression. These results suggest that SIRT6 regulates the aging process in hBM-MSCs and could serve as a target for their rejuvenation.
authors.affiliation: 1 Department of Biochemistry and Molecular Biology, Shanxi Key Laboratory of Birth Defect and Cell Regeneration, Shanxi Medical University , Taiyuan, China .|2 Department of Anatomy, Shanxi Chinese Traditional Medical University , Taiyuan, China .
authors.forename: Xiao-Yan
authors.initials: XY
authors.lastname: Zhai
authors.affiliation: 1 Department of Biochemistry and Molecular Biology, Shanxi Key Laboratory of Birth Defect and Cell Regeneration, Shanxi Medical University , Taiyuan, China .
authors.forename: Ping
authors.initials: P
authors.lastname: Yan
authors.affiliation: 1 Department of Biochemistry and Molecular Biology, Shanxi Key Laboratory of Birth Defect and Cell Regeneration, Shanxi Medical University , Taiyuan, China .
authors.forename: Jie
authors.initials: J
authors.lastname: Zhang
authors.affiliation: 1 Department of Biochemistry and Molecular Biology, Shanxi Key Laboratory of Birth Defect and Cell Regeneration, Shanxi Medical University , Taiyuan, China .
authors.forename: Hui-Fang
authors.initials: HF
authors.lastname: Song
authors.affiliation: 1 Department of Biochemistry and Molecular Biology, Shanxi Key Laboratory of Birth Defect and Cell Regeneration, Shanxi Medical University , Taiyuan, China .
authors.forename: Wen-Juan
authors.initials: WJ
authors.lastname: Yin
authors.affiliation: 1 Department of Biochemistry and Molecular Biology, Shanxi Key Laboratory of Birth Defect and Cell Regeneration, Shanxi Medical University , Taiyuan, China .
authors.forename: Hui
authors.initials: H
authors.lastname: Gong
authors.affiliation: 3 Department of Critical Care Medicine, The Second Hospital, Shanxi Medical University , Taiyuan, China .
authors.forename: Hao
authors.initials: H
authors.lastname: Li
authors.affiliation: 4 Division of Cardiovascular Surgery, Toronto General Research Institute, University Health Network , Toronto, Canada .
authors.forename: Jun
authors.initials: J
authors.lastname: Wu
authors.affiliation: 1 Department of Biochemistry and Molecular Biology, Shanxi Key Laboratory of Birth Defect and Cell Regeneration, Shanxi Medical University , Taiyuan, China .
authors.forename: Jun
authors.initials: J
authors.lastname: Xie
authors.affiliation: 4 Division of Cardiovascular Surgery, Toronto General Research Institute, University Health Network , Toronto, Canada .
authors.forename: Ren-Ke
authors.initials: RK
authors.lastname: Li