Sirt6 overexpression suppresses senescence and apoptosis of nucleus pulposus cells by inducing autophagy in a model of intervertebral disc degeneration.

Sirt6 overexpression suppresses senescence and apoptosis of nucleus pulposus cells by inducing autophagy in a model of intervertebral disc degeneration.
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Sirt6 过表达通过诱导椎间盘退变模型中的自噬抑制髓核细胞的衰老和凋亡

DOI:
10.1038/s41419-017-0085-5
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发表时间:
2018-01-19
影响因子:
9
通讯作者:
Wu YS
Wu YS
中科院分区:
生物学1区
文献类型:
--
作者:
Chen J;Xie JJ;Jin MY;Gu YT;Wu CC;Guo WJ;Yan YZ;Zhang ZJ;Wang JL;Zhang XL;Lin Y;Sun JL;Zhu GH;Wang XY;Wu YS

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椎间盘退变(IDD)的治疗旨在防止髓核(NP)细胞衰老和死亡。先前的研究表明,在年龄相关性退行性疾病模型中,Sirt6具有强大的抗衰老和抗凋亡作用。然而,目前尚不清楚Sirt6是否对椎间盘退变有保护作用。在此,我们探究了Sirt6是否会影响椎间盘退变。在衰老的人髓核细胞中,Sirt6水平降低。过表达Sirt6可抵御细胞凋亡以及复制性衰老和应激诱导的早衰。Sirt6还能在体内和体外激活髓核细胞的自噬。3-甲基腺嘌呤(3-MA)和氯喹(CQ)介导的自噬抑制作用部分逆转了Sirt6的抗衰老和抗凋亡作用,而Sirt6可调节退变相关蛋白的表达。在体内,过表达Sirt6可减轻椎间盘退变。总体而言,这些数据表明,Sirt6通过触发自噬减轻细胞衰老并减少细胞凋亡,最终改善椎间盘退变。因此,Sirt6可能是椎间盘退变治疗的一个新的治疗靶点。
Treatment of intervertebral disc degeneration (IDD) seeks to prevent senescence and death of nucleus pulposus (NP) cells. Previous studies have shown that sirt6 exerts potent anti-senescent and anti-apoptotic effects in models of age-related degenerative disease. However, it is not known whether sirt6 protects against IDD. Here, we explored whether sirt6 influenced IDD. The sirt6 level was reduced in senescent human NP cells. Sirt6 overexpression protected against apoptosis and both replicative and stress-induced premature senescence. Sirt6 also activated NP cell autophagy both in vivo and in vitro. 3-methyladenine (3-MA) and chloroquine (CQ)-mediated inhibition of autophagy partially reversed the anti-senescent and anti-apoptotic effects of sirt6, which regulated the expression of degeneration-associated proteins. In vivo, sirt6 overexpression attenuated IDD. Together, the data showed that sirt6 attenuated cell senescence, and reduced apoptosis, by triggering autophagy that ultimately ameliorated IDD. Thus, sirt6 may be a novel therapeutic target for IDD treatment.
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