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Sirt1 ameliorates systemic sclerosis by targeting the mTOR pathway.

Abstract：

BACKGROUND:Systemic sclerosis (SSc) is a chronic autoimmune disease characterized by inflammation and fibrosis. Our previous research has indicated that Sirtuin1 (Sirt1) plays a role in the regulation of TNF-α-induced inflammation; however, whether Sirt1 may inhibit the progress of SSc by blocking inflammation remains unknown. OBJECTIVE:We aimed to investigate the function of Sirt1 in SSc. METHODS:The function and its mechanism of Sirt1 were evaluated in fibroblasts or scleroderma mice. The expression of Sirt1 and cytokines was analyzed using real-time PCR, western blot, ELISA and immunohistochemistry. RESULTS:We determined that fibroblasts of SSc patients were activated to exhibit inflammation. Sirt1, activated by resveratrol (Res), ameliorated cutaneous inflammation and fibrosis in bleomycin (BLM)-induced scleroderma mice. An improvement in mammalian target of rapamycin (mTOR) was identified in the fibroblasts of SSc patients and the skin lesions of BLM mice. Rapamycin, an mTOR specific inhibitor, substantially inhibited the induced inflammation and fibrosis. The enhancement of mTOR expression in the skin lesions of the BLM-treated mice was significantly inhibited by Sirt1 activation. However, in both the BLM-treated cells and mice, Res exerted an inhibitory function on the expression of inflammatory factors, and collagen was diminished following mTOR knockdown. These findings suggest that Res may inhibit inflammation and fibrosis via mTOR. CONCLUSION:The modulation of Sirt1 activity may represent a potential therapeutic method for SSc. The mechanism may involve the inhibition of mTOR phosphorylation, whereas mTOR activity was shown to be a pathogenic culprit of SSc.

journal_name

J Dermatol Sci

journal_title

Journal of dermatological science

authors

Zhu X,Chu H,Jiang S,Liu Q,Liu L,Xue Y,Zheng S,Wan W,Qiu J,Wang J,Zou H

doi

10.1016/j.jdermsci.2017.04.013

subject

Has Abstract

pub_date

2017-08-01 00:00:00

pages

149-158

issue

2

eissn

0923-1811

issn

1873-569X

pii

S0923-1811(16)31017-9

journal_volume

87

pub_type

杂志文章

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