SIRT1 is regulated by a PPAR{γ}-SIRT1 negative feedback loop associated with senescence.

SIRT1 is regulated by a PPAR{γ}-SIRT1 negative feedback loop associated with senescence.
复制标题

DOI:
10.1093/nar/gkq609
复制
发表时间:
2010-11
影响因子:
14.9
通讯作者:
Tong T
Tong T
中科院分区:
生物学2区
文献类型:
--
作者:
Han L;Zhou R;Niu J;McNutt MA;Wang P;Tong T

文献摘要

参考文献

被引文献

相似文献

人类沉默信息调节因子1(SIRT1)是一种依赖NAD+的脱乙酰基酶蛋白,在基因沉默和衰老过程中是细胞代谢的中介。SIRT1已被广泛研究并被证明具有延缓衰老的作用,然而,对SIRT1在衰老过程中的调控知之甚少。在本研究中,我们发现过氧化物酶体增殖物激活受体γ(PPARγ)是一种受配体调控的模块化核受体,它调控脂肪细胞的分化并抑制细胞增殖,在转录水平上抑制SIRT1的表达。此外,PPARγ和sirt1都能与sirt1启动子结合。PPARγ直接与SIRT1相互作用,抑制SIRT1活性,形成负反馈和自我调节环路。此外,我们的数据显示,随着细胞传代次数的增加,PPARγ的乙酰化程度增加。我们认为,在细胞衰老过程中,PPARγ受p300和sirt1的乙酰化和去乙酰化调控。这些结果证明了PPARγ和SIRT1之间的相互调节,并发现了一种新的影响细胞衰老的翻译后修饰。
Human Silent Information Regulator Type 1 (SIRT1) is an NAD+-dependent deacetylase protein which is an intermediary of cellular metabolism in gene silencing and aging. SIRT1 has been extensively investigated and shown to delay senescence; however, less is known about the regulation of SIRT1 during aging. In this study, we show that the peroxisome proliferator-activated receptor-γ (PPARγ), which is a ligand-regulated modular nuclear receptor that governs adipocyte differentiation and inhibits cellular proliferation, inhibits SIRT1 expression at the transcriptional level. Moreover, both PPARγ and SIRT1 can bind the SIRT1 promoter. PPARγ directly interacts with SIRT1 and inhibits SIRT1 activity, forming a negative feedback and self-regulation loop. In addition, our data show that acetylation of PPARγ increased with increasing cell passage number. We propose that PPARγ is subject to regulation by acetylation and deacetylation via p300 and SIRT1 in cellular senescence. These results demonstrate a mutual regulation between PPARγ and SIRT1 and identify a new posttranslational modification that affects cellular senescence.
DOI: 10.1242/jcs.026633
发表时间: 2008-07-01
影响因子: 4
作者:
Gan, Qini;Huang, Jing;Tong, Tanjun
通讯作者: Tong, Tanjun
DOI: 10.1073/pnas.92.20.9363
发表时间: 1995-09-26
影响因子: 11.1
作者:
DIMRI, GP;LEE, XH;CAMPISI, J
通讯作者: CAMPISI, J
DOI: 10.1074/jbc.m203423200
发表时间: 2002-07-19
影响因子: 4.8
作者:
Gaughan, L;Logan, IR;Robson, CN
通讯作者: Robson, CN
DOI: 10.1093/emboj/19.4.662
发表时间: 2000-02-15
期刊: EMBO JOURNAL
影响因子: 11.4
作者:
Martínez-Balbás, MA;Bauer, UM;Kouzarides, T
通讯作者: Kouzarides, T
DOI: 10.1038/nature03354
发表时间: 2005-03-03
期刊: NATURE
影响因子: 64.8
作者:
Rodgers, JT;Lerin, C;Puigserver, P
通讯作者: Puigserver, P