FOXO3a potentiates hTERT gene expression by activating c-MYC and extends the replicative life-span of human fibroblast.

FOXO3a potentiates hTERT gene expression by activating c-MYC and extends the replicative life-span of human fibroblast.
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DOI:
10.1371/journal.pone.0101864
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发表时间:
2014
期刊:
影响因子:
3.7
通讯作者:
Katakura Y
Katakura Y
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Yamashita S;Ogawa K;Ikei T;Fujiki T;Katakura Y

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在我们以前的研究中,我们报道了SIRT1抑制人成纤维细胞衰老,SIRT1抑制细胞衰老是由于增强了hTERT基因的表达。在这项研究中,我们研究了SIRT1诱导hTERT转录增强的分子机制,表明FOXO3a在SIRT1下游发挥作用,通过增强hTERT基因的表达来阻止细胞衰老。此外,我们发现FOXO3a诱导的hTERT基因表达的增强是以c-myc/E-box依赖的方式调节的。此外,我们还发现FOXO3a与c-myc启动子中的新结合元件结合,这种相互作用激活了c-myc基因的转录。由此产生的c-myc的增加导致c-myc在hTERT启动子中募集到更高水平,进而激活hTERT基因的表达。综上所述,该途径可能构成SIRT1和FOXO3a抗衰老作用的分子基础。
In our previous studies, we reported that SIRT1 prevents cellular senescence in human fibroblast, and that SIRT1-induced inhibition of cellular senescence is due to enhanced hTERT gene expression. In this study, we investigate the molecular mechanisms behind SIRT1-induced potentiation of hTERT transcription and show that FOXO3a functions downstream of SIRT1 and prevents the induction of cellular senescence by enhancing hTERT gene expression. Furthermore, we found that FOXO3a-induced potentiation of hTERT gene expression is regulated in a c-MYC/E-box dependent manner. In addition, we found that FOXO3a binds to the novel binding element in the c-MYC promoter, and this interaction activates the transcription of the c-MYC gene. The resulting increase in c-MYC leads to higher levels of c-MYC recruited to the hTERT promoter and, in turn, activates hTERT gene expression. Taken together, this pathway might constitute the molecular basis for the anti-senescence effects of SIRT1 and FOXO3a.
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