SIRT1与肿瘤发生

摘要

Sirtuin l（SIRT1）inactivates proteins involved in tumor suppression and DNA damage repair ）by deacetylation and it has long been considered as a tumor promoter. However, recent studies demonstrated that SIRT1 expression levels are reduced in some other types of cancers, and that SIRT1 deficiency results in genetic instability and tumorigenesis,while overexpression of SIRT1 attenuates cancer formation. The dual role that SIRT1 plays may depend on the temporal and special distribution of different SIRT1 upand downstream factors in different tissue contexts.%SIRT1（sirtuin 1）通过对肿瘤抑制蛋白和DNA损伤修复蛋白去乙酰化而使之失活。因此,SIRT1早期被认为是肿瘤促进因子。近来研究又表明SIRT1在某些肿瘤中表达降低且SIRT1缺乏导致遗传不稳定和肿瘤发生。超表达SIRT1可降低癌变风险。SIRT1的这种双重作用可能与其组织中SIRT1上游和下游因子的时空分布不同有关。