摘要
MnSOD是生物体内重要的氧自由基清除剂,具有抗氧化和抗肿瘤作用。MnSOD基因的表达调控是一个复杂的过程,多种转录因子、细胞信号分子和细胞信号通路参与其中。MnSOD基因的表达调控包括转录调控、转录后调控和翻译调控3个方面。转录调控是MnSOD基因表达调控的第一个层次,在MnSOD基因表达的过程中起重要作用。它主要是通过调节与MnSOD基因转录相关的转录因子活性来实现的,例如特异蛋白-1(SP-1)、激活蛋白-2(AP-2)、激活蛋白-1(AP-1)、核因子-卡巴B(NF-κB)等。药物和金属离子就是通过改变这些转录因子的活性来调控MnSOD基因表达的,另外某些基因的突变和缺失也能改变这些转录因子的活性。转录后调控主要体现在改变mRNA的稳定性或mRNA的翻译上。翻译调控则是对MnSOD多肽的编辑、修饰并与相应的金属离子结合及定位的调控。近年来发现了一种线粒体MnSOD的锰转运因子,它对MnSOD活性的调控起重要作用。文章综述了这一研究领域的一些进展,着重讨论了MnSOD基因的转录调控和翻译调控,并展望了MnSOD基因表达调控的研究方向。
MnSOD, which is an important oxygen free radical scavenger in organisms, has an effect to resist oxidative stress and tumor. The expression and regulation of MnSOD gene is a complicated process, which includes many kinds of transcription factors, cell signal molecules and cell signal pathways. It refers to three aspects including transcription regulation, post-transcription regulation and translation regulation. Transcription regulation is the primary step for MnSOD gene expression and plays a key role during the expression of MnSOD gene. The activity of transcription factors, which controls MnSOD gene expression, such as SP-1, AP-2, AP-1, NF-κB and so on, can be changed in the course of transcription regulation. Drugs and metalions can also affect those transcription factors＇ activity. Furthermore some genes mutation and depletion also have an influence on the activity of those transcription factors. Post-transcription regulation is in a way of chang-hag the stability of mRNA and its translation. Translation regulation is a process to regulate edition, modification, bindind to metalion and site-specific of MnSOD polypeptide. Recently a kind of manganese trafficking factor for mitochondrial MnSOD called MTM1 which is very important for activation of MnSOD has been discovered. Here, we review the advances in this field with an emphasis on transcription regulation and translation regulation of MnSOD gene. And at lasL we discussed the prospect of MnSOD gene expression and regulation.
出处
《遗传》
CAS
CSCD
北大核心
2008年第7期831-837,共7页
Hereditas（Beijing)
基金
国家自然科学基金重点项目(编号:30530570)资助~~
