Yu Fa-Xing, Dai Ru-Ping, Goh Shuang-Ru, Zheng Lei, Luo Yan
Institute of Molecular and Cell Biology, Singapore, Singapore.
Cell Cycle. 2009 Mar 1;8(5):773-9. doi: 10.4161/cc.8.5.7880. Epub 2009 Mar 18.
Many biological activities naturally oscillate. Here, we show that the NAD(+)/NADH ratios (redox status) fluctuate during mammalian cell cycle, with the S-phase redox status being the least oxidative. The S-phase NAD(+)/NADH redox status gates histone expression and S-phase progression, and may provide a genome protection mechanism during S-phase DNA replication as implicated in yeast. Accordingly, perturbing the cellular redox inhibits histone expression and leads to S-phase arrest. We propose that the S-phase NAD(+)/NADH redox status constitutes a redox signaling, which along with the cyclin E/cdk2 signaling regulates histone expression and S-phase progression.
许多生物活动自然地呈周期性变化。在此,我们表明,在哺乳动物细胞周期中,NAD(+)/NADH比率(氧化还原状态)会发生波动,其中S期的氧化还原状态氧化性最低。S期的NAD(+)/NADH氧化还原状态控制组蛋白表达和S期进程,并且可能如在酵母中所涉及的那样,在S期DNA复制过程中提供一种基因组保护机制。因此,干扰细胞氧化还原会抑制组蛋白表达并导致S期停滞。我们提出,S期的NAD(+)/NADH氧化还原状态构成一种氧化还原信号,其与细胞周期蛋白E/细胞周期蛋白依赖性激酶2信号一起调节组蛋白表达和S期进程。