线粒体Stat3在细胞呼吸中的功能
Joanna Wegrzyn1, Ramesh Potla, Yong-Joon Chwae
1Department of Biochemistry and Molecular Biology and Massey Cancer Center, Virginia Commonwealth University, Richmond, VA 23298, USA.
Science (New York, N.Y.)
|January 10, 2009
概括
信号转换器和转录3激活器 (Stat3) 存在于线粒体中,对电子传输链 (ETC) 至关重要. 缺少Stat3会损害ETC复杂活动,影响细胞平衡.
科学领域:
- 线粒体生物学 线粒体生物学
- 蜂信号传输是如何进行的
- 生物化学 生物化学
背景情况:
- 干白素-6 (IL-6) 信号激活信号转换器和转录3 (Stat3) 的激活器通过酸化,调节基因表达.
- Stat3主要以其作为转录因子在细胞核中的作用而闻名.
- 线粒体功能障碍与各种病理有关.
研究的目的:
- 调查Stat3超出其核功能之外的作用.
- 为了确定Stat3是否局部化到线粒体并影响线粒体功能.
- 阐明Stat3对电子传输链 (ETC) 的影响.
主要方法:
- 细胞培养和初级组织分析以检测Stat3局部化.
- 生物化学试验测量ETC复合物I和II的活性.
- 产生和分析Stat3淘汰细胞和小鼠.
- 局部定向的突变发生,以产生具有不同功能的Stat3变体.
主要成果:
- 在培养细胞的线粒体和肝脏和心脏组织中检测到Stat3.
- 缺乏Stat3的细胞显示ETC复合物I和II的活性显著降低.
- 在转录和ETC活动中,Stat3突变体表现出可分离的功能.
- 心脏中缺乏Stat3的小鼠在ETC复合体I和II活动中表现出特定的缺陷.
结论:
- Stat3 在线粒体中起着关键的非转录性作用.
- Stat3对于电子运输链的最佳功能至关重要.
- 通过其线粒体功能,Stat3可以协调细胞反应以维持恒常状态.
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