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热冲击转录因子1保护心肌细胞免受缺血/反损伤的影响
Yunzeng Zou1, Weidong Zhu, Masaya Sakamoto
1Department of Cardiovascular Science and Medicine, Chiba University, Graduate School of Medicine, 1-8-1 Inohana, Chuo-ku, Chiba 260-8670, Japan. komuro-tky@umin.ac.jp
Circulation
|November 19, 2003
概括
热冲击转录因子1 (HSF1) 保护心脏细胞免于死亡. 这一发现提供了通过识别保护分子来对抗心力衰竭的新方法.
科学领域:
- 心脏病学 心脏病学
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
背景情况:
- 心肌细胞死亡是心力衰竭的主要原因.
- 识别保护心肌细胞的分子对于开发治疗方法至关重要.
- "死亡陷"方法在发现细胞保护基因方面是有效的.
研究的目的:
- 用"死亡陷"方法识别保护心肌细胞免受死亡的新型分子.
- 研究热冲击转录因子1 (HSF1) 在心肌细胞存活中的作用.
主要方法:
- 使用"死亡陷"方法来选保护分子.
- 在COS7细胞中过度表达的HSF1,以评估对过氧化诱导的细胞死亡的保护.
- 研究了HSF1激活通过热预约对氧化应激下心肌细胞存活的影响.
- 检查了心脏功能和病理在转基因小鼠过度表达一个构成性活跃的HSF1后缺血-再输血损伤.
主要成果:
- HSF1被确定为一个关键的保护分子.
- 在COS7细胞中,HSF1过度表达阻止了过氧化诱导的细胞死亡.
- 热预条件激活HSF1,增强心肌细胞对抗氧化应激的存活率.
- 与野生类型小鼠相比,过度表达HSF1的转基因小鼠显示出更快的ECG恢复,减少了心脏病发作的大小,并且在缺血症再输血后心肌细胞死亡较少.
- HSF1激活与蛋白激酶B/Akt的增加以及Jun N-终端激酶和caspase 3活性的降低相关.
结论:
- HSF1在保护心肌细胞免于死亡方面发挥着至关重要的作用.
- 通过HSF1介导的保护包括Akt信号通路的激活.
- HSF1通过抑制亲细胞灭亡途径,包括Jun N-终端激酶和caspase 3等,提供心脏保护.
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