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通过激活BH3-only蛋白Bim,ER压力会触发细胞亡
Hamsa Puthalakath1, Lorraine A O'Reilly, Priscilla Gunn
1The Walter and Eliza Hall Institute of Medical Research, Melbourne, Australia.
Cell
|July 3, 2007
概括
细胞内膜网膜 (ER) 的压力通过激活Bim蛋白来触发细胞死亡. 涉及去化和转录诱导的新途径澄清了ER压力诱导的亡机制.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 由错误折叠的蛋白质或药物引起的内质网膜 (ER) 应激会导致细胞死亡.
- 关联ER压力与细胞亡的确切机制,特别是在退行性疾病中,尚未完全理解.
- 比姆 (Bim) 是一种前性蛋白质,在压力诱导的细胞死亡中起着关键作用,并由各种机制调节.
研究的目的:
- 阐明ER应激诱导亡的分子机制.
- 为了研究Bim在ER中作用和调节的作用,应激诱导的细胞死亡.
- 确定ER与压力相关的疾病的潜在治疗点.
主要方法:
- 利用细胞培养和整个动物模型来研究ER压力诱导的亡.
- 研究了在ER压力条件下Bim蛋白水平和活性的调节.
- 分析了蛋白质酸酶2A (PP2A) 和CHOP-C/EBPalpha在Bim激活中的参与.
主要成果:
- 在各种细胞类型和体内内,Bim对于ER压力诱导的亡至关重要.
- ER应激通过两个新的途径激活Bim:PP2A介导的脱化 (抑制降解) 和CHOP-C/EBPalpha介导的转录诱导.
- 通过PP2A的脱化防止了Bim的无化和蛋白质体降解,而CHOP-C/EBPalpha直接增加了Bim转录.
结论:
- 这项研究定义了通过ER压力通过Bim.引发细胞亡的分子途径.
- 这些发现显示PP2A和CHOP-C/EBPalpha是ER压力中Bim的关键调节者.
- 鉴定的机制为与ER压力相关的疾病提供了潜在的治疗点.
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