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细胞内膜网膜应激激活了CREBH的分裂,从而诱导了全身炎症反应
Kezhong Zhang1, Xiaohua Shen, Jun Wu
1Department of Biological Chemistry, University of Michigan Medical Center, Ann Arbor, MI 48109, USA.
Cell
|February 14, 2006
概括
肝脏特异性转录因子CREBH在细胞内网膜 (ER) 应激过程中被分裂. 这种分裂激活了急性阶段反应 (APR) 基因,将ER压力与炎症联系起来.
科学领域:
- 分子生物学分子生物学
- 细胞应激反应的应激反应
- 免疫学 免疫学 免疫学
背景情况:
- 调节的内膜蛋白解 (RIP) 控制了内质网膜 (ER) 内膜的转录因子,影响了固醇稳态和未折叠的蛋白质反应 (UPR).
- 特定转录因子在调解ER压力诱导的炎症基因表达中的作用仍然不完全理解.
研究的目的:
- 识别和表征一种涉及急性阶段反应 (APR) 的新型ER局部转录因子.
- 阐明ER应激激活APR基因转录的机制.
主要方法:
- 鉴定CREBH作为一个受RIP监管的肝脏特异性转录因子.
- 在ER应激时通过1位和2位蛋白酶对CREBH裂变的分析.
- 研究CREBH在激活血清粉样蛋白P成分 (SAP) 和C反应蛋白 (CRP) 基因表达中的作用.
主要成果:
- 支持炎症的细胞因子增加了ER膜固的CREBH的表达.
- ER压力诱导CREBH裂变,释放一个激活APR基因 (SAP,CRP) 的核片段.
- 在体内研究表明,脂多糖和益炎性细胞因子激活UPR,并诱导CREBH在肝脏中的裂变.
结论:
- 已经确定了激活ER局部化转录因子CREBH的分子机制.
- ER压力通过激活CREBH和随后的APR基因表达引发了急性炎症反应.
- 这项研究揭示了ER压力与炎症过程的启动之间的前所未有的联系.
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