RAP2介导Hippo通路的机械反应
Zhipeng Meng1, Yunjiang Qiu2,3, Kimberly C Lin1
1Department of Pharmacology and Moores Cancer Center, University of California San Diego, La Jolla, CA, USA.
Nature
|August 24, 2018
概括
与Ras相关的GTPase RAP2作为一个分子开关,通过Hippo途径效应器YAP和TAZ传递细胞外矩阵刚性信号来控制细胞生长和基因转录.
科学领域:
- 细胞生物学
- 机械生物学
- 分子信号
背景情况:
- 哺乳动物细胞对来自细胞外基质 (ECM) 的机械线索做出反应.
- 涉及YAP (YAP1) 和TAZ (WWTR1) 的Hippo通路调解细胞对ECM刚性的反应.
- 了解细胞如何感知和响应机械环境对于各种生物过程至关重要.
研究的目的:
- 确定将ECM刚性信息传递给YAP和TAZ的细胞内信号传感器.
- 阐明ECM硬度影响YAP/TAZ活动的分子机制.
- 确定了机械敏感细胞活动和基因表达中的途径的作用.
主要方法:
- 在哺乳动物细胞中RAP2的遗传删除.
- 生物化学测定用于研究蛋白质与蛋白质相互作用和酶活性.
- 对基因表达变化的分析,以应对不同的ECM刚度.
- 研究脂酶Cγ1 (PLCγ1),PDZGEF蛋白和下游激酶的作用.
主要成果:
- RAP2被确定为由低ECM刚度激活的关键信号传感器.
- 删除RAP2会通过硬性破坏YAP/TAZ调节,并促进异常细胞生长.
- 通过PLCγ1和PDZGEF蛋白质调节RAP2活动.
- 在低度的活性RAP2通过激活LATS1/ 2激酶来抑制YAP/ TAZ.
- YAP和TAZ对于ECM度响应转录组至关重要.
结论:
- RAP2作为机械传导中的分子开关,将ECM刚性与YAP/TAZ抑制联系起来.
- 从ECM刚性到涉及RAP2,YAP和TAZ的核的新途径被定义.
- 这种途径调节机械敏感转录和细胞活动,影响细胞生长.
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