化RPN6通过PKA调解蛋白质酶激活,缓解蛋白质病变
Liuqing Yang1, Nirmal Parajuli1, Penglong Wu1,2
1Division of Basic Biomedical Sciences, University of South Dakota Sanford School of Medicine, Vermillion, SD (L.Y., N.P., P.W., X.W.).
Circulation research
|August 29, 2023
概括
蛋白激酶A (PKA) 在体内通过ps14-Rpn6激活26S蛋白酶体. 降低ps14-rpn6是心脏蛋白质病变的关键因素,提供了一个新的治疗点.
科学领域:
- 细胞生物学 细胞生物学
- 生物化学 生物化学
- 心血管研究的心血管研究.
背景情况:
- 了解蛋白酶调节对于开发新疗法至关重要.
- 以前的研究表明,蛋白激酶A (PKA) 在细胞培养中通过PS14-Rpn6激活26S蛋白质酶.
- 这种PKA-Rpn6相互作用的体内意义尚未确定.
研究的目的:
- 调查pS14-Rpn6在调节26S蛋白酶体活性中的体内作用.
- 为了确定PKA介导的蛋白酶激活的生理意义.
- 探索ps14-rpn6与心脏蛋白毒性之间的联系.
主要方法:
- 产生了Rpn6 (S14A和S14D) 的Ser14突变的小鼠,以阻止或模仿酸化.
- 利用了对cAMP/PKA通路的药理学操纵.
- 通过GFPdgn记者小鼠和蛋白质酶体活动测定,评估了全方位素-蛋白质酶体系统功能.
- 在心脏病小鼠模型中测试了S14A和S14D突变对蛋白质毒性的影响.
主要成果:
- PKA激活增加了野生类型的蛋白质酶活性,但不是S14A细胞和组织.
- S14D突变增强了心脏和心肌细胞中的基底蛋白酶活性.
- 在心脏蛋白质病症模型中,S14D小鼠显示蛋白质毒性降低,蛋白质聚合物降低,心脏功能改善.
- 在心脏蛋白毒性模型中观察到降低的ps14-rpn6水平.
结论:
- pS14-Rpn6在体内调解26S蛋白酶体的PKA依赖激活.
- 降低ps14-rpn6是心脏蛋白质病变的关键病原性因素.
- 向ps14-rpn6代表了减少心脏蛋白毒性的新疗法策略.
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