修改PKG1的TSC2调节mTORC1活动以应对不良的心脏压力
Mark J Ranek1, Kristen M Kokkonen-Simon1, Anna Chen1
1Division of Cardiology, Department of Medicine, The Johns Hopkins Medical Institutions, Baltimore, MD, USA.
Nature
|February 1, 2019
概括
在特定的血清位点化素 (TSC2) 双向控制mTORC1活动,这对心脏保护至关重要. 这种TSC2酸化对于蛋白激酶G1 (PKG1) 介导的心脏保护对压力过载至关重要.
科学领域:
- 心血管生物学
- 分子细胞生物学
- 生物化学
背景情况:
- 机械向的拉巴胺素复合物-1 (mTORC1) 调节生长,新陈代谢和自,过度活化与心脏病有关.
- 素 (TSC2) 是mTORC1的关键调节剂,通过各种激酶的酸化来调节,使体内分析复杂化.
- 蛋白激酶G1 (PKG1) 是氧化信号传递的作用因子,可预防心脏病.
研究的目的:
- 研究TSC2酸化中的特定血清残留在控制mTORC1活动中的作用.
- 确定TSC2化对PKG1中介心脏保护的必要性和充分性.
- 探索TSC2血清残留作为调节压力刺激mTORC1活动的工具的潜力.
主要方法:
- 在TSC2中使用具有酸化抑制 (TSC2 ((S1365A)) 和酸化模仿 (TSC2 ((S1365E)) 突变的同卵性敲进小鼠.
- 在这些小鼠模型中评估持续压力过载下的心脏功能和存活率.
- 研究了PKG1刺激和TSC2化对mTORC1活动,细胞生长和心肌细胞和纤维细胞的自的影响.
主要成果:
- 在S1365/S1366 (老鼠) 或S1364/S1365 (人类) 中的TSC2酸化或突变可以在不改变基底活性的情况下双向控制压力刺激的mTORC1活性.
- 通过PKG1化这些TSC2位点,抑制心肌细胞缩并刺激自.
- 由于无法控制的mTORC1过活性,TSC2 (S1365A) 的小鼠表现出恶化的心脏病和压力过重的死亡率,而TSC2 (S1365E) 的小鼠表现出改善的结果.
结论:
- 对于PKG1介导的对压力过载的心脏保护,对特定的血清残留物进行TSC2酸化是必要的,也是足够的.
- 这些已识别的血清残留物为双向调节压力诱导的mTORC1活动提供了遗传策略.
- 向TSC2酸化为治疗与mTORC1失调相关的心脏病提供了潜在的治疗途径.
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