Circulation:XBP1s通过激活mTOR刺激心肌细胞适应性生长

2019-08-19 MedSci MedSci原创

蛋白质的非折叠反应在生理和病理生理中均具有多方面的作用。但其与细胞生长的关系仍不明确。现研究人员通过功能获得性和功能丧失性方法对剪切型X-box结合蛋白1(XBP1s)进行基因编辑,来研究蛋白非折叠反应在心脏心肌细胞生长调控中的作用。研究人员发现XBP1s在心力衰竭的人和啮齿类动物的心脏组织中的表达水平都下降。而且,XBP1s缺乏会加剧压力超负荷下的失代偿和心衰进展。另一方面,心脏限制性过表达XB

蛋白质的非折叠反应在生理和病理生理中均具有多方面的作用。但其与细胞生长的关系仍不明确。

现研究人员通过功能获得性和功能丧失性方法对剪切型X-box结合蛋白1(XBP1s)进行基因编辑,来研究蛋白非折叠反应在心脏心肌细胞生长调控中的作用。

研究人员发现XBP1s在心力衰竭的人和啮齿类动物的心脏组织中的表达水平都下降。而且,XBP1s缺乏会加剧压力超负荷下的失代偿和心衰进展。另一方面,心脏限制性过表达XBP1s可预防心功能障碍的发生。

在机制上,研究人员发现XBP1s通过激活雷帕霉素信号传导的机制靶点来刺激心脏适应性的生长,该机制靶点是通过XBP1s的一个新的转录靶点FKBP11 (FK506结合蛋白11)介导的。此外,沉默FKBP11可显著降低XBP1s诱导的雷帕霉素活化的机制靶点和细胞适应性生长。

本研究结果表明,雷帕霉素轴的XBP1s-FKBP11机制靶点在蛋白未折叠反应与心肌细胞生长调控的耦合中发挥重要作用。

原始出处:

Xiaoding Wang,et al. Spliced X-box Binding Protein 1 Stimulates Adaptive Growth Through Activation of mTOR. Circulation. 2019;140:566–579. https://doi.org/10.1161/CIRCULATIONAHA.118.038924

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    2020-02-25 yeye5224612
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    2019-11-10 119337457
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