Distinct Roles of Smooth Muscle and Non-muscle Myosin Light Chain-Mediated Smooth Muscle Contraction.

Distinct Roles of Smooth Muscle and Non-muscle Myosin Light Chain-Mediated Smooth Muscle Contraction.
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平滑肌和非肌肉肌球蛋白轻链介导的平滑肌收缩的不同作用

DOI:
10.3389/fphys.2020.593966
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发表时间:
2020
影响因子:
4
通讯作者:
Zhu MS
Zhu MS
中科院分区:
医学2区
文献类型:
--
作者:
Sun J;Qiao YN;Tao T;Zhao W;Wei LS;Li YQ;Wang W;Wang Y;Zhou YW;Zheng YY;Chen X;Pan HC;Zhang XN;Zhu MS

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平滑肌(SM)和非肌肉(NM)肌球蛋白II在膀胱、子宫等中空器官均有表达,但它们各自在收缩中的作用和相应的生理功能尚不清楚。在这份报告中,我们通过分析编码SM肌球蛋白调节轻链(SM RLC)的Myl9基因缺陷的小鼠来评估它们的作用。我们发现,尽管没有初始阶段,但全球Myl9缺乏的膀胱收缩了一个明显的持续阶段。这种持续收缩是由肌球蛋白轻链激酶(MLCK)对NM肌球蛋白RLC(NM RLC)的磷酸化所介导的。NM肌球蛋白II在子宫和幼年小鼠膀胱中大量表达,因此NM肌球蛋白抑制对NM肌球蛋白II的作用敏感。我们的发现揭示了SM RLC和NM RLC在SM收缩中的不同作用。
Both smooth muscle (SM) and non-muscle (NM) myosin II are expressed in hollow organs such as the bladder and uterus, but their respective roles in contraction and corresponding physiological functions remain to be determined. In this report, we assessed their roles by analyzing mice deficient of Myl9, a gene encoding the SM myosin regulatory light chain (SM RLC). We find that global Myl9-deficient bladders contracted with an apparent sustained phase, despite no initial phase. This sustained contraction was mediated by NM myosin RLC (NM RLC) phosphorylation by myosin light chain kinase (MLCK). NM myosin II was expressed abundantly in the uterus and young mice bladders, of which the force was accordingly sensitive to NM myosin inhibition. Our findings reveal distinct roles of SM RLC and NM RLC in SM contraction.
DOI: 10.1074/jbc.272.19.12257
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