Integrin-linked kinase is responsible for Ca2+-independent myosin diphosphorylation and contraction of vascular smooth muscle.

Integrin-linked kinase is responsible for Ca2+-independent myosin diphosphorylation and contraction of vascular smooth muscle.
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整合素连接激酶负责 Ca2+ 独立的肌球蛋白二磷酸化和血管平滑肌的收缩。

DOI:
10.1042/bj20051173
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发表时间:
2005
期刊:
The Biochemical journal
影响因子:
--
通讯作者:
M. Walsh
M. Walsh
中科院分区:
--
文献类型:
--
作者:
David P. Wilson;C. Sutherland;M. Borman;J. Deng;J. MacDonald;M. Walsh

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Ca2+/钙调蛋白依赖性 MLCK(肌球蛋白轻链激酶)对 LC20(肌球蛋白 II 的 20 kDa 轻链)的 Ser-19 进行磷酸化,从而激活平滑肌收缩。在平滑肌组织和培养细胞中观察到 LC20 在 Ser-19 和 Thr-18 位点的二磷酸化,以响应各种收缩刺激,以及在与收缩过度相关的病理情况下。 MLCP(肌球蛋白轻链磷酸酶)抑制可导致 LC20 二磷酸化和 Ca2+ 独立收缩,这并非 MLCK 所致。两种激酶已成为 Ca2+ 独立的 LC20 二磷酸化的候选者:ILK(整合素连接激酶)和 ZIPK(拉链相互作用蛋白激酶)。 Triton X-100 皮肤的大鼠尾部动脉平滑肌用于研究 ILK 和 ZIPK 在不依赖 Ca2+、微囊藻毒素(磷酸酶抑制剂)诱导的 LC20 二磷酸化和收缩中的相对重要性。蛋白质印迹和凝胶内激酶测定表明,两种激酶均保留在该制剂中。钙调蛋白耗尽的组织响应微囊藻毒素的 Ca2+ 独立收缩对 MLCK 抑制剂 [AV25(一种源自 MLCK 自身抑制结构域的 25 个氨基酸肽)、ML-7、ML-9 和渥曼青霉素]、蛋白激酶 C 抑制剂 (GF109203X) 和 Rho 相关激酶抑制剂(Y-27632 和 H-1152)具有抗性,但被阻断由非选择性激酶抑制剂十字孢菌素产生。 ZIPK 被 AV25 抑制(IC50 0.63+/-0.05 µM),而 ILK 对 AV25 不敏感(浓度高达 100 µM)。 AV25 对不依赖 Ca2+ 的、微囊藻毒素诱导的 LC20 单磷酸化或二磷酸化没有影响,对力的影响不大。我们得出的结论是,在不存在 Ca2+ 的情况下直接抑制 MLCP 会暴露 ILK 活性,从而磷酸化 LC20 Ser-19 和 Thr-18 以诱导收缩。 ILK 可能是负责血管平滑肌细胞和组织中肌球蛋白二磷酸化的激酶。
Smooth muscle contraction is activated by phosphorylation at Ser-19 of LC20 (the 20 kDa light chains of myosin II) by Ca2+/calmodulin-dependent MLCK (myosin light-chain kinase). Diphosphorylation of LC20 at Ser-19 and Thr-18 is observed in smooth muscle tissues and cultured cells in response to various contractile stimuli, and in pathological circumstances associated with hypercontractility. MLCP (myosin light-chain phosphatase) inhibition can lead to LC20 diphosphorylation and Ca2+-independent contraction, which is not attributable to MLCK. Two kinases have emerged as candidates for Ca2+-independent LC20 diphosphorylation: ILK (integrin-linked kinase) and ZIPK (zipper-interacting protein kinase). Triton X-100-skinned rat caudal arterial smooth muscle was used to investigate the relative importance of ILK and ZIPK in Ca2+-independent, microcystin (phosphatase inhibitor)-induced LC20 diphosphorylation and contraction. Western blotting and in-gel kinase assays revealed that both kinases were retained in this preparation. Ca2+-independent contraction of calmodulin-depleted tissue in response to microcystin was resistant to MLCK inhibitors [AV25 (a 25-amino-acid peptide derived from the autoinhibitory domain of MLCK), ML-7, ML-9 and wortmannin], protein kinase C inhibitor (GF109203X) and Rho-associated kinase inhibitors (Y-27632 and H-1152), but blocked by the non-selective kinase inhibitor staurosporine. ZIPK was inhibited by AV25 (IC50 0.63+/-0.05 microM), whereas ILK was insensitive to AV25 (at concentrations as high as 100 microM). AV25 had no effect on Ca2+-independent, microcystin-induced LC20 mono- or di-phosphorylation, with a modest effect on force. We conclude that direct inhibition of MLCP in the absence of Ca2+ unmasks ILK activity, which phosphorylates LC20 at Ser-19 and Thr-18 to induce contraction. ILK is probably the kinase responsible for myosin diphosphorylation in vascular smooth muscle cells and tissues.
血液诱发的血管痉挛中肌球蛋白轻链磷酸化的时间过程。
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