首页> 外文期刊>American Journal of Physiology >A role for MAP kinase in differentiated smooth muscle contraction evoked by alpha-adrenoceptor stimulation.
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A role for MAP kinase in differentiated smooth muscle contraction evoked by alpha-adrenoceptor stimulation.

机译:MAP激酶在α-肾上腺素受体刺激引起的分化平滑肌收缩中的作用。

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The purpose of this study was to investigate the potential role of mitogen-activated protein (MAP) kinase in smooth muscle contraction by monitoring MAP kinase activation, caldesmon phosphorylation, and contractile force during agonist stimulation. Isometric tension in response to KCl and phenylephrine (PE) was measured from strips of ferret aorta. MAP kinase activation was monitored by Western blot using a phosphospecific p44/p42 MAP kinase antibody. Caldesmon phosphorylation was assessed using specific phosphocaldesmon antibodies. We report here that treatment of smooth muscle strips with PD-098059, a specific inhibitor of MAP kinase kinase, did not detectably modify the KCl-evoked contraction but significantly inhibited the contraction to PE in the absence of extracellular Ca2+. In this experimental condition, where the contraction occurs in the absence of increases in 20-kDa myosin light chain phosphorylation, PD-098059 also inhibited significantly MAP kinase and caldesmon phosphorylation. Collectively, these results demonstrate a direct cause-and-effect relationship between MAP kinase activation and Ca2+-independent smooth muscle contraction and support the concept of caldesmon phosphorylation as the missing link between both events.
机译:这项研究的目的是通过监测激动剂刺激过程中的MAP激酶激活,卡尔德斯蒙磷酸化和收缩力来研究丝裂原激活蛋白(MAP)激酶在平滑肌收缩中的潜在作用。从雪貂主动脉带中测量对KCl和去氧肾上腺素(PE)的等距张力。使用磷酸特异性p44 / p42 MAP激酶抗体,通过蛋白质印迹法监测MAP激酶的活化。 Caldesmon磷酸化使用特定的磷酸Caldesmon抗体进行评估。我们在这里报告说,用PD-098059(一种MAP激酶激酶的特异性抑制剂)治疗平滑肌条并没有可检测地修饰KCl引起的收缩,但是在没有细胞外Ca2 +的情况下显着抑制了PE的收缩。在该实验条件下,在不增加20 kDa肌球蛋白轻链磷酸化的情况下发生收缩的情况下,PD-098059也显着抑制了MAP激酶和caldesmon磷酸化。这些结果共同证明了MAP激酶激活与非Ca2 +依赖性平滑肌收缩之间存在直接的因果关系,并支持Caldesmon磷酸化作为这两个事件之间缺失的联系的概念。

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