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首页> 外文期刊>Journal of Cellular Physiology >The suppression of myosin light chain (MLC) phosphorylation during the response to lipopolysaccharide (LPS): beneficial or detrimental to endothelial barrier?
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The suppression of myosin light chain (MLC) phosphorylation during the response to lipopolysaccharide (LPS): beneficial or detrimental to endothelial barrier?

机译:抑制肌球蛋白轻链(多层陶瓷)磷酸化反应脂多糖(LPS):有益的或不利于内皮屏障?

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Sepsis-induced vascular leakage is a major underlying cause of the respiratory dysfunction seen in severe sepsis. Here, we studied the role of MLC phosphorylation in LPS-induced endothelial hyperpermeability and assessed how the changes in phospho-MLC distribution affect LPS-induced barrier dysfunction. We demonstrated that the changes in human lung microvascular endothelial permeability are preceded by the increase in intracellular calcium level, and increase in MYPT and MLC phosphorylation. Using the siRNA approach, we showed that both LPS-induced barrier dysfunction and MLC phosphorylation are attenuated by the depletion of the smooth muscle isoform of MLC kinase (MLCK) and Rho kinase 2 (ROCK2). Surprisingly, pharmacological inhibition of both ROCK1 and 2 with Y-27632 exacerbated LPS-induced drop in transendothelial resistance, although significantly decreasing MLC phosphorylation level. We next studied the involvement of protein kinase A (PKA)-dependent pathways in LPS-induced barrier dysfunction. We showed that LPS decreased the level of PKA-dependent phosphorylation in endothelial cells; and the pretreatment with forskolin or PKA activator bnz-cAMP counteracted this effect. Forskolin and bnz-cAMP also attenuated LPS-induced increase in MLC phosphorylation level. As we have shown earlier (Bogatcheva et al., 2009), forskolin and bnz-cAMP provide protection from LPS-induced barrier dysfunction. We compared the effects of bnz-cAMP and Y-27632 on phospho-MLC distribution and observed that while bnz-cAMP increased the association of the phospho-MLC signal with the cortical structures, Y-27632 decreased this association. These data indicate that an overall decrease in MLC phosphorylation could be either beneficial or detrimental to endothelial barrier, depending on the intracellular locale of major phospho-MLC changes.
机译:Sepsis-induced血管渗漏是一个主要的呼吸功能障碍的根本原因在严重脓毒症。LPS-induced内皮的多层陶瓷磷酸化研究和评估如何变化phospho-MLC分布影响LPS-induced屏障功能障碍。人类肺微血管内皮细胞的变化渗透率是之前的增加细胞内钙水平,增加MYPT和多层陶瓷磷酸化。方法中,我们表明,LPS-induced障碍功能障碍和多层陶瓷磷酸化减毒的损耗平滑肌同种型的多层陶瓷激酶(MLCK)和ρ激酶2(ROCK2)。ROCK1和2,y - 27632了LPS-induced transendothelial阻力下降,虽然显著降低多层陶瓷磷酸化水平。蛋白激酶A (PKA)端依赖的参与通路LPS-induced屏障功能障碍。表明,有限合伙人的水平下降PKA-dependent磷酸化在内皮细胞;活化剂bnz-cAMP抵消这种效应。Forskolin和bnz-cAMP也减弱多层陶瓷LPS-induced增加磷酸化的水平。, 2009), forskolin bnz-cAMP提供保护LPS-induced屏障功能障碍。我们比较bnz-cAMP和y - 27632的影响在phospho-MLC分发和发现虽然bnz-cAMP增加的协会phospho-MLC信号与皮质结构,y - 27632减少了这种联系。表明,多层陶瓷的整体下降磷酸化可以是有益的或不利于内皮屏障,这取决于主要phospho-MLC的胞内区域的变化。

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