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Effects of palmatine on isometric force and intracellular calcium levels of arterial smooth muscle.

机译:巴马汀对动脉平滑肌的等轴测力和细胞内钙水平的影响。

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The effects of palmatine on isometric force and intracellular free calcium levels ([Ca2+]i) were determined in isolated rat arterial strips. Palmatine dose-dependently relaxed the contractile responses stimulated by phenylephrine (PE) in aortic strips. In contrast, it only partially relaxed aortic strips contracted by 51 mM KCl. Pretreatment with palmatine shifted the dose-response curves of PE both rightwards and downwards in a dose-dependent manner. When Ca2+-free solution and re-addition of Ca2+ were applied to assess PE-induced phasic and tonic contractions, palmatine was found to be effective in inhibiting both contractions. The effects of palmatine on intracellular calcium levels were measured with the bioluminescent calcium indicator aequorin in rat tail artery strips. Palmatine caused a concomitant, dose-dependent decrease in PE-activated isometric force and [Ca2+]i, resulting in small changes in the [Ca2+]i-force relationship. These results suggest that vasodilatory effect of palmatine was mediated by reducing [Ca2+]i as well as affecting [Ca2+]i sensitivity of the contractile apparatus. Palmatine-induced [Ca2+]i decreases appeared to involve decreases in both Ca2+ release from intracellular stores and Ca2+ influx through calcium channels.
机译:在分离的大鼠动脉条中测定了棕榈碱对等轴测力和细胞内游离钙水平([Ca2 +] i)的影响。棕榈碱剂量依赖性地放松了去氧肾上腺素(PE)在主动脉条中刺激的收缩反应。相反,它仅使51 mM KCl收缩的主动脉条部分松弛。用棕榈碱预处理可以使PE的剂量反应曲线向右和向下移动,并呈剂量依赖性。当使用不含Ca2 +的溶液并重新添加Ca2 +来评估PE诱导的相变和张力性收缩时,发现棕榈碱可以有效抑制两种收缩。用生物发光钙指示剂水母发光蛋白在大鼠尾动脉条中测量棕榈碱对细胞内钙水平的影响。 Palmatine引起了PE激活的等轴测力和[Ca2 +] i的剂量依赖性降低,从而导致[Ca2 +] i-力关系的微小变化。这些结果表明,棕榈碱的血管舒张作用通过降低[Ca 2+] i以及影响收缩装置的[Ca 2+] i敏感性来介导。棕榈碱诱导的[Ca2 +] i降低似乎涉及细胞内存储中Ca2 +释放的减少以及通过钙通道的Ca2 +流入的减少。

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