钠在血管平滑肌细胞中的共转运。

Blood vessels Pub Date : 1991-01-01 DOI:10.1159/000158853
M E O'Donnell, N E Owen
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引用次数: 9

摘要

血管平滑肌细胞具有多个钠共转运系统。其中三种共转运系统,Na/Ca交换,Na/H交换和Na- k - cl共转运,已经成为越来越多研究的主题,以确定这些转运蛋白在血管平滑肌细胞功能中的各自作用。已有证据表明,钠钙交换系统参与血管平滑肌细胞内钙离子的调节。Na/H交换系统似乎与Cl/HCO3交换系统协同作用,以调节细胞内ph。Na-K-Cl共转运系统是血管平滑肌细胞质膜上钾通量的主要贡献者,并受到许多血管活性物质的调节,这表明Na共转运系统也是血管平滑肌细胞功能的重要组成部分。与正常血压对照的血管平滑肌细胞相比,来自自发性高血压大鼠的血管平滑肌细胞培养的Na-K-Cl共转运活性降低。因此,血管平滑肌Na-K-Cl共转运活性的改变可能与血管张力的改变有关。然而,Na-K-Cl共转运在血管平滑肌细胞中的确切功能尚不清楚。最近对血管内皮细胞中Na- k - cl共转运的研究表明,这种共转运体对内皮细胞体积的调节很重要,并表明这种Na共转运系统可能对血管的正常功能至关重要。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Sodium cotransport in vascular smooth muscle cells.

Vascular smooth muscle cells possess a number of Na cotransport systems. Three of these cotransport systems, Na/Ca exchange, Na/H exchange and Na-K-Cl cotransport, have been the subject of an increasing number of investigations to determine the respective roles of these transporters in vascular smooth muscle cell function. Evidence has been obtained that the Na/Ca exchange system participates in regulation of intracellular Ca in vascular smooth muscle cells. The Na/H exchange system appears to function in concert with a Cl/HCO3 exchange system to regulate intracellular pH. The Na-K-Cl cotransport system is a major contributor to K flux across the plasma membrane of vascular smooth muscle cells and is regulated by a number of vasoactive agents, suggesting that this Na cotransport system is also an important component of vascular smooth muscle cell function. Cultured vascular smooth muscle cells derived from spontaneously hypertensive rats have been found to exhibit reduced Na-K-Cl cotransport activity compared to smooth muscle cells from normotensive controls. Thus, alteration of vascular smooth muscle Na-K-Cl cotransport activity may be related to changes in vascular tone. However, the precise function of Na-K-Cl cotransport in vascular smooth muscle cells remains to be clarified. Recent studies of Na-K-Cl cotransport in vascular endothelial cells provide evidence that the co-transporter is important for regulation of endothelial cell volume and suggest that this Na cotransport system may be vitally important for normal function of the vasculature.

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