首页> 外文期刊>Endothelium: Journal of endothelial cell research >Expression of VACM-1 protein in cultured rat adrenal endothelial cells is linked to the cell cycle.
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Expression of VACM-1 protein in cultured rat adrenal endothelial cells is linked to the cell cycle.

机译:VACM-1蛋白在培养的大鼠肾上腺内皮细胞中的表达与细胞周期有关。

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The vasopressin-activated calcium-mobilizing (VACM-1) protein is a unique arginine vasopressin (AVP) receptor which shares sequence homology with the cullins, genes involved in the regulation of cell cycle transitions. Unlike either cullins or AVP receptors, however, VACM-1 is expressed exclusively in the vascular endothelial cells and in the renal collecting tubule cells. In order to test the hypothesis that the expression of VACM-1 might be correlated with the cell cycle, and to establish an endothelial cell model for the VACM-1 receptor, we examined VACM-1 expression in rat adrenal medulla endothelial cells (RAMEC). Northern and Western blot analyses of mRNA and protein from RAMEC identified presence of 6.4 kb mRNA and a Mr 81 kDa protein, respectively. Immunostaining of RAMEC with anti-VACM-1 antibodies and Western blot analyses indicated that in RAMEC, VACM-1 protein expression is dependent on the cell cycle. VACM-1 protein virtually disappears during the S phase and localizes to the cytosol during cell division and to the cell membrane at the completion of cytokinesis. Furthermore, pretreatment of RAMEC with anti-VACM-1 specific antibodies increased basal levels of Ca2+and attenuated the AVP-dependent increase in cytosolic Ca2+. In summary, these results indicate that VACM-1 protein expression in RAMEC membrane is linked to the cell cycle, and consequently, VACM-1 may be involved in the regulation of cell division.
机译:血管加压素活化钙动员(VACM-1)蛋白是独特的精氨酸加压素(AVP)受体,与cullins具有序列同源性,cullins是参与细胞周期转换调控的基因。与cullins或AVP受体不同,VACM-1仅在血管内皮细胞和肾收集小管细胞中表达。为了检验VACM-1的表达可能与细胞周期相关的假设,并建立VACM-1受体的内皮细胞模型,我们检查了VACM-1在大鼠肾上腺髓质内皮细胞(RAMEC)中的表达。来自RAMEC的mRNA和蛋白质的Northern和Western印迹分析分别确定了6.4 kb mRNA和Mr 81 kDa蛋白的存在。用抗VACM-1抗体对RAMEC进行免疫染色和蛋白质印迹分析表明,在RAMEC中,VACM-1蛋白的表达取决于细胞周期。 VACM-1蛋白实际上在S期消失,并在细胞分裂过程中定位于胞质溶胶,并在胞质分裂完成时定位于细胞膜。此外,用抗VACM-1特异性抗体对RAMEC进行预处理可增加基础水平的Ca2 +,并减弱AVP依赖性的胞质Ca2 +升高。总之,这些结果表明RAMEC膜中的VACM-1蛋白表达与细胞周期有关,因此,VACM-1可能参与细胞分裂的调控。

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