Evidence for the presence of smooth muscle α-actin within pericytes of the renal medulla.

Evidence for the presence of smooth muscle α-actin within pericytes of the renal medulla.
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肾髓质周细胞内存在平滑肌 α-肌动蛋白的证据。

DOI:
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发表时间:
1997
期刊:
American Journal of Physiology. Regulatory Integrative and Comparative Physiology
影响因子:
--
通讯作者:
A. Cowley
A. Cowley
中科院分区:
--
文献类型:
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作者:
F. Park;D. Mattson;L. A. Roberts;A. Cowley

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本研究旨在确定肾髓周细胞内是否存在平滑肌α-肌动蛋白mRNA和平滑肌α-肌动蛋白收缩因子。从显微解剖的外髓降血管直血管中提取总RNA,利用逆转录聚合酶链反应(RT-PCR)检测平滑肌α-肌动蛋白mRNA的表达。平滑肌α-肌动蛋白的表达是特定于直血管降支的,而不是小管污染的结果,因为抗利尿激素V2受体(一种特定的小管标志物)的RT-PCR扩增没有发生。为了确定将mRNA转化为蛋白质的确切细胞类型,我们使用单克隆平滑肌α-肌动蛋白抗体对肾外髓质和内髓质进行免疫组化,其特异性通过免疫印迹分析确定。外、内髓组织切片在直降血管周围的周细胞内选择性地发现平滑肌α-肌动蛋白。本研究表明,仅外髓和内髓内环绕直降血管的周细胞就含有平滑肌α-肌动蛋白mRNA和蛋白,因此是收缩元件的所在地,可以在控制肾髓血流量及其在肾髓内的分布中发挥血管调节作用。
This study was designed to determine whether smooth muscle α-actin mRNA and smooth muscle α-actin contractile protein elements were present within the renal medullary pericytes. Extraction of total RNA from microdissected outer medullary descending vasa recta allowed for the detection of smooth muscle α-actin mRNA expression using reverse transcription-polymerase chain reaction (RT-PCR). Expression of smooth muscle α-actin was specific to the descending vasa recta and not a result of tubular contamination because RT-PCR amplification of the vasopressin V2 receptor, which is a specific tubular marker, did not occur. To determine the exact cell type(s) that translate the mRNA into protein, we performed immunohistochemistry on the renal outer and inner medulla using a monoclonal smooth muscle α-actin antibody, whose specificity was determined by immunoblot analysis. Smooth muscle α-actin protein was found selectively within the pericytes surrounding the descending vasa recta from the outer and inner medullary tissue sections. This study demonstrates that the pericytes alone that surround the descending vasa recta within the outer and inner medulla contain smooth muscle α-actin mRNA and protein and are therefore the site of the contractile elements that could play a vasomodulatory role in the control of renal medullary blood flow and its distribution within the renal medulla.
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