Protein kinase G regulates potassium chloride cotransporter-3 expression in primary cultures of rat vascular smooth muscle cells

被引:46
作者
Di Fulvio, M
Lincoln, TM
Lauf, PK
Adragna, NC
机构
[1] Wright State Univ, Sch Med, Dept Pharmacol & Toxicol, Dayton, OH 45435 USA
[2] Wright State Univ, Sch Med, Dept Physiol & Biophys, Dayton, OH 45435 USA
[3] Univ Alabama Birmingham, Dept Pathol, Div Mol & Cellular Pathol, Birmingham, AL 35294 USA
关键词
D O I
10.1074/jbc.M100901200
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
K-C1 cotransport (KCC) is activated by nitric oxide donors and appears to be regulated by the cGMP signaling pathway. Expression of KCC mRNAs (KCC1-KCC4) in rat vascular smooth muscle cells (VSMCs) is unknown. We have reported the presence of KCC1 and KCC3 mRNAs in primary cultures of VSMCs by specific reverse transcription-polymerase chain reaction. KCC2 mRNA appeared at extremely low levels. KCC4 mRNA was undetectable. Semiquantitative reverse transcription-polymerase chain reaction revealed a 2:1 KCC1/ KCC3 mRNA ratio in VSMCs. Depletion of protein kinase G (PKG)-1 from VSMCs did not change KCC3 mRNA expression. Analogous results were obtained with PKG-1-catalytic domain- and vector only-transfected VSMCs lacking endogenous PEG, suggesting no involvement of PKG-1 in the maintenance of basal KCC3 mRNA expression. However, 8-bromo-cGMP, a PKG stimulator, acutely increased KCC3 mRNA expression in a concentration- and time-dependent fashion; this effect was blocked by the PKG inhibitor KT5823 but not by actinomycin D, These findings show that VSMCs express mainly two mRNA isoforms, KCC1 and KCC3, and suggest that PEG participates post-transcriptionally in the acute KCC3 mRNA regulation. The role of KCC3 on cell volume and electrolyte homeostasis in response to PKG modulators remains to be determined.
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页码:21046 / 21052
页数:7
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