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- W95576822 abstract "Angiotensin II (ANG II) induces vascular smooth muscle contraction and functions as a growth factor stimulating vascular smooth muscle cell (VSMC) hypertrophy. We wondered whether ANG II might induce expression of alpha 1-adrenergic receptors (ARs) in cultured VSMCs, which would then potentially accentuate the effects of catecholamines in the cells. Rat VSMCs were preincubated with phenoxybenzamine to inactivate alpha 1-ARs; the cells were then treated with ANG II for 24 h. ANG II-treated cells expressed an increased number of alpha 1-ARs compared with controls, suggesting that ANG II increased the rate of alpha 1-AR synthesis. ANG II markedly induced accumulation of alpha 1A/D- and alpha 1B-AR mRNAs in a concentration- and time-dependent manner. This effect of ANG II was blocked by the specific ANG II-receptor agonist [Sar1-Ile8]ANG II. ANG II-induced accumulation of alpha 1A/D-AR mRNAs was completely abolished by transcriptional inhibitor actinomycin D. ANG II markedly increased the transcriptional rate of the alpha 1A/D-AR gene without changing stability of alpha 1A/D-AR mRNAs. Protein kinase C (PKC) activator 4 beta-phorbol 12-myristate 13-acetate also induced accumulation of alpha 1A/D-AR mRNAs, and PKC inhibitor H-7 completely blocked ANG II-induced accumulation of the alpha 1A/D-AR mRNAs. Neither the biologically inactive ANG II analogue des-Phe8-ANG II nor the calcium ionophores A-23187 and BAY K-8466 induced alpha 1A/D-AR mRNAs. Finally, ANG II preincubation increased alpha 1-AR agonist phenylephrine-stimulated expression of the c-fos gene.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W95576822 date "1995-03-01" @default.
- W95576822 modified "2023-10-12" @default.
- W95576822 title "Angiotensin II induces transcription and expression of alpha 1-adrenergic receptors in vascular smooth muscle cells" @default.
- W95576822 doi "https://doi.org/10.1152/ajpheart.1995.268.3.h1006" @default.
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