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- W1564760784 abstract "The expression level of angiotensin II (ANG II) type 1 receptors (AT1) determines the magnitude of ANG II signaling in vascular smooth muscle cells (VSMC). AT1 mRNA expression in cultured bovine VSMC increased twofold after 8 h of protein kinase C (PKC) activation with phorbol 12-myristate 13-acetate (PMA), whereas stimulation with forskolin did not alter the AT1 mRNA level. The expression of AT1 promoter/exon 1 [-513/+92 base pairs (bp)] luciferase constructs transfected into VSMC increased 2.4-fold with PMA stimulation. In-gel kinase assays demonstrated rapid phosphorylation of mitogen-activating protein kinases (MAPK) ERK1 and ERK2 by PMA. Electrophoretic gel mobility shift assays showed sequence-specific binding of nuclear proteins from PMA-activated VSMC, identified as activator protein 1 (AP-1) complex in competition assays, to a radiolabeled AT1-promoter fragment (-368/-399 bp). Recombinant AP-1 binds in a sequence-specific manner to the -386/-399-bp region. Site-specific mutagenesis destroying the AP-1 site, the adjacent polyoma enhancer activator 3 element, or both sites simultaneously indicated that both sites together are necessary and sufficient to control basal and PMA-induced activation of the human AT1 promoter in transfected VSMC. The capability of the phorbol ester PMA to activate the human AT1 promoter in VSMC via an AP-1 element suggests a prominent role for PKC/MAPK and Ets proteins in AT1 regulation." @default.
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- W1564760784 date "1997-08-01" @default.
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- W1564760784 title "Protein kinase C-dependent regulation of the human AT1 promoter in vascular smooth muscle cells" @default.
- W1564760784 doi "https://doi.org/10.1152/ajpheart.1997.273.2.h655" @default.
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