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• W2094764770 endingPage "1849" @default.
• W2094764770 startingPage "1841" @default.
• W2094764770 abstract "The L-type calcium channel is a heteromultimeric protein complex, which is expressed in the cardiac sarcolemma. Although post-translational regulation of its subunits by protein kinase A (PKA) has been widely reported, little is known about molecular processes that regulate expression of calcium channel subunits (alpha(1C), alpha(2)- delta, and beta(2A)subunits). Previous studies from our group demonstrate that the steady-state mRNA level of the alpha(1C)unit is increased by treatment of myocytes with beta -adrenergic agonists. The current study is designed to determine whether the mRNA levels for all subunits of the L-type calcium channel are coordinately controlled by a beta -adrenergic agonist, and whether this occurs predominantly through control of rate of transcription. Nuclear run-on assays were used to determine the transcription initiation rate of these genes in cultured neonatal rat cardiac myocytes. In isoproterenol (10(-7)m)-treated myocytes, transcription of genes encoding the alpha(1C), alpha(2)- delta, and beta(2A)subunits was enhanced. The increases in transcription initiation rate for alpha(1C), alpha(2)- delta, and beta(2A)subunits genes were 404%, 367%, and 240% of control, respectively. Pretreatment with the beta -adrenergic antagonist propranolol (10(-5)m) or PKA inhibitor H-89 (10(-6)m) blocked the effects of isoproterenol, while either drug alone did not affect the gene transcription rate significantly. Steady state mRNA levels of the subunits increased following isoproterenol treatment. These results suggest that beta -adrenergic stimulation and the PKA signaling pathway play an important role in transcriptional regulation of the L-type calcium channel in myocyte. The expression of all the subunits of this ion channel is under coordinate transcriptional control." @default.
• W2094764770 created "2016-06-24" @default.
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• W2094764770 date "2000-10-01" @default.
• W2094764770 modified "2023-09-26" @default.
• W2094764770 title "Transcriptional Regulation of L-type Calcium Channel Expression in Cardiac Myocytes" @default.
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• W2094764770 doi "https://doi.org/10.1006/jmcc.2000.1217" @default.
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