Reduction of dopamine beta-hydroxylase gene expression by calcium in bovine chromaffin cells.
We determined the effect of Ca++ influx on dopamine beta-hydroxylase ( DBH) gene expression in primary cultured bovine chromaffin cells. The Ca++ ionophore A23187 (100nM) specifically reduced DBH mRNA to 15 +/- 10% of the untreated control while tyrosine hydroxylase was induced (142 +/- 15%) and phenylethanolamine N-methyltransferase was unchanged (107 +/- 11%). This effect on DBH was also observed with ionomycin, reversed by EGTA and unaffected by cycloheximide. Depolarization by potassium also resulted in DBH reduction which was reversed by the voltage dependent Ca++ channel blockers nifedipine and verapamil. DBH mRNA level reduced by A23187 could be re-induced by forskolin and DBH induced by forskolin could be reduced by the ionophore, suggesting that the cAMP and Ca++ pathways might act independently in regulating DBH gene expression.[1]References
- Reduction of dopamine beta-hydroxylase gene expression by calcium in bovine chromaffin cells. Hwang, O., Lee, J.D. Biochem. Biophys. Res. Commun. (1995) [Pubmed]
Annotations and hyperlinks in this abstract are from individual authors of WikiGenes or automatically generated by the WikiGenes Data Mining Engine. The abstract is from MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.About WikiGenesOpen Access LicencePrivacy PolicyTerms of Useapsburg