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Protein phosphorylation in bovine adrenal medullary chromaffin cells: histamine-stimulated phosphorylation of tyrosine hydroxylase



Protein phosphorylation in bovine adrenal medullary chromaffin cells: histamine-stimulated phosphorylation of tyrosine hydroxylase



Journal of Neurochemistry 59(1): 164-174



Histamine can cause the release of catecholamines from bovine adrenal medullary chromaffin cells by a mechanism distinct from that of the depolarizing agents nicotine or high K+ buffer. It was the aim of this study to determine the protein phosphorylation responses to histamine in these cells and to compare them with those induced by depolarization. A number of proteins showed increases in phosphorylation in response to histamine especially when analyzed on two-dimensional polyacrylamide gel electrophoresis or by phosphopeptide mapping; one protein of 20,000 daltons was markedly dephosphorylated. Emphasis was given to the effects of histamine on tyrosine hydroxylase (TOH) phosphorylation, because this protein showed the most prominent changes on one-dimensional gels. Histamine acted via H1 receptors to increase TOH phosphorylation; the response was blocked by the H1 antagonist mepyramine and could be mimicked by the H1 agonist thiazolylethylamine, but not by the H2 agonist dimaprit. The H3 agonist (R) alpha-methylhistamine increased TOH phosphorylation at high concentrations, but the response was blocked entirely by mepyramine. Histamine rapidly increased the phosphorylation of TOH, with a maximum reached within 5 s and maintained for at least 30 min. This was in marked contrast to nicotine-stimulated protein phosphorylation of TOH, which was rapidly desensitized. The initial phosphorylation response to histamine was independent of extracellular Ca2+ for at least 3 min, but the sustained response required extracellular Ca2+. This was in contrast to the situation with both nicotine and high K+ buffer, which under the conditions used here caused a response which was dependent on extracellular Ca2+ at all times investigated. In the presence of histamine, the phosphopeptide profiles for TOH were essentially the same with or without Ca2+, suggesting that the same protein kinases were involved, but at longer times there was evidence of new phosphorylation sites. The mechanism or mechanisms whereby histamine modulates TOH phosphorylation are discussed with emphasis on the differences from depolarizing agents.

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Accession: 041110958

Download citation: RISBibTeXText

PMID: 1351923

DOI: 10.1111/j.1471-4159.1992.tb08887.x


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