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• W1963669015 endingPage "429" @default.
• W1963669015 startingPage "419" @default.
• W1963669015 abstract "the ability of the divalent cation manganese (Mn2+) to substitute for calcium (Ca2+) both in triggering catecholamine release and in stimulating catecholamine synthesis, as indicated by an increase in tyrosine hydroxylase (TOH) phosphorylation, has been determined in bovine adrenal medullary chromaffin cells maintained in tissue culture. Mn2+ was found to enter chromaffin cells through pathways activated by nicotinic receptor stimulation and potassium depolarisation, and via the Nai:Cao exchange mechanism in Na+-loaded cells. Like Ca2+, entry of Mn2+ through these pathways triggered immediate catecholamine release and, like Ca2+, maintained quantitatively comparable release at least up to 40 min. Unlike Ca2+, Mn2+ did not stimulate an increase in TOH phosphorylation in intact chromaffin cells, even over a prolonged time course, but Mn2+ did stimulate increased TOH phosphorylation in lysed cell preparations showing that its lack of effect in the intact cells was not due to inhibition of the specific phosphorylation pathway. In lysed cell preparations, Mn2+ stimulated also phosphorylation of a different spectrum of proteins to Ca2+, and of the same proteins to different extents. In particular, P80 (MARCKS protein) was more intensely phosphorylated in the presence of Mn2+ than in the presence of Ca2+. Since TOH phosphorylation always occurs when intracellular Ca2+ is increased, the absence of an increase with Mn2+ indicates that none of its intracellular effects could have occurred as a consequence of Mn2+ mobilisation of intracellular Ca2+. In summary, the data show that Mn2+ is a surrogate for Ca2+ in triggering and maintaining catecholamine release, but does not substitute for Ca2+ in stimulating TOH phosphorylation." @default.
• W1963669015 created "2016-06-24" @default.
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• W1963669015 date "1996-05-01" @default.
• W1963669015 modified "2023-10-14" @default.
• W1963669015 title "Mn2+ can substitute for Ca2+ in causing catecholamine secretion but not for increasing tyrosine hydroxylase phosphorylation in bovine adrenal chromaffin cells" @default.
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• W1963669015 doi "https://doi.org/10.1016/s0143-4160(96)90115-3" @default.
• W1963669015 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/8793182" @default.
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