The effects of guanine nucleotides and protein kinase C on prolactin-stimulated Ca2+ release from intracellular stores of pig oocytes were studied using the fluorescent dye chlorotetracycline. The effect of prolactin was related to the protein kinase C activation. Inhibition of protein kinase C stimulated Ca2+ release from intracellular stores of the pig oocytes treated with 5 ng/ml prolactin in the presence of extracellular Ca2+ and inhibited Ca2+ release from intracellular stores of the pig oocytes treated with 50 ng/ml prolactin. In a Ca2+-free medium, prolactin did not stimulate Ca2+ release from intracellular stores of the oocytes treated with GDP in the presence of GDP. GTP inhibition of protein kinase C activated Ca2+ release from intracellular stores of the pig oocytes treated with 5 ng/ml prolactin and inhibited Ca2+ release from intracellular stores of the pig oocytes treated with 50 ng/ml prolactin. These data suggest the influence of guanine nucleotides and protein kinase C on calcium metabolism, stimulated by prolactin.
Russian Journal of Developmental Biology – Springer Journals
Published: Jun 21, 2005
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