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- W196118840 abstract "The regulation of rat uterine adenylate cyclase (AC) by Mg/sup 2 +/, Mn/sup 2 +/ and Ca/sup 2 +/ was examined during metestrus and proestrus of the estrous cycle and Days 1 and 4 of pseudopregnancy, before and after a mild trauma to the uterus. Mg/sup 2 +/ increased cyclase activity on all days measured. Maximal enzymic activity occurred with 5-10 mM Mg/sup 2 +/ during Day 4 following a mild traumatic stimulus to the uterus. The apparent Ka for Mg/sup 2 +/ was not significantly changed during these days. AC activity as a function of Mn/sup 2 +/ concentration was biphasic. It increased with increasing concentrations of Mn/sup 2 +/ and was maximal at 1.0-2.5 mM during Day 4 following uterine trauma. Higher concentrations of Mn/sup 2 +/ were inhibitory. The apparent Ka for Mn/sup 2 +/ was 0.36 +/- 0.05 mM and was not significantly altered during the days studied. Even though the Ka for Mn/sup 2 +/ was ten-fold lower than that for Mg/sup 2 +/, the Vmaxes shown with both ions were similar. Ca/sup 2 +/ is a potent inhibitor of uterine AC activity. When measured at its I.C./sub 50/, it lowered AC activity as Mg/supmore » 2 +/ concentrations were increased. Ca/sup 2 +/ did not have a significant effect on AC activated by Mn/sup 2 +/. The data showed that Mg/sup 2 +/, Mn/sup 2 +/ and Ca/sup 2 +/ might have important regulatory roles in the activation and inhibition of uterine AC in the rodent.« less" @default.
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- W196118840 date "1987-05-01" @default.
- W196118840 modified "2023-09-26" @default.
- W196118840 title "Regulation of uterine adenylate cyclase by magnesium, manganese and calcium ions" @default.
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