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- W2077256476 abstract "The reinitiation of the meiotic divisions and the release of 45Ca from the Ranapipiens oocyte has been studied as a function of meiotic agonists and antagonists. Each of the meiotic agonists tested (progesterone, insulin, D-600, La3+) caused a decreased 45Ca uptake and an increased efflux during the first 15 min after exposure. The effects of progesterone, D-600, and La3+ are not additive and progesterone will not release additional 45Ca in oocytes pretreated with D-600 or La3+. Tetracaine inhibits both progesterone-induced release of 45Ca and an early step in meiosis (nuclear membrane breakdown). [Tetracaine]o required for 50% inhibition of nuclear breakdown decreases with decreasing [progesterone]o suggesting competitive inhibition. The Ca, Mg-ionophore A23187 shows a similar competitive inhibition of progesterone-induced nuclear breakdown and stimulates a rapid release of 45Ca within the first 1–3 minutes after exposure to the ionophore. Unlike progesterone, insulin, D-600, or La3+, the ionophore A23187 stimulates both uptake and efflux of 45Ca by oocytes. These results suggest that both a reduced influx and a selective release of calcium from specific membrane sites is essential for steroid reinitiation of the meiotic divisions in R.pipiens oocytes." @default.
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- W2077256476 date "1980-11-01" @default.
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- W2077256476 title "Kinetics of calcium efflux and exchange from Rana pipiens oocytes immediately following reinitiation of the first meiotic division: Comparison of various meiotic agonists and antagonists" @default.
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- W2077256476 doi "https://doi.org/10.1016/0143-4160(80)90037-8" @default.
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