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- W2018017974 abstract "Isolated oocytes from 30 unstimulated Xenopus laevis females required from 2.50 +/- 0.13 to 14.59 +/- 0.77 hr after progesterone exposure for the first 50% of each group to complete meiotic maturation. Injecting 8 females with an amount of hCG not causing ovulation (25 micrograms, 96 IU) lowered oocyte maturation times by 45-83%. An enzyme-linked immunosorbent assay (ELISA) of the blood of 18 unstimulated animals found a constituent which bound to anti-hCG in amounts (equivalent to 0-1.03 micrograms/ml hCG) that had a direct relationship to the rates of GVBD in oocytes. Preincubation of manually isolated follicles in 0.25-1.25 micrograms/ml hCG shortens oocyte maturation times by 18-50% in a direct, nonlinear fashion and this priming effect is reversed when hCG is withdrawn. The action of gonadotropins in facilitating germinal vesicle breakdown (GVBD) mimics the previously reported priming effect produced by preincubation of oocytes in subthreshold levels of progesterone. Evidence suggests that individual variation in the time course of progesterone-induced meiotic maturation of amphibian oocytes is the result of priming differences caused by the action on follicle cells of fluctuating blood levels of an LH-like hormone." @default.
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- W2018017974 title "Gonadotropins and the timing of progesterone-induced meiotic maturation of Xenopus laevis oocytes" @default.
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- W2018017974 doi "https://doi.org/10.1016/0012-1606(85)90343-4" @default.
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