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- W2046875322 abstract "In our study, we observed the activation of in vitro matured pig oocytes and their subsequent parthenogenetic cleavage after stimulation of ryanodine receptors (RyR) using ryanodine (Ry), caffeine or cyclic adenosine diphosphate ribose (cADPri) or after stimulation of inositol triphosphate receptors (IP(3)R) using D-myo-inositol 1,4,5-triphosphate (IP(3)). Heparin, a potent blocker of IP(3)R, prevented the activation of porcine oocytes using IP(3), but blockers of RyR (ruthenium red or procaine) prevented activation after stimulation by RyR and stimulation by IP(3)R using IP(3). The drugs were injected into oocytes matured to the stage of metaphase II and activation was determined by assessment of pronuclear formation. The activity of H1 kinase was determined and our results demonstrated a significant drop in H1 activity in the activated oocytes. The cleavage of parthenogenetic embryos progresses to more advanced stages after stimulation by IP(3)R than after stimulation by RyR. Our results could indicate that, in pig oocytes, the calcium released from IP(3)-sensitive stores triggers the calcium release from ryanodine-sensitive intracellular stores, which is necessary for oocyte activation. The calmodulin inhibitors ophiobolin A and W7 reduce the activation of oocytes induced by stimulation of RyR or IP(3)R." @default.
- W2046875322 created "2016-06-24" @default.
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- W2046875322 date "2002-04-01" @default.
- W2046875322 modified "2023-10-05" @default.
- W2046875322 title "Activation of in vitro matured pig oocytes using activators of inositol triphosphate or ryanodine receptors" @default.
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- W2046875322 doi "https://doi.org/10.1016/s0378-4320(02)00012-x" @default.
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