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- W2024953384 abstract "A precocious but limited loss of cortical granules (CG) occurs during mouse oocyte maturation both in vivo and in vitro. Although CG loss during maturation in vivo is not associated with changes in the zona pellucida (ZP), a maturation-associated conversion of ZP2 to ZP2f occurs during oocyte maturation in vitro in serum-free medium. We now demonstrate that a maturation-associated change of ZP3 to ZP3f, as assessed by a reduction in sperm binding, also occurs during maturation in vitro in serum-free medium, and that both newborn calf serum (NCS) and fetuin, each of which inhibits the ZP2 conversion, also inhibit the ZP3 conversion. The concentration-dependence of the NCS- and fetuin-mediated inhibition of the ZP2 conversion, coupled with the concentration of fetuin present in NCS, is consistent with fetuin being the component present in NCS that is primarily responsible for this inhibition. Although NCS can inhibit the ZP modifications that occur during oocyte maturation in vitro, ionophore treatment of eggs, which results in an extensive release of CGs over a short period of time, overcomes the inhibitory effect of NCS on the ZP2 conversion. Results of these studies suggest a potential regulatory function of serum-derived components in the formation of a fertilizable egg." @default.
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- W2024953384 date "1991-11-01" @default.
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- W2024953384 title "Modifications of the Mouse Zona Pellucida during Oocyte Maturation and Egg Activation: Effects of Newborn Calf Serum and Fetuin1" @default.
- W2024953384 doi "https://doi.org/10.1095/biolreprod45.5.783" @default.
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