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- W2074582018 abstract "The objective of this study was to examine the effect of cumulus cell removal from cumulusoocyte complexes (COCs) on meiotic progression. In Experiments 1, 2 and 3, pig COCs were cultured for 16, 20 and 24 h, respectively. The cumulus cells were then removed, and the denuded oocytes were incubated in fresh medium for another 32 h in Experiment 1, for 28 h in Experiment 2 and for 24 h in Experiment 3. In Experiment 4, the denuded oocytes and COCs were co-cultured in a drop of fresh medium from 24 h of cultivation to the end of the culture period (48 h). Removal of the cumulus cells after 16 h of cultivation had no effect on the proportions of oocytes both undergoing germinal vesicle breakdown (GVBD) and reaching MII. When the denuded oocytes were further cultured for 24 h, following the removal of their cumulus cells after 24 h of cultivation, the proportion of oocytes undergoing GVBD was significantly higher (90%, P < 0.05) than that of oocytes that were continuously cultured for 48 h without removing the cumulus cells (80%). Removal of the cumulus cells after 20 and 24 h of incubation produced a significant increase in the proportion of oocytes reaching the MII stage (84%, P < 0.05 and 76%, P < 0.01, respectively) as compared with COCs cultured continuously for 48 h without removing cumulus cells (71% and 55%, respectively). The maturation rate of denuded oocytes co-cultured with COCs for the second 24 h of cultivation was comparable to that of denuded oocytes cultured without COCs (77 and 74%, respectively). From these results, it was concluded that cumulus cells surrounding oocytes suppressed meiosis of both the GVBD process and progression from GVBD to MII in pig oocytes cultured in vitro, and that the suppressive factor in meiotic progression produced by the cumulus cells might be transferred to the oocytes through gap junctions rather than through the medium." @default.
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- W2074582018 title "Cumulus cells suppress meiotic progression in pig oocytes cultured in vitro" @default.
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- W2074582018 doi "https://doi.org/10.1016/0093-691x(96)00116-1" @default.
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