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• W2144964857 startingPage "C1795" @default.
• W2144964857 abstract "By using the whole cell voltage-clamp technique, we studied changes in plasma membrane permeability at different meiotic stages of bovine oocytes. Follicular oocytes were matured in vitro and activated by Ca(2+) ionophore. Oocytes at germinal vesicle (GV), germinal vesicle breakdown (GVBD), metaphase I (MI), metaphase II (MII), and meiosis exit were used for electrophysiological recording. By clamping the oocytes at -30 mV, we found that the L-type voltage-dependent Ca(2+) channels were active at the GV stage and that their activity decreased after the GVBD stage. Furthermore, the resting potential decreased from the GV to the MI stage and increased again at MII. A significant decrease of the steady-state conductance occurred from the GV to the MI stage, followed by a sharp increase at the MII stage. With the addition of organic L-type Ca(2+) channel blockers (nifedipine and verapamil), we inhibited the Ca(2+) currents. However, only in the case of verapamil was there a decrease of in vitro maturation efficiency. Our results suggest that, in addition to the cumulus-oocyte junctions, the plasma membrane channels provide another mode of Ca(2+) entry into bovine oocytes during meiosis." @default.
• W2144964857 created "2016-06-24" @default.
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• W2144964857 date "2000-12-01" @default.
• W2144964857 modified "2023-10-18" @default.
• W2144964857 title "Ca²⁺current activity decreases during meiotic progression in bovine oocytes" @default.
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• W2144964857 doi "https://doi.org/10.1152/ajpcell.2000.279.6.c1795" @default.
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