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- W2019989007 abstract "The necessity of calcium (Ca2+) and the Ca2+-calmodulin complex for resumption and completion of meiosis, expansion of cumulus cells, viability and hyaluronidase sensitivity of in vitro cultured bovine cumulus-oocyte complexes was examined by inhibition of the Ca2+-calmodulin complex with eight graduated doses of trifluoperazine (TFP) and by Ca2+ deficiency or depletion. Doses of TFP greater than 2.5 microM decreased the percent of cumulus complexes surviving culture and oocytes completing meiosis, whereas cumulus expansion was unaffected until the cultures contained a near lethal dose (greater than 10 microM). Hyaluronidase caused dispersion of cumulus cells whenever they were expanded regardless of TFP dose. In TC-199 media the completion of meiosis I was suppressed by 0.1 to 1 mM ethylenediaminotetraacetic acid (EDTA) (P less than 0.05) and drastically reduced by 1.0 mM (P less than 0.05). Viability of the cumulus-oocyte complex was not reduced until the dose of EDTA was increased to 1.0 mM (P less than 0.0001). Cumulus expansion was also not suppressed until the dose of EDTA reached 1.0 mM (P less than 0.05). In Ca2+-free (CF) basal media Eagles, completion of meiosis I was reduced by all doses of EDTA (P less than 0.05), whereas viability of the cumulus-oocyte complex was decreased by Ca2+ deficiency or by EDTA addition to basal media Eagles (P less than 0.01). Cumulus expansion was unaffected by Ca2+ removal or chelation. In all experiments, oocytes which were not degenerate underwent germinal vesicle breakdown regardless of treatment." @default.
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- W2019989007 date "1984-08-01" @default.
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- W2019989007 title "Role of Calcium and the Calcium-Calmodulin Complex in Resumption of Meiosis, Cumulus Expansion, Viability and Hyaluronidase Sensitivity of Bovine Cumu lus-Oocyte Complexes" @default.
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- W2019989007 doi "https://doi.org/10.1095/biolreprod31.1.1" @default.
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