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• W2070825180 endingPage "57" @default.
• W2070825180 startingPage "48" @default.
• W2070825180 abstract "In contrast to earlier reports (J. L. Maller and E. G. Krebs, 1980, Curr. Top. Cell. Regul. 16, 271-311; M. Moreau, J. P. Vilian, and P. Guerrier, 1980, Dev. Biol. 78, 201-214; W. J. Wasserman and L. D. Smith, 1981, J. Cell Biol. 89, 389-394; D. Huchon, R. Ozon, E. H. Fischer, and J. G. Demaille, 1981, Mol. Cell. Endocrinol. 22, 211-222) calmodulin preparations isolated from Xenopus laevis ovaries or obtained commercially rarely induced maturation upon microinjection into individual oocytes. Calmodulin injections did result in significant cases of maturation when oocytes were first pretreated (primed) with calcium-free (EGTA) OR-2 and then injected in regular OR-2 medium. However, under these conditions the injected buffer solution alone was sometimes found to induce maturation. Under more optimal priming conditions, cases were found where as high as 100% of the oocytes matured simply by returning them to regular OR-2 medium. To determine which divalent cations could be involved in the priming effects of EGTA pretreatment we repeated the earlier ionophore work of W. J. Wasserman and Y. Masui (1975, J. Exp. Zool. 193, 369-375), looking not just at calcium and magnesium but other divalent cations as well. Several divalent cations (10 mM) were found to induce germinal vesicle breakdown with the following tentative order of efficacy, Co2+ greater than or equal to Zn2+ greater than or equal to Mn2+ greater than Ca2+ greater than Mg2+ greater than Ba2+, regardless of whether or not ionophore A23187 was present. These results, along with other reports in the literature, are discussed with respect to the theory that a rise in free calcium and calmodulin is involved in triggering oocyte maturation; we conclude that neither is involved." @default.
• W2070825180 created "2016-06-24" @default.
• W2070825180 creator A5011341121 @default.
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• W2070825180 date "1987-05-01" @default.
• W2070825180 modified "2023-09-24" @default.
• W2070825180 title "Do calcium and calmodulin trigger maturation in amphibian oocytes?" @default.
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• W2070825180 doi "https://doi.org/10.1016/0012-1606(87)90137-0" @default.
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