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• W1986003217 abstract "Sperm-borne oocyte-activating factor (SOAF) elicits activation sufficient for full development and originates from sperm head submembrane matrices. SOAF comprises discrete, heat-sensitive and -stable components (referred to here respectively as SOAF-I and -II) which are each necessary but not sufficient to activate oocytes. The heat-sensitive SOAF component, SOAF-I(m), becomes solubilized from the perinuclear matrix under reducing conditions (the SOAF transition) to generate SOAF-I(s). Although calcium transients likely play an important role in oocyte activation at fertilization, the question is open as to whether demembranated heads or SOAF-I(s) and/or SOAF-II can induce calcium transients. We now report that injection of demembranated sperm heads into mouse oocytes efficiently induced Ca(2+) oscillations. When injected independently, SOAF-I(s) and demembranated heads heated to 48 degrees C failed to generate Ca(2+) oscillations. However, co-injection of SOAF-I(s) and 48 degrees C-heated heads induced oscillations, mirroring their synergistic ability to activate oocytes. This suggests that SOAF-mediated activation proceeds via pathways resembling those at fertilization and provides the first direct evidence that multiple sperm components are required to induce Ca(2+) oscillations. We probed the SOAF-I(s) liberation at the center of this activation and show that in vitro it was sensitive to a profile of serine protease inhibitors. These findings support a model in which mammalian oocyte activation, including the induction of calcium transients, involves proteolytic processing of SOAF from sperm head submembrane compartments." @default.
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• W1986003217 date "2000-01-01" @default.
• W1986003217 modified "2023-10-09" @default.
• W1986003217 title "Mammalian Oocyte Activation by the Synergistic Action of Discrete Sperm Head Components: Induction of Calcium Transients and Involvement of Proteolysis" @default.
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• W1986003217 doi "https://doi.org/10.1006/dbio.1999.9552" @default.
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