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• W2071959663 abstract "The membrane potential of the frog egg undergoes a transient positive shift at fertilization which is a block to polyspermy. This paper addresses the question of how a sperm elicits this “fertilization potential.” Iontophoretic injection of Ca2+ activates Rana pipiens eggs to develop and initiates a transient, positive-going shift in the membrane potential (the activation potential) which is like the sperm-induced fertilization potential in amplitude, duration, and Cl− dependence. Activation potentials are elicited by Ca2 injection into both animal and vegetal regions of the egg, but the rate of the initial depolarization is much less when Ca2+ is injected into the vegetal region. Injections of K+, Na+, Cl−, or Mg2+ do not result in activation potentials, but the Ca2+ analogs, Sr2+ and Ba2+, can substitute for Ca2+. Treatment of eggs with the divalent cation ionophore, A23187, also initiates a transient, positive-going depolarization. Because injection of Ca2+ is sufficient to elicit a response almost identical to a fertilization potential, the ion transport mechanisms necessary to produce a fertilization potential must preexist in the unfertilized eggs; the sperm contributes only the stimulus to activate these mechanisms. The results reported here suggest that the stimulus may be a rise in free Ca2+." @default.
• W2071959663 created "2016-06-24" @default.
• W2071959663 creator A5085372280 @default.
• W2071959663 date "1981-07-01" @default.
• W2071959663 modified "2023-10-18" @default.
• W2071959663 title "Initiation of the activation potential by an increase in intracellular calcium in eggs of the frog, Rana pipiens" @default.
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• W2071959663 doi "https://doi.org/10.1016/0012-1606(81)90269-4" @default.
• W2071959663 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/6790319" @default.
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