Membrane hyperpolarization removes inactivation of Ca2+ channels, leading to Ca2+ influx and subsequent initiation of sperm motility in the common carp.

@article{Krasznai2000MembraneHR,
  title={Membrane hyperpolarization removes inactivation of Ca2+ channels, leading to Ca2+ influx and subsequent initiation of sperm motility in the common carp.},
  author={Zo{\'a}rd Tibor Krasznai and Ter{\'e}z M{\'a}ri{\'a}n and Hiroko Izumi and S{\'a}ndor Damjanovich and Laszlo Balkay and Lajos Tr{\'o}n and Masaaki Morisawa},
  journal={Proceedings of the National Academy of Sciences of the United States of America},
  year={2000},
  volume={97 5},
  pages={2052-7}
}
Change of osmolality surrounding spawned sperm from isotonic to hypotonic causes the initiation of sperm motility in the common carp. Here we show that membrane-permeable cAMP does not initiate motility of carp sperm that is quiescent in isotonic solution, and that motility of the demembranated sperm can be reactivated without cAMP. Furthermore, the cAMP level does not change during the initiation of sperm motility, and inhibitors of protein kinase do not affect sperm motility, suggesting that… CONTINUE READING
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