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Related Experiment Videos

KSper, a pH-sensitive K+ current that controls sperm membrane potential.

Betsy Navarro1, Yuriy Kirichok, David E Clapham

  • 1Howard Hughes Medical Institute, Department of Cardiology, Children's Hospital, Boston, MA 02115, USA.

Proceedings of the National Academy of Sciences of the United States of America
|April 27, 2007
PubMed
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Spermatozoa undergo capacitation in the female reproductive tract, regulated by intracellular pH. Alkalinization activates a potassium current (I(KSper)) that hyperpolarizes the sperm membrane, optimizing calcium entry for fertilization.

Area of Science:

  • Reproductive Biology
  • Sperm Physiology
  • Ion Channel Function

Background:

  • Spermatozoa require capacitation to fertilize an egg.
  • Intracellular pH regulates key sperm functions during capacitation.
  • Spermatozoan alkalinization activates a calcium current (I(CatSper)) essential for hyperactivated motility.

Purpose of the Study:

  • To investigate the effect of intracellular alkalinization on sperm membrane potential.
  • To identify the ion currents responsible for membrane potential changes during capacitation.

Main Methods:

  • Electrophysiological recordings of sperm ion currents.
  • Manipulation of intracellular pH in mammalian spermatozoa.

Main Results:

Related Experiment Videos

  • Intracellular alkalinization induces rapid hyperpolarization of the sperm membrane potential.
  • This hyperpolarization is primarily mediated by a sperm flagellum-derived potassium current (I(KSper)).
  • pH(i)-sensitive I(KSper) activation sets membrane potential for maximal Ca2+ influx via I(CatSper).

Conclusions:

  • A novel outwardly rectifying K+ current (I(KSper)) plays a critical role in sperm capacitation.
  • Regulation of membrane potential by I(KSper) is crucial for optimizing Ca2+ entry required for fertilization.