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Recording Electrical Currents across the Plasma Membrane of Mammalian Sperm Cells
09:37

Recording Electrical Currents across the Plasma Membrane of Mammalian Sperm Cells

Published on: February 14, 2021

Plasma membrane Ca2+ ATPase 4 is required for sperm motility and male fertility

Kai Schuh1, Elizabeth J Cartwright, Eriks Jankevics

  • 1Institute for Clinical Biochemistry and Pathobiochemistry, University of Wuerzburg, Josef-Schneider-Strasse 2, D-97080 Wuerzburg, Germany. schuh_k@klinik.uni-wuerzburg.de

The Journal of Biological Chemistry
|April 14, 2004
PubMed

Insights

Plasma membrane calcium ATPase 4 (PMCA4) is essential for sperm motility and male fertility. PMCA4 deficiency in mice causes infertility and impaired sperm function, highlighting its critical role in regulating intracellular calcium levels.

Area of Science:

  • Reproductive biology
  • Cellular physiology
  • Biochemistry

Background:

  • Calcium ions (Ca2+) and Ca2+-dependent signals are vital for sperm motility and fertilization.
  • The specific molecular mechanisms governing these Ca2+ pathways in sperm remain incompletely understood.

Purpose of the Study:

  • To investigate the role of plasma membrane calcium/calmodulin-dependent calcium ATPase (PMCA) isoform 4 in sperm function and male fertility.
  • To elucidate the contribution of PMCA4 to the regulation of intracellular Ca2+ levels in sperm.

Main Methods:

  • Generation and analysis of homozygous male mice with a targeted gene deletion of the PMCA4 gene.
  • Assessment of sperm motility in wild-type and PMCA4-deficient mice.
  • Pharmacological inhibition of PMCA activity in wild-type sperm using 5-(and-6)-carboxyeosin diacetate succinimidyl ester.

Main Results:

  • Homozygous male mice lacking PMCA4 were infertile, exhibiting severely impaired sperm motility.
  • PMCA4 is highly enriched in the sperm tail.
  • Inhibition of PMCA activity in wild-type sperm recapitulated the motility defects observed in PMCA4-deficient mice.

Conclusions:

  • PMCA4 plays a pivotal role in regulating sperm function, particularly motility.
  • PMCA4 is critical for maintaining appropriate intracellular Ca2+ levels necessary for mammalian fertilization.
  • Targeting PMCA4 represents a potential strategy for understanding and addressing male infertility.

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