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Methods for the Discovery of Novel Compounds Modulating a Gamma-Aminobutyric Acid Receptor Type A Neurotransmission
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Binding of [

Kaori Mikami-Takei1, Ikuo Yasumasu1

  • 1Department of Biology, School of Education, Waseda University, 1-6-1, Nishiwaseda, Shinjuku-ku, Tokyo 169.

Development, Growth & Differentiation
|June 7, 2023
PubMed
Summary

Sea urchin sperm plasma membranes contain proteins that bind to calcium channel blockers. These proteins, identified using [3H]nitrendipine, are likely voltage-dependent calcium channels, similar to those found in mammalian cells.

Area of Science:

  • Marine Biology
  • Biochemistry
  • Molecular Biology

Background:

  • Sperm plasma membranes play crucial roles in fertilization and cellular processes.
  • Voltage-dependent calcium channels are essential for regulating calcium influx in excitable cells.

Purpose of the Study:

  • To identify and characterize potential calcium channels in sea urchin sperm plasma membranes.
  • To investigate the binding of specific calcium channel antagonists to sperm membrane proteins.

Main Methods:

  • Isolation of plasma membrane fractions from four species of sea urchin sperm.
  • Electrophoretic analysis of membrane proteins.
  • Binding assays using [3H]nitrendipine, a voltage-dependent calcium channel antagonist.
  • Competitive binding studies with nifedipine and diltiazem.

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Main Results:

  • Similar electrophoretic profiles were observed across the four sea urchin species.
  • Several sperm membrane proteins bound [3H]nitrendipine, albeit at higher concentrations than in muscle and nerve cells.
  • Nifedipine and diltiazem modulated the binding of [3H]nitrendipine to specific proteins (210, 140, 130, and 110 kDa), indicating their interaction with calcium channels.
  • Diltiazem's effect mimicked that observed in mammalian excitable membranes.

Conclusions:

  • Sea urchin sperm plasma membranes possess proteins that function as voltage-dependent calcium channels.
  • These identified calcium channels share similarities with mammalian counterparts.
  • The findings provide insights into the molecular mechanisms of calcium regulation in sea urchin sperm.