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Author Spotlight: Developing Tools to Tune the Activity of Tyrosine Phosphatases
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Tyrosine phosphorylation signaling regulates Ca

Nicolás Gastón Brukman1, Sol Yanel Nuñez1, Lis Del Carmen Puga Molina1

  • 1Instituto de Biología y Medicina Experimental (IByME-CONICET), Ciudad Autónoma de Buenos Aires, Buenos Aires, Argentina.

Journal of Cellular Physiology
|September 12, 2018
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Summary

Protein tyrosine phosphorylation (pTyr) acts as an intracellular sensor for calcium (Ca2+) signaling during human sperm capacitation, regulating CatSper channel activity and sperm motility.

Keywords:
calciumcapacitationintracellular pHspermtyrosine phosphorylation

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Area of Science:

  • Reproductive Biology
  • Sperm Physiology
  • Cell Signaling

Background:

  • Sperm capacitation is essential for fertilization and involves complex signaling pathways.
  • Protein tyrosine phosphorylation (pTyr) and intracellular Ca2+ levels increase during capacitation.
  • Proline-rich tyrosine kinase 2 (PYK2) inhibition blocks pTyr signaling in human sperm.

Purpose of the Study:

  • To investigate if the PYK2-dependent pTyr cascade acts as a Ca2+ sensor during human sperm capacitation.
  • To elucidate the role of PYK2 in regulating Ca2+ signaling and CatSper activity.

Main Methods:

  • Utilized flow cytometry to measure intracellular Ca2+ levels.
  • Administered PYK2 inhibitor (PF431396) and observed effects on Ca2+, pH, and CatSper activity.
  • Performed time course studies and induced intracellular alkalinization with NH4Cl.

Main Results:

  • PF431396 significantly reduced intracellular Ca2+ levels and CatSper activity in a dose-dependent manner.
  • PF431396 treatment led to sustained decreases in intracellular Ca2+ and pH.
  • Intracellular alkalinization reverted Ca2+ level and motility decreases without affecting pTyr blockage.

Conclusions:

  • pTyr signaling acts as an intracellular sensor for Ca2+ entry in human sperm.
  • PYK2 regulates Ca2+ signaling and cytoplasmic pH during capacitation.
  • These findings enhance understanding of signaling pathways governing human sperm capacitation and motility.