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Sphingolipids modulate redox signalling during human sperm capacitation.

Steven Serafini1,2,3, Cristian O'Flaherty1,2,3,4,5

  • 1Experimental Medicine Division, Department of Medicine, McGill University, Montréal, QC, Canada.

Human Reproduction (Oxford, England)
|December 10, 2024
PubMed
Summary
This summary is machine-generated.

Sphingosine 1-phosphate (S1P) is crucial for human sperm to become fertile. It activates specific receptors and promotes the production of reactive oxygen species, essential for sperm capacitation and fertilizing ability.

Keywords:
human spermatozoalipid signallingnitric oxidereactive oxygen speciesredox signalling

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Area of Science:

  • Reproductive Biology
  • Lipid Signaling
  • Sperm Physiology

Background:

  • Bioactive sphingolipids, including S1P, regulate critical cellular functions like membrane signaling, proliferation, and migration.
  • Understanding sphingolipid roles is vital for reproductive health and fertility research.

Purpose of the Study:

  • To elucidate the role of sphingolipids, particularly S1P, in mediating human sperm capacitation.
  • To identify the specific signaling pathways and molecular interactions involved in S1P-induced sperm function.

Main Methods:

  • Human spermatozoa from healthy donors were incubated with or without sphingolipids (sphingosine, ceramide) and inhibitors.
  • Assays included protein tyrosine phosphorylation, acrosome reaction, nitric oxide production, and sperm viability/motility analysis.
  • Immunocytochemistry was used to localize key signaling molecules.

Main Results:

  • S1P mediates human sperm capacitation by activating the S1PR1 receptor, leading to increased reactive oxygen species (ROS) like nitric oxide and superoxide anion.
  • S1P signaling activates the PI3K-AKT pathway, crucial for nitric oxide production during capacitation.
  • Sphingosine and ceramide promote ROS production, essential for sperm fertilizing competency.

Conclusions:

  • Sphingolipid metabolites are critical for inducing human sperm capacitation, involving pathways like PI3K/AKT/NOS.
  • Novel insights include the role of protein kinase R (PKR) in activating sphingosine kinase 1 (SphK1) and S1P signaling.
  • Findings highlight potential targets for fertility treatments and diagnostics in infertile males.