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Functional role of caspases in heat-induced testicular germ cell apoptosis

Yanira Vera1, Susana Rodriguez, Mark Castanares

  • 1Division of Endocrinology, Department of Medicine, Harbor-UCLA Medical Center and Los Angeles Biomedical Research Institute, David Geffen School of Medicine at UCLA, Torrance, California 90509, USA.

Biology of Reproduction
|October 29, 2004
PubMed

Insights

A broad-spectrum caspase inhibitor, Q-VD-OPH, significantly prevented heat-induced germ cell apoptosis by 67%. This finding highlights caspases

Area of Science:

  • Reproductive biology
  • Cell biology
  • Toxicology

Background:

  • Heat stress is a known inducer of germ cell apoptosis.
  • Caspases play a critical role in mediating apoptosis.
  • The specific role of caspases in heat-induced germ cell apoptosis requires further elucidation.

Purpose of the Study:

  • To investigate the potential of a pan-caspase inhibitor to prevent or reduce heat-induced germ cell apoptosis.
  • To determine the involvement of caspase activation in testicular germ cell death following heat exposure.
  • To explore the protective effects of Q-VD-OPH and minocycline on testicular germ cells against hyperthermia.

Main Methods:

  • Adult C57BL/6 mice were pretreated with either vehicle (DMSO) or a pan-caspase inhibitor (Q-VD-OPH).
  • Local testicular heating (43°C for 15 min) was applied, followed by sample collection 6 hours later.
  • Germ cell apoptosis was quantified using TUNEL assay, and caspase activation was assessed.
  • Mitochondrial cytochrome c release and DIABLO translocation were evaluated, alongside electron microscopy for cell morphology.

Main Results:

  • Mild testicular hyperthermia significantly increased germ cell apoptosis compared to controls.
  • Q-VD-OPH pretreatment markedly inhibited caspase 3 activation and reduced germ cell apoptosis by 67.0%.
  • The protective effect of Q-VD-OPH was independent of mitochondrial cytochrome c and DIABLO release.
  • Minocycline also demonstrated protective effects against heat-induced germ cell apoptosis, corroborating the role of caspases.

Conclusions:

  • Caspase activation is a critical mediator of heat-induced germ cell apoptosis.
  • Broad-spectrum caspase inhibitors, such as Q-VD-OPH, can effectively prevent germ cell loss due to heat stress.
  • Targeting caspases represents a potential therapeutic strategy to protect male fertility from thermal injury.

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