Gradual decrease in spermatogenesis caused by chronic stress

Area of Science:

• Reproductive Biology
• Endocrinology
• Toxicology

Background:

• Chronic stress negatively impacts male reproductive health, causing reduced sperm quality and testicular damage.
• Previous research indicates stress affects oxidative status and induces apoptosis in testes, but germ cell morphology changes remain understudied.

Purpose of the Study:

• To investigate the morphological alterations in testicular germ cells of male rats subjected to varying durations of chronic stress.
• To correlate these morphological changes with hormonal (testosterone, corticosterone) and spermatogenic parameters.

Main Methods:

• Adult male rats were exposed to chronic stress via cold-water immersion (ICW) for 3, 8, 20, or 50 days.
• Testicular tissue was examined for germ cell morphology and seminiferous tubule structure.
• Plasma levels of testosterone and corticosterone were measured.

Main Results:

• Chronic stress led to progressive germ cell loss and disrupted spermatogenesis across all stress durations (3-50 days).
• Degenerative signs in seminiferous tubules included basal epithelial vacuoles and exfoliated germ cells.
• Testosterone levels decreased, while corticosterone levels increased, correlating with stress exposure.

Conclusions:

• Chronic stress induces significant, dose-dependent morphological damage to testicular germ cells, contributing to male infertility.
• Hormonal imbalances, specifically reduced testosterone and elevated corticosterone, are associated with stress-induced testicular damage.