Physical exercise activates the poly(ADP-ribosyl)ation system in rat testes

Area of Science:

• Reproductive Biology
• Exercise Physiology
• Toxicology

Background:

• The male reproductive system is sensitive to oxidative stress and temperature.
• Genotoxic stress can impact germ cell health and function.
• The poly(ADP-ribosyl)ation system is a sensitive biomarker for genotoxic stress.

Purpose of the Study:

• To evaluate germ cell apoptosis and poly(ADP-ribosyl)ation system activation in rat testes after treadmill training.
• To differentiate the effects of mild vs. strong training protocols and acute exercise.
• To assess adaptive responses to exercise-induced stress in the male reproductive system.

Main Methods:

• Adult rats underwent 10-week treadmill training (mild or strong protocols).
• Testicular tissue was analyzed 24 hours post-training or after acute swimming exercise.
• Germ cell apoptosis was measured via caspase-induced poly(ADP-ribose) polymerase fragmentation and TUNEL assay.
• Poly(ADP-ribose) polymerase and poly(ADP-ribose) glycohydrolase enzyme activities were assessed.

Main Results:

• Both training and acute exercise marginally increased germ cell apoptotic indexes.
• Acute exercise was associated with reversible genotoxic stress, indicated by enzyme activity changes.
• Treadmill training induced adaptive responses, activating the poly(ADP-ribose) polymerase system without increasing apoptosis.

Conclusions:

• Exercise, particularly acute bouts, can induce transient genotoxic stress in the male reproductive system.
• Chronic treadmill training promotes adaptive mechanisms, mitigating exercise-induced germ cell apoptosis.
• The poly(ADP-ribosyl)ation system is a valuable indicator of stress and adaptation in testicular tissue during exercise regimes.