[Peroxiredoxin 4 protects the testis from heat stress]

Area of Science:

• Reproductive Biology
• Oxidative Stress Research
• Genetics and Molecular Biology

Background:

• Heat stress significantly impairs testicular function and spermatogenesis.
• Oxidative stress is a key mechanism underlying heat-induced testicular damage.
• Peroxiredoxin 4 (PRDX4) is an antioxidant enzyme implicated in cellular protection.

Purpose of the Study:

• To investigate the protective role of Peroxiredoxin 4 (PRDX4) in testicular heat stress using a PRDX4 knockout mouse model.
• To assess the impact of PRDX4 deficiency on spermatogenic cell apoptosis and oxidative stress markers following heat exposure.

Main Methods:

• CRISPR/Cas9 technology was used to generate PRDX4 knockout mice, with wild-type mice serving as controls.
• Mice were subjected to controlled testicular heat stress (43°C) or sham treatment (25°C).
• Testicular tissues were analyzed for histological changes, apoptosis (TUNEL), and expression of PRDX4, HNE, and 8-OHdG.

Main Results:

• PRDX4 knockout mice exhibited significantly increased spermatogenic cell apoptosis and elevated 8-OHdG levels post-heat stress compared to wild-type controls.
• While both groups showed increased apoptosis and 8-OHdG after heat stress, the PRDX4 knockout group consistently displayed higher levels, even at 5 weeks.
• Hydroxynonenal (HNE) expression was significantly higher in PRDX4 knockout mice 5 weeks after heat stress, indicating prolonged oxidative damage.

Conclusions:

• Peroxiredoxin 4 (PRDX4) plays a crucial protective role against testicular heat stress.
• PRDX4 deficiency exacerbates heat-induced damage, including increased apoptosis and oxidative stress.
• Targeting PRDX4 may offer therapeutic potential for mitigating male infertility caused by testicular heat stress.