Alcohol alters blood-testis barrier function in an in vitro model

Area of Science:

• Reproductive biology
• Toxicology
• Cell biology

Background:

• The blood-testis barrier (BTB) is crucial for male fertility, protecting developing sperm cells.
• Alcohol-induced infertility, specifically reversible azoospermia, is a recognized clinical concern.
• The precise mechanisms by which alcohol disrupts BTB integrity remain incompletely understood.

Purpose of the Study:

• To investigate the impact of alcohol on BTB integrity using an in vitro model.
• To identify potential nonhormonal mechanisms contributing to alcohol-related reversible azoospermia.

Main Methods:

• Primary rhesus macaque Sertoli cells were exposed to varying ethanol concentrations (10-100 mM).
• BTB integrity was assessed via electrical resistance and permeability assays.
• Gene expression of tight junction markers and cytokine levels were analyzed post-ethanol exposure and withdrawal.

Main Results:

• Ethanol exposure caused a dose-dependent decrease in BTB integrity.
• Partial recovery of BTB function was observed after 48-hour withdrawal at lower ethanol concentrations (10 and 60 mM).
• Ethanol increased the expression of SOX9 and CLDN3 genes and elevated pro-inflammatory cytokines at higher concentrations.

Conclusions:

• Clinically relevant ethanol concentrations reversibly disrupt BTB function via nonhormonal pathways.
• BTB dysfunction plays a significant role in alcohol-induced reversible azoospermia.
• Findings offer new insights into the molecular basis of alcohol's effects on male reproductive health.