Hydrogen Sulfide As a Potential Target in Preventing Spermatogenic Failure and Testicular Dysfunction

Area of Science:

• Reproductive biology
• Biochemistry
• Oxidative stress research

Background:

• Testis and sperm are vulnerable to inflammation and oxidative stress.
• The role of hydrogen sulfide (H2S) in male reproduction was previously unclear.
• H2S is a key signaling molecule in inflammatory and oxidative stress pathways.

Purpose of the Study:

• To investigate the function of H2S in regulating the male reproductive system.
• To understand the link between H2S levels and male fertility.
• To explore H2S's therapeutic potential in male reproductive dysfunction.

Main Methods:

• Measured H2S concentration and cystathionine β-synthase (CBS) expression in human seminal plasma and sperm.
• Assessed the effect of exogenous H2S on sperm motility in asthenospermic patients.
• Utilized animal models (LPS-treated, diabetic, CBS-deficient mice) to study H2S deficiency effects on sperm motility and spermatogenesis.
• Investigated the impact of stress on endogenous H2S production and CBS expression.
• Examined the effects of exogenous H2S and CBS overexpression on spermatogenic failure.

Main Results:

• Subfertile and infertile patients, particularly those with asthenospermia, showed reduced seminal plasma H2S and diminished sperm CBS expression.
• Exogenous H2S administration enhanced sperm motility in asthenospermic patients.
• H2S deficiency in animal models correlated with decreased sperm motility.
• Stress-induced reductions in H2S and CBS were linked to impaired spermatogenesis and a compromised blood-testis barrier.
• Exogenous H2S or CBS overexpression ameliorated spermatogenic failure.

Conclusions:

• Hydrogen sulfide (H2S) is crucial for maintaining male fertility and testicular health.
• H2S protects against spermatogenic failure and testicular dysfunction through its anti-inflammatory and antioxidative properties.
• Findings suggest H2S as a potential therapeutic target for male reproductive disorders.