Oligozoospermia induced by exogenous testosterone is associated with normal functioning residual spermatozoa

Area of Science:

• Reproductive Endocrinology
• Sperm Biology
• Male Contraception

Background:

• Testosterone enanthate is investigated as a male contraceptive agent.
• Hormonal suppression of spermatogenesis can lead to oligozoospermia.
• The functional capacity of residual sperm during suppressed spermatogenesis requires evaluation.

Purpose of the Study:

• To assess the functional capacity of sperm in men with testosterone enanthate-induced oligozoospermia.
• To determine if sperm function is compromised when sperm concentration is reduced by exogenous testosterone.

Main Methods:

• A prospective clinical study involving 8 healthy men receiving weekly testosterone enanthate injections.
• Sperm function tests including acrosome reaction, hyperactivation, and oocyte penetration were performed.
• Semen analysis was conducted during pretreatment, suppression, and recovery phases.

Main Results:

• Testosterone enanthate reduced mean sperm concentration but did not affect sperm motility, characteristics, or morphology.
• Residual sperm demonstrated normal acrosome reaction, hyperactivation, and oocyte penetration capacity.
• Sperm function remained intact despite moderate oligozoospermia induced by testosterone enanthate.

Conclusions:

• Moderate suppression of spermatogenesis (< 10 x 10(6)/mL) with testosterone enanthate does not impair residual sperm function.
• Further research is needed to understand sperm function at very severe oligozoospermia levels (< 1 x 10(6)/mL).
• These findings support the potential of testosterone enanthate for male contraception without compromising sperm functionality.