Blockade of α 1A-adrenoceptor: A novel possible strategy for male contraception

Abstract

Worldwide almost one quarter of all couples practicing contraception rely on male methods. However, currently available options for male contraception are limited. Thus, it is urgent to develop safe, effective, and reversible male contraceptives. To date, alpha(1)-blockers are the most widely used agents for the treatment of benign prostatic hyperplasia. Several studies reveal that in elderly patients the alpha(1A)-selective antagonist tamsulosin can induce a notably high incidence of ejaculation dysfunction characterized by low ejaculate volume. Recent clinical trials suggest that tamsulosin may effectively inhibit sperm ejaculation in young volunteers. Since alpha(1A)-adrenoceptor subtype plays a dominant role in mediating the contractions of accessory sex organs contributing to ejaculation, we hypothesize that blockade of alpha(1A)-adrenoceptor may suppress the motility of these organs, thereby inhibiting sperm transport and achieving contraception, and the alpha(1A)-selective antagonists can act as a male contraceptive. If our hypotheses can be further supported with clinical trials it will shift the paradigm for male-based contraception and provide a wider range of choice for all.