The blood–testis barrier (BTB) is a specialized physiological structure that separates developing germ cells from systemic circulation. Formed by tight junctions between Sertoli cells, the BTB plays a critical role in maintaining an immunologically privileged environment within the testes.
Spermatogenic cells express antigens that emerge after immune system maturation, making them vulnerable to autoimmune attack if exposed. The BTB prevents immune recognition while allowing selective transport of nutrients, hormones, and signaling molecules necessary for spermatogenesis.
Disruption of the BTB—due to infection, trauma, inflammation, or toxic exposure—can lead to antisperm antibody formation and impaired fertility. In clinical andrology, BTB integrity is increasingly recognized as a determinant of long-term erotic reproductive viability and immune tolerance.
Leave a Reply