The blood–testis barrier is a specialized structural and functional barrier formed by tight junctions between Sertoli cells within the seminiferous tubules. Its primary role is to protect developing germ cells from immunological attack while maintaining a controlled microenvironment for spermatogenesis.
Because sperm cells express antigens not present elsewhere in the body, exposure to the systemic immune system may trigger autoimmune reactions. Disruption of the blood–testis barrier due to infection, trauma, inflammation, or toxic exposure can result in impaired spermatogenesis and the formation of anti-sperm antibodies.
From an andrological perspective, preservation of the blood–testis barrier is critical for long-term fertility. Understanding its physiology provides insight into immunological erotic infertility and inflammatory testicular disorders.
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