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Why sperm do not produce antigens

Sperms are foreign to both the man who produces them and the woman who receives them. In healthy men, sperms do not come in contact with blood. The blood-testis barrier formed by the Sertoli cells in the testes keeps the sperm away from the blood stream. Breach of this barrier, as in the case of infections or injury, may lead to the formation of anti-sperm antibodies in men. Besides, semen also contains immune-suppressive agents secreted by seminal vesicles accessory structure.
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Why is it that sperms are not considered foreign (antigens) by the immune system of women?

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Antisperm antibodies - Wikipedia

PIP: A review of sperm antigens involved in fertilization includes a description of sperm differentiation, seminal fluid components that coat sperm, sperm antigens involved in binding to the zona pellucida ZP , antigens involved in the acrosome reaction, in zona pellucida penetration, and those active in fusion with the ova membrane. Sperm antigens are located in certain domains of the cell, and they are altered during capacitation and passage through the female tract. Caltrin and acrosome-stabilizing factor are applied by seminal fluid. At least 2 antigens have been studied that occur in sterile women, although one cross reacts with milk proteins. Some antigens active in ZP binding are trypsin, proacrosin, acrosin, PH from guinea pigs, and rabbit sperm autoantigen I. Antigens involved in the acrosome reaction, such as M42, are likely to cross react with other body proteins that also entail exocytosis.
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Identification of sperm immunoreactive antigens for immunocontraceptive purposes: a review

Antisperm antibodies ASA may be a reason of infertility in some individuals. They may affect pre- as well as post-fertilization stages of the reproductive process. There is ongoing progress in the identification of sperm antigens related to fertilization.
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Antisperm antibodies are antibodies produced against sperm antigens. ASA can be detected in ejaculate, cervical mucus, follicular fluid, and blood serum. ASA can arise whenever sperm encounter the immune system. However, these antibodies are also present in approximately 1—2.
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    Fenrihn wrote 03.11.2018, 21:08: #1

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