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Immunology Factors

Anti-sperm antibodies can occur in both men and women. Antibodies are protein molecules that are attracted to a specific site on the sperm. Once attached, they may interfere with the sperm's activity in any of several ways. They may immobilize sperm, cause them to clump together, limit their ability to pass through the cervical mucus, or prevent them from binding to and penetrating the egg. Anti-sperm antibodies are frequently seen in men after vasectomy, testicular injury or infection. The cause of anti-sperm antibodies in the woman is unknown.

Researchers classify specific antibodies by type (IgA, IgG and IgM) as well as the point at which they attach to the sperm (head, midpiece, or tail). Studies indicate that IgG type antibodies are most common in men and that IgA type can be found in women's mucus and follicular fluid, but the significance of these findings is uncertain. Binding to the head is believed to interfere with attachment and penetration of the egg, while tail binding interferes with motility.

Unfortunately, testing and identification of type of antibody or the location does little to suggest who will or won't conceive. Attempts to treat the condition -- say, by lowering antibody levels with steroids or removing the antibodies from sperm -- have demonstrated limited benefit and have been fraught with disastrous complications. A trial of ovulation induction and insemination followed by in vitro fertilization with ICSI (a process that involves injecting a sperm directly into an egg) seems to be the best treatment available.

Between 20 and 25 percent of all repeated miscarriages are due to immunological problems. In some cases, the woman's immune system causes her body to reject the fetus as foreign tissue. This problem can often be solved by injecting white blood cells from the woman's partner into her body before conception, so that her body gets "used to" his cells and therefore "recognizes" the fetus later on as "friendly." Some clinics report about a 70 percent success rate using this method.

Other immunological causes involve women who produce antibodies that indirectly cause clotting in blood vessels leading to the developing fetus. The fetus is deprived of nutrients and dies in utero, which triggers an abortion. There are no definitive treatments, but some clinics are looking into combining acetylsalicylic acid (pain relievers), corticosteroids, or anticoagulants such as heparin.



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Statements and opinions expressed in articles and elsewhere on this site are not necessarily those of Earth's Magic Inc. and should not be considered facts. The information published on this site by Earth's Magic Inc / BabyHopes.com is without any warranty of any kind, express or implied, and is not liable for its accuracy, for mistakes, errors, or omissions of any kind, nor for any loss or damage caused by a user's reliance on information obtained from the site. If you have questions or concerns regarding your physical or mental health or the health of your baby, please seek assistance from a qualified healthcare provider.

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