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The localization of immunoglobulins A, G and M (IgA, IgG, IgM) in the mouse genital tract was studied by immunoperoxidase techniques at oestrus, on the day of mating and at the time of implantation. In the horns and body of the uterus, IgA and IgG were located in plasma cells in the endometrium surrounding uterine glands and in the gland lumina. The numbers of these plasma cells increased markedly between Day 1 and Days 4 and 5 of pregnancy and the ratio of plasma cells containing IgA and IgG was about 3 or 4 to 1 at all stages. Area measurements indicated that the increased number of plasmacytes was not due to an increase in the amount of endometrial, myometrial or glandular tissues. Plasma cells were not detected in the cervix and vaginal fornix at oestrus and Day 1, but a few were present on Day 5. In the oviduct, plasma cells containing IgA and IgG were present only in the preampulla and both immunoglobulins were present in the extracellular space of the lamina propria only in this region. No IgM was detected in any part of the reproductive tract at any of the times studied. Uteri on Day 1 of pregnancy contained bacteria of several kinds, some of which were aggregated and coated with IgA. This suggests that the uterine lumen at this time may contain specific anti-bacterial IgA antibodies. Our observations indicate that the horns and body of the uterus and the preampulla of the oviduct are major sites of a local immune system in the female mouse genital tract.

Immunohistochemical localization of immunoglobulins A, G and M in the mouse female genital tract