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Vaginal mucosa serves as an inductive site for tolerance
1Department of Obstetrics, Gynecology, and Reproductive Sciences, Magee-Womens Research Institute, School of Medicine, University of Pittsburgh, Pittsburgh, PA 15213, USA.
Journal of Immunology (Baltimore, Md. : 1950)
|October 25, 2000
Summary
Vaginal exposure to antigen (Ag) during estrus, but not diestrus, induces tolerance in mice. This suggests reproductive tract tolerance is hormonally regulated, unlike other mucosal sites.
Area of Science:
- Immunology
- Reproductive Biology
- Endocrinology
Background:
- Mucosal tolerance is crucial for preventing immune responses to environmental antigens.
- The reproductive tract's role as an inductive site for mucosal tolerance is not fully understood.
- Hormonal regulation of immune responses in the reproductive tract is a key area of investigation.
Purpose of the Study:
- To investigate whether vaginal antigen exposure can induce tolerance.
- To determine if the stage of the estrous cycle influences tolerance induction.
- To explore the hormonal regulation of tolerance induction in the female reproductive tract.
Main Methods:
- Mice received vaginal suppositories containing ovalbumin (OVA) or saline during estrus or diestrus.
- Animals were immunized subcutaneously with OVA/CFA one week later.
- Delayed-type hypersensitivity, lymphocyte proliferation, and serum antibody responses were measured.
Main Results:
- Vaginal OVA exposure during estrus significantly reduced delayed-type hypersensitivity and lymphocyte proliferation.
- No tolerance was observed when OVA was administered during diestrus.
- Serum antibody titers were not significantly decreased in estrus-inoculated mice.
Conclusions:
- The female reproductive tract can serve as an inductive site for antigen-specific tolerance.
- Tolerance induction via vaginal antigen exposure is dependent on the hormonal milieu of the estrous cycle.
- Reproductive tract tolerance differs from other mucosal sites due to its hormonal regulation.