Journal
AMERICAN JOURNAL OF REPRODUCTIVE IMMUNOLOGY
Volume 63, Issue 6, Pages 544-565Publisher
WILEY
DOI: 10.1111/j.1600-0897.2010.00842.x
Keywords
Epithelial cells; estradiol; female reproductive tract; mucosal immunity
Categories
Funding
- National Institutes of Health [AI-51877, AI-13541, AI-071761]
- Bill & Melinda Gates Foundation
- NATIONAL INSTITUTE OF ALLERGY AND INFECTIOUS DISEASES [R56AI071761, R01AI071761, R01AI013541, R55AI013541, R37AI013541] Funding Source: NIH RePORTER
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The immune system in the female reproductive tract (FRT) does not mount an attack against HIV or other sexually transmitted infections (STI) with a single endogenously produced microbicide or with a single arm of the immune system. Instead, the body deploys dozens of innate antimicrobials to the secretions of the female reproductive tract. Working together, these antimicrobials along with mucosal antibodies attack many different viral, bacterial and fungal targets. Within the FRT, the unique challenges of protection against sexually transmitted pathogens coupled with the need to sustain the development of an allogeneic fetus have evolved in such a way that sex hormones precisely regulate immune function to accomplish both tasks. The studies presented in this review demonstrate that estradiol and progesterone secreted during the menstrual cycle act both directly and indirectly on epithelial cells and other immune cells in the reproductive tract to modify immune function in a way that is unique to specific sites throughout the FRT. As presented in this review, studies from our laboratory and others demonstrate that the innate immune response is under hormonal control, varies with the stage of the menstrual cycle, and as such is suppressed at mid-cycle to optimize conditions for successful fertilization and pregnancy. In doing so, a window of STI vulnerability is created during which potential pathogens including HIV enter the reproductive tract to infect host targets.
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