The goal of Project 3 is to address key questions with respect to the role of mucosa-associated lymphoid tissues of the female reproductive tract (FRT) in HIV pathogenesis. Our overall hypothesis is that changes in the immune microenvironment of the FRT affect HIV disease progression. We will test this hypothesis in three specific aims.
In Specific Aim 1, we will define the effects of aging on innate and adaptive cellmediated immune responses in blood and the female reproductive tract, and the potential impact of these effects on HIV pathogenesis and disease progression. Gender-based differences in immune function may be related to regulation by male and female sex hormones. Reproductive aging and menopause, characterized by a decline of estrogen levels, may affect function of estrogen-responsive immune cells, including T- and Blymphocytes and NK cells. We will test the hypothesis that reproductive aging alters cell-mediated immunity and the immune microenvironment of the FRT, potentially influencing HIV disease course.
In Specific Aim 2, we will determine the effects of HIV infection on mucosal tissues of the female reproductive and gastrointestinal tracts in individuals at opposite ends of the disease spectrum, contrasting natural HIV controllers with off-treatment progressors. The majority of HIV transmission occurs via sexual contact across the mucosal surfaces of the cervix, vagina, and rectum. Although these tissues are key to HIV transmission and pathogenesis, studies of host-virus interactions at these sites have been limited. We hypothesize that the structural and functional changes in the reproductive mucosal tissues of HIVinfected women may parallel those observed in the Gl tract, in particular with respect to parameters such as CD4 memory subset depletion, immune activation, and regulatory T cells.
In Specific Aim 3, we will define the effects of HIV infection on mucosal tissues of the FRT and the gastrointestinal tract in HAART recipients with low versus high recovery of blood CD4 cells. Individual responses to HAART vary significantly, and 10-30% of treated patients never reach the desired threshold of CD4 repopulation. We hypothesize that HAART-induced reconstitution of CD4 cells in the FRT may lag behind peripheral blood, paralleling the delayed reconstitution observed in the Gl tract. We will determine the effects of HIV infection on mucosal tissues of the FRT and the Gl tract in HAART recipients with low versus high recovery of blood CD4 cells. Taken together, these studies should provide many new insights into the role of the upper FRT in HIV pathogenesis. These studies are highly collaborative and will involve the Pis of Projects 1 and 2 as Co-Investigators or Collaborators.
The goal of this project is to increase our understanding of the role of immune cells located in the female reproductive tract in fighting HIV. Most clinical studies of HIV disease have focused on blood rather than on tissues;however, the reproductive tract is often the first site of viral entry into the body. The reproductive tract is also very rich in immune cells that may differ from those in blood. We do not yet understand how these local defenses deal with HIV infection. Thus, the objective of this proposal is to shed new light on potentially important defense mechanisms in the female reproductive tract.
|Chen, Joseph C; Hoffman, Jacquelyn R; Arora, Ripla et al. (2016) Cryopreservation and recovery ofÂ human endometrial epithelial cellsÂ with high viability, purity, andÂ functional fidelity. Fertil Steril 105:501-510.e1|
|Shanmugasundaram, Uma; Hilton, Joan F; Critchfield, J William et al. (2016) Effects of the levonorgestrel-releasing intrauterine device on the immune microenvironment of the human cervix andÂ endometrium. Am J Reprod Immunol 76:137-48|
|Oh, Sam S; Galanter, Joshua; Thakur, Neeta et al. (2015) Diversity in Clinical and Biomedical Research: A Promise Yet to Be Fulfilled. PLoS Med 12:e1001918|
|Goldfien, Gabriel A; Barragan, Fatima; Chen, Joseph et al. (2015) Progestin-Containing Contraceptives Alter Expression of Host Defense-Related Genes of the Endometrium and Cervix. Reprod Sci 22:814-28|
|Smith-McCune, Karen; Chen, Joseph C; Greenblatt, Ruth M et al. (2015) Unexpected Inflammatory Effects of Intravaginal Gels (Universal Placebo Gel and Nonoxynol-9) on the Upper Female Reproductive Tract: A Randomized Crossover Study. PLoS One 10:e0129769|
|Gesner, Marianne; Maiti, Mekhala; Grant, Robert et al. (2014) Fluorescence-linked Antigen Quantification (FLAQ) Assay for Fast Quantification of HIV-1 p24(Gag). Bio Protoc 4:|
|Zirafi, Onofrio; Kim, Kyeong-Ae; Roan, Nadia R et al. (2014) Semen enhances HIV infectivity and impairs the antiviral efficacy of microbicides. Sci Transl Med 6:262ra157|
|Usmani, Shariq M; Zirafi, Onofrio; MÃ¼ller, Janis A et al. (2014) Direct visualization of HIV-enhancing endogenous amyloid fibrils in human semen. Nat Commun 5:3508|
|Cavrois, Marielle; Neidleman, Jason; Greene, Warner C (2014) HIV-1 Fusion Assay. Bio Protoc 4:|
|Shanmugasundaram, Uma; Critchfield, J William; Pannell, Jane et al. (2014) Phenotype and functionality of CD4+ and CD8+ T cells in the upper reproductive tract of healthy premenopausal women. Am J Reprod Immunol 71:95-108|
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