Women constitute nearly half of the 33 million HIV-1-infected individuals in the world and the vast majority acquire this infection heterosexually. Multiple lines of evidence suggest that female sex hormones alter susceptibility of HIV-1 (HIV) as well as disease progression, but mechanisms underlying this are unknown. Expression of the HIV coreceptor, CCR5, and its ligands, the p-chemokines, has been strongly linked to HIV susceptibility and disease progression, however their relative importance in vivo is controversial. Preliminary data from our and other laboratories suggest that estrogen (E) and progesterone (P) alter expression of CCR5 and its ligands in whole blood (WB) and the female genital tract. Specifically, E upregulates CCR5 and its ligands, whereas P downregulates them. We hypothesize that both E and P modulate CCR5 and one of its most important and abundant ligands, CCL5, but changes in CCL5 predominate. In the proposed studies, the influence of E and P on HIV coreceptors and their ligands will be determined by studying three cohorts of women before and after hormonal therapy: reproductive-age women who undergo gonadotrophin- releasing hormone agonist-induced sex hormone suppression randomized to E or placebo for 3 months then P for 2 weeks in the third month;postmenopausal women randomized to E or placebo for 4 weeks followed by E+P for 12 days;and HIV seropositive postmenopausal women who receive E for 4 weeks followed by E+P for 12 days. CCR5 and CXCR4 density will be determined by flow cytometric analysis of whole blood and cervical CD4+ T cells;inducible and constitutive p-chemokine and CXCL12 production will be measured in whole blood and cervical lavage specimens by ELISA;PBMC CCR5, CXCR4, and CCL5 mRNA will be determined by RT PCR;and, in HIV seropositive women, plasma and genital tract viral load will be measured. Knowledge of the influence of physiologic levels of E, P and aging on HIV chemokine coreceptors, their ligands, and genital tract viral load could provide mechanistic insight into the biology of HIV transmission and disease progression in women. Ultimately, this information is needed to develop rational standard practices of prescribing hormonal therapies to HIV infected women at all stages of life.

Public Health Relevance

Research has suggested that sex hormones may alter a woman's susceptibility to HIV. A receptor called CCR5 is required for HIV to infect CD4+ T cells and may be regulated by female sex hormones. This study will evaluate the influence of female sex hormones and aging on HIV biology, information critically needed to provide rational medical care for women at all stages of life.

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Clinical Investigator Award (CIA) (K08)
Project #
5K08AI080285-02
Application #
7933669
Study Section
Acquired Immunodeficiency Syndrome Research Review Committee (AIDS)
Program Officer
Sharma, Opendra K
Project Start
2009-09-18
Project End
2014-07-31
Budget Start
2010-08-01
Budget End
2011-07-31
Support Year
2
Fiscal Year
2010
Total Cost
$132,181
Indirect Cost
Name
University of Colorado Denver
Department
Internal Medicine/Medicine
Type
Schools of Medicine
DUNS #
041096314
City
Aurora
State
CO
Country
United States
Zip Code
80045
Wu, Yongxia; Heinrichs, Jessica; Bastian, David et al. (2015) MicroRNA-17-92 controls T-cell responses in graft-versus-host disease and leukemia relapse in mice. Blood 126:1314-23
Meditz, Amie L; Moreau, Kerrie L; MaWhinney, Samantha et al. (2012) CCR5 expression is elevated on endocervical CD4+ T cells in healthy postmenopausal women. J Acquir Immune Defic Syndr 59:221-8
Meditz, Amie L; Haas, Michelle K; Folkvord, Joy M et al. (2011) HLA-DR+ CD38+ CD4+ T lymphocytes have elevated CCR5 expression and produce the majority of R5-tropic HIV-1 RNA in vivo. J Virol 85:10189-200