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Persistence of genital tract T cell responses in HIV-infected women on highly active antiretroviral therapy.

ABSTRACT: Initiation of highly active antiretroviral therapy (HAART) for HIV-infected individuals is associated with control of viremia, improved CD4 counts, and declining systemic HIV-specific immune responses. While HAART effectively reduces plasma viremia, it remains unclear how effectively antiretroviral drugs reach mucosal surfaces, such as those of the genital tract. The aim of this study was to determine the effect of HAART on genital tract CD4 T cell reconstitution, HIV shedding, and HIV-specific T cell responses. Cervical cytobrush and blood specimens were obtained from 35 HIV-infected, HAART-naïve women and 27 women on HAART in order to investigate HIV Gag-specific T cell responses by intracellular gamma interferon (IFN-?) staining. Interleukin 1? (IL-1?), IL-6, and IL-8 concentrations were measured by enzyme-linked immunosorbent assays (ELISA). We show that for HIV-infected women, HAART is associated with significantly improved CD4 T cell counts both in blood and at the cervix. While HAART effectively suppressed both blood and cervical viremia, HIV-specific CD8 T cell responses in blood were lost, while those at the cervix were preserved.

SUBMITTER: Mkhize NN

PROVIDER: S-EPMC2950605 | biostudies-literature | 2010 Oct

REPOSITORIES: biostudies-literature

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Persistence of genital tract T cell responses in HIV-infected women on highly active antiretroviral therapy.

Mkhize Nonhlanhla N NN Gumbi Pamela P PP Liebenberg Lenine J LJ Ren Yuan Y Smith Peter P Denny Lynette L Passmore Jo-Ann S JA

Journal of virology 20100804 20

Initiation of highly active antiretroviral therapy (HAART) for HIV-infected individuals is associated with control of viremia, improved CD4 counts, and declining systemic HIV-specific immune responses. While HAART effectively reduces plasma viremia, it remains unclear how effectively antiretroviral drugs reach mucosal surfaces, such as those of the genital tract. The aim of this study was to determine the effect of HAART on genital tract CD4 T cell reconstitution, HIV shedding, and HIV-specific ...[more]

PMID: 20686039

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Project description:IntroductionPrevious studies have shown that alterations of the bacterial microbiota in the lower female genital tract influence susceptibility to HIV infection and shedding. We assessed geographic differences in types of genital microbiota between HIV-infected and uninfected women from Rwanda and the United States.MethodsGenera of lower genital tract bacterial microbiota were identified by high-throughput pyrosequencing of the 16S rRNA gene from 46 US women (36 HIV-infected, 10 HIV-uninfected) and 40 Rwandan women (18 HIV-infected, 22 HIV-uninfected) with similar proportions of low (0-3) Nugent scores. Species of Lactobacillus were identified by assembling sequences along with reference sequences into phylogenetic trees. Prevalence of genera and Lactobacillus species were compared using Fisher's exact tests.ResultsOverall the seven most prevalent genera were Lactobacillus (74%), Prevotella (56%), Gardnerella (55%), Atopobium (42%), Sneathia (37%), Megasphaera (30%), and Parvimonas (26%), observed at similar prevalences comparing Rwandan to US women, except for Megasphaera (20% vs. 39%, p?=?0.06). Additionally, Rwandan women had higher frequencies of Mycoplasma (23% vs. 7%, p?=?0.06) and Eggerthella (13% vs. 0%, p?=?0.02), and lower frequencies of Lachnobacterium (8% vs. 35%, p<0.01) and Allisonella (5% vs. 30%, p<0.01), compared with US women. The prevalence of Mycoplasma was highest (p<0.05) in HIV-infected Rwandan women (39%), compared to HIV-infected US women (6%), HIV-uninfected Rwandan (9%) and US (10%) women. The most prevalent lactobacillus species in both Rwandan and US women was L. iners (58% vs. 76%, p?=?0.11), followed by L. crispatus (28% vs. 30%, p?=?0.82), L. jensenii (20% vs. 24%, p?=?0.80), L. gasseri (20% vs. 11%, p?=?0.37) and L. vaginalis (20% vs. 7%, p?=?0.10).DiscussionWe found similar prevalence of most major bacterial genera and Lactobacillus species in Rwandan and US women. Further work will be needed to establish whether observed differences differentially impact lower genital tract health or susceptibility to genital infections.

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Persistence of genital tract T cell responses in HIV-infected women on highly active antiretroviral therapy.

Publications

Persistence of genital tract T cell responses in HIV-infected women on highly active antiretroviral therapy.

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