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Oral microbiota in South African adolescents

ABSTRACT: The association between the oral and vaginal microbiota of South African adolescents.

PROVIDER: PRJEB34895 | ENA |

REPOSITORIES: ENA

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Project description:Progestin-based contraception may increase the risk of vaginal HIV acquisition to a level greater than the progesterone-rich luteal phase of the menstrual cycle, which has been demonstrated to have a significantly higher transmission rate compared to the follicular phase. We used pig-tailed macaque (Macaca nemestrina) model to evaluate the effects of administration of the oral the combined oral contraceptives (COCs) depot medroxyprogesterone acetate (DMPA) and levonorgestrel (LNG) on mucosal factors that influence HIV susceptibility. We compared the pH and vaginal epithelial thickness data from previous studies, and evaluated contraception-induced molecular changes in the vagina using transcriptional and cytokine profiling. The administration of DMPA caused a pronounced thinning of the vaginal epilthelium relative to measurements takein in the follicular or luteal phase. DMPA also induced a significant increase in vaginal IL10 expression. Lastly, using RNA-Seq analyses of vaginal biopsies, we noted that both DMPA- and LNG-based contraception induced a signature of gene expression similar to that of the luteal phase, only more exacerbated, and including widespread down-regulation of HIV-restriction genes. Use of progestin-based contraception might engender a milieu that poses an increased risk of HIV transmission than that of the luteal phase via vaginal thinning, induction of immunosuppressive cytokines, and widespread suppression of HIV restriction factors.

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