# The impact of vaginal microbiota on cervical dendritic cells: an observational study of women from sub-Saharan Africa at high risk for HIV acquisition.

> **NIH NIH K23** · UNIVERSITY OF WASHINGTON · 2020 · $160,812

## Abstract

ABSTRACT
Summary: This proposal supports a five-year training program for Dr. Sabo to gain the skills she needs to
become an independent physician-scientist and an expert in reproductive immunology. Dr. Sabo has a
background in basic science and immunology, and plans to shift her focus to clinically-oriented, translational
research. She has developed a set of aims that align with her research interests, and six core learning objectives
to help her make this transition. Research plan: Bacterial vaginosis (BV) and sub-optimal vaginal bacterial taxa
have been associated with HIV acquisition. The precise mechanism by which this occurs is unknown, but may
be related to increased cervical inflammation. Dendritic cells (DCs) are critical for regulating the inflammatory
state of mucosal tissues, and likely play a role in genital acquisition of HIV. However, DCs remain minimally
characterized in the cervix. The purpose of this proposal is to examine if sub-optimal vaginal bacteria and
increased vaginal bacterial species diversity are associated with increased total cervical DCs. We have
proposed three aims to answer this question. For AIMS 1 and 2, we will perform a cross sectional study of
female sex workers (FSWs) enrolled in a longitudinal, open cohort study in Mombasa, Kenya. Vaginal swabs
and cervical biopsy samples will be collected at a single visit. To determine if high-risk bacterial taxa are
associated with increased DC number (AIM 1), we will evaluate the association between concentrations of
vaginal bacteria (measured by quantitative PCR [qPCR]) and total numbers of cervical DCs (measured by flow
cytometry from tissue digests of cervical biopsies). To examine the relationship between vaginal bacterial
species diversity and cervical DCs (AIM 2), we will perform broad range PCR with high throughput sequencing
of vaginal swabs to calculate the Shannon Diversity Index (SDI) for each patient, and the SDI will be compared
to the number of DCs isolated by flow cytometry. In AIM 3, we will test the hypothesis that treatment of BV
reduces the number of cervical DCs. As an exploratory outcome, DC activation will be assessed by measurement
of cell surface co-stimulatory markers and intracellular pro-inflammatory cytokines for all aims. Together, these
aims have the potential to provide evidence for a mechanistic link between sub-optimal vaginal microbiota,
cervical inflammation, and HIV susceptibility in women. Training plan: The six core learning objectives for this
K23 award period include training in epidemiology, clinical studies, global health, high dimensional data analysis,
mucosal immunology, and the vaginal microbiome. These goals were selected to ensure that Dr. Sabo acquires
the skills necessary to lead her own clinical studies and launch an independent research career performing
translational studies to elucidate the role of the reproductive immune system in health and disease. Training to
complete the six key learning objectives will be achi...

## Key facts

- **NIH application ID:** 10011508
- **Project number:** 1K23HD100221-01A1
- **Recipient organization:** UNIVERSITY OF WASHINGTON
- **Principal Investigator:** Michelle Catherine Sabo
- **Activity code:** K23 (R01, R21, SBIR, etc.)
- **Funding institute:** NIH
- **Fiscal year:** 2020
- **Award amount:** $160,812
- **Award type:** 1
- **Project period:** 2020-04-15 → 2025-03-31

## Primary source

NIH RePORTER: https://reporter.nih.gov/project-details/10011508

## Citation

> US National Institutes of Health, RePORTER application 10011508, The impact of vaginal microbiota on cervical dendritic cells: an observational study of women from sub-Saharan Africa at high risk for HIV acquisition. (1K23HD100221-01A1). Retrieved via AI Analytics 2026-05-22 from https://api.ai-analytics.org/grant/nih/10011508. Licensed CC0.

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