Browsing UMB Open Access Articles 2019 by Subject "vaginal microbiota"
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The Evolving Facets of Bacterial Vaginosis: Implications for HIV TransmissionBacterial vaginosis (BV) is a common yet poorly understood vaginal condition that has become a major focus of HIV transmission and immunology research. Varied terminologies are used by clinicians and researchers to describe microbial communities that reside in the female reproductive tract (FRT), which is driven, in part, by microbial genetic and metabolic complexity, evolving diagnostic and molecular techniques, and multidisciplinary perspectives of clinicians, epidemiologists, microbiologists, and immunologists who all appreciate the scientific importance of understanding mechanisms that underlie BV. This Perspectives article aims to clarify the varied terms used to describe the cervicovaginal microbiota and its "nonoptimal" state, under the overarching term of BV. The ultimate goal is to move toward language standardization in future literature that facilitates a better understanding of the impact of BV on FRT immunology and risk of sexually transmitted infections, including HIV. © Lyle R. McKinnon et al. 2019; Published by Mary Ann Liebert, Inc. 2019.
The vaginal metabolome and microbiota of cervical HPV-positive and HPV-negative women: a cross-sectional analysisObjective: Characterise the vaginal metabolome of cervical HPV-infected and uninfected women. Design: Cross-sectional. Setting: The Center for Health Behavior Research at the University of Maryland School of Public Health. Sample: Thirty-nine participants, 13 categorised as HPV-negative and 26 as HPV-positive (any genotype; HPV+), 14 of whom were positive with at least one high-risk HPV strain (hrHPV). Method: Self-collected mid-vaginal swabs were profiled for bacterial composition by 16S rRNA gene amplicon sequencing, metabolites by both gas and liquid chromatography mass spectrometry, and 37 types of HPV DNA. Main outcome measures: Metabolite abundances. Results: Vaginal microbiota clustered into Community State Type (CST) I (Lactobacillus crispatus-dominated), CST III (Lactobacillus iners-dominated), and CST IV (low-Lactobacillus, ‘molecular-BV’). HPV+ women had higher biogenic amine and phospholipid concentrations compared with HPV– women after adjustment for CST and cigarette smoking. Metabolomic profiles of HPV+ and HPV− women differed in strata of CST. In CST III, there were higher concentrations of biogenic amines and glycogen-related metabolites in HPV+ women than in HPV– women. In CST IV, there were lower concentrations of glutathione, glycogen, and phospholipid-related metabolites in HPV+ participants than in HPV–participants. Across all CSTs, women with hrHPV strains had lower concentrations of amino acids, lipids, and peptides compared with women who had only low-risk HPV (lrHPV). Conclusions: The vaginal metabolome of HPV+ women differed from HPV− women in terms of several metabolites, including biogenic amines, glutathione, and lipid-related metabolites. If the temporal relation between increased levels of reduced glutathione and oxidised glutathione and HPV incidence/persistence is confirmed in future studies, anti-oxidant therapies may be considered as a non-surgical HPV control intervention. Tweetable abstract: Metabolomics study: Vaginal microenvironment of HPV+ women may be informative for non-surgical interventions