Quantitative modeling predicts mechanistic links between pre-treatment microbiome composition and metronidazole efficacy in bacterial vaginosis.

Abstract:

:Bacterial vaginosis is a condition associated with adverse reproductive outcomes and characterized by a shift from a Lactobacillus-dominant vaginal microbiota to a polymicrobial microbiota, consistently colonized by strains of Gardnerella vaginalis. Metronidazole is the first-line treatment; however, treatment failure and recurrence rates remain high. To understand complex interactions between Gardnerella vaginalis and Lactobacillus involved in efficacy, here we develop an ordinary differential equation model that predicts bacterial growth as a function of metronidazole uptake, sensitivity, and metabolism. The model shows that a critical factor in efficacy is Lactobacillus sequestration of metronidazole, and efficacy decreases when the relative abundance of Lactobacillus is higher pre-treatment. We validate results in Gardnerella and Lactobacillus co-cultures, and in two clinical cohorts, finding women with recurrence have significantly higher pre-treatment levels of Lactobacillus relative to bacterial vaginosis-associated bacteria. Overall results provide mechanistic insight into how personalized differences in microbial communities influence vaginal antibiotic efficacy.

journal_name

Nat Commun

journal_title

Nature communications

authors

Lee CY,Cheu RK,Lemke MM,Gustin AT,France MT,Hampel B,Thurman AR,Doncel GF,Ravel J,Klatt NR,Arnold KB

doi

10.1038/s41467-020-19880-w

subject

Has Abstract

pub_date

2020-12-01 00:00:00

pages

6147

issue

1

issn

2041-1723

pii

10.1038/s41467-020-19880-w

journal_volume

11

pub_type

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