title: Identification of novel inhibitors of nonreplicating Mycobacterium tuberculosis using a carbon starvation model.
abstract: During Mycobacterium tuberculosis infection, a population of bacteria is thought to exist in a nonreplicating state, refractory to antibiotics, which may contribute to the need for prolonged antibiotic therapy. The identification of inhibitors of the nonreplicating state provides tools that can be used to probe this hypothesis and the physiology of this state. The development of such inhibitors also has the potential to shorten the duration of antibiotic therapy required. Here we describe the development of a novel nonreplicating assay amenable to high-throughput chemical screening coupled with secondary assays that use carbon starvation as the in vitro model. Together these assays identify compounds with activity against replicating and nonreplicating M. tuberculosis as well as compounds that inhibit the transition from nonreplicating to replicating stages of growth. Using these assays we successfully screened over 300,000 compounds and identified 786 inhibitors of nonreplicating M. tuberculosis In order to understand the relationship among different nonreplicating models, we tested 52 of these molecules in a hypoxia model, and four different chemical scaffolds in a stochastic persister model, and a streptomycin-dependent model. We found that compounds display varying levels of activity in different models for the nonreplicating state, suggesting important differences in bacterial physiology between models. Therefore, chemical tools identified in this assay may be useful for determining the relevance of different nonreplicating in vitro models to in vivo M. tuberculosis infection. Given our current limited understanding, molecules that are active across multiple models may represent more promising candidates for further development.
authors.affiliation: Broad Institute of MIT and Harvard , Cambridge, Massachusetts 02142, United States.
authors.forename: Sarah Schmidt
authors.initials: SS
authors.lastname: Grant
authors.forename: Tomohiko
authors.initials: T
authors.lastname: Kawate
authors.forename: Partha P
authors.initials: PP
authors.lastname: Nag
authors.forename: Melanie R
authors.initials: MR
authors.lastname: Silvis
authors.forename: Katherine
authors.initials: K
authors.lastname: Gordon
authors.forename: Sarah A
authors.initials: SA
authors.lastname: Stanley
authors.forename: Edward
authors.initials: E
authors.lastname: Kazyanskaya
authors.forename: Raymond
authors.initials: R
authors.lastname: Nietupski
authors.forename: Aaron
authors.initials: A
authors.lastname: Golas
authors.forename: Michael
authors.initials: M
authors.lastname: Fitzgerald
authors.forename: Sanghyun
authors.initials: S
authors.lastname: Cho
authors.forename: Scott G
authors.initials: SG
authors.lastname: Franzblau
authors.forename: Deborah T
authors.initials: DT
authors.lastname: Hung
mesh_terms: D000995:Antitubercular Agents / Q000737:chemistry / Q000494:pharmacology*; D002244:Carbon / Q000378:metabolism*; D002453:Cell Cycle / Q000187:drug effects; D005502:Food; D008826:Microbial Sensitivity Tests; D008954:Models, Biological; D015394:Molecular Structure; D009169:Mycobacterium tuberculosis / Q000166:cytology / Q000187:drug effects*; D054852:Small Molecule Libraries / Q000737:chemistry / Q000494:pharmacology
chemical_list: D000995:Antitubercular Agents; D054852:Small Molecule Libraries; D002244:Carbon
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