TB drug development: immunology at the table.

TitleTB drug development: immunology at the table.
Publication TypeJournal Article
Year of Publication2015
AuthorsNathan C, Barry CE
JournalImmunol Rev
Date Published2015 Mar
KeywordsAnimals, Antitubercular Agents, Drug Discovery, Drug Resistance, Bacterial, Host-Pathogen Interactions, Humans, Mycobacterium tuberculosis, Tuberculosis

Our understanding of the host-pathogen relationship in tuberculosis (TB) can help guide drug discovery in at least two ways. First, the recognition that host immunopathology affects lesional TB drug distribution means that pharmacokinetic evaluation of drug candidates needs to move beyond measurements of drug levels in blood, whole lungs, or alveolar epithelial lining fluid to include measurements in specific types of lesions. Second, by restricting the replication of M. tuberculosis (Mtb) subpopulations in latent TB infection and in active disease, the host immune response puts Mtb into a state associated with phenotypic tolerance to TB drugs selected for their activity against replicating Mtb. This has spurred a major effort to conduct high throughput screens in vitro for compounds that can kill Mtb when it is replicating slowly if at all. Each condition used in vitro to slow Mtb's replication and thereby model the phenotypically drug-tolerant state has advantages and disadvantages. Lead candidates emerging from such in vitro studies face daunting challenges in the design of proof-of-concept studies in animal models. Moreover, some non-replicating subpopulations of Mtb fail to resume replication when plated on agar, although their viability is demonstrable by other means. There is as yet no widely replicated assay in which to screen compounds for their ability to kill this 'viable but non-culturable' subpopulation. Despite these hurdles, drugs that can kill slowly replicating or non-replicating Mtb may offer our best hope for treatment-shortening combination chemotherapy of TB.

Alternate JournalImmunol. Rev.
PubMed ID25703568
PubMed Central IDPMC4339218
Grant ListR01 AI64768 / AI / NIAID NIH HHS / United States
U19 AI111143 / AI / NIAID NIH HHS / United States
R01 AI105807 / AI / NIAID NIH HHS / United States
R01 AI064768 / AI / NIAID NIH HHS / United States
R33 AI105807 / AI / NIAID NIH HHS / United States
R21 AI105807 / AI / NIAID NIH HHS / United States

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