Intracellular and in vivo evaluation of imidazo[2,1-b]thiazole-5-carboxamide anti-tuberculosis compounds

Autoři: Garrett C. Moraski aff001;  Nathalie Deboosère aff002;  Kate L. Marshall aff001;  Heath A. Weaver aff001;  Alexandre Vandeputte aff002;  Courtney Hastings aff003;  Lisa Woolhiser aff003;  Anne J. Lenaerts aff003;  Priscille Brodin aff002;  Marvin J. Miller aff004
Působiště autorů: Department of Chemistry and Biochemistry, Montana State University, Bozeman, Montana, United States of America aff001;  Univ. Lille, CNRS, Inserm, CHU Lille, Institut Pasteur de Lille, U1019 –UMR 8204 –CIIL–Center for Infection and Immunity of Lille, Lille, France aff002;  Mycobacteria Research Laboratories, Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, Colorado, United States of America aff003;  Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana, United States of America aff004
Vyšlo v časopise: PLoS ONE 15(1)
Kategorie: Research Article


The imidazo[2,1-b]thiazole-5-carboxamides (ITAs) are a promising class of anti-tuberculosis agents shown to have potent activity in vitro and to target QcrB, a key component of the mycobacterial cytochrome bcc-aa3 super complex critical for the electron transport chain. Herein we report the intracellular macrophage potency of nine diverse ITA analogs with MIC values ranging from 0.0625–2.5 μM and mono-drug resistant potency ranging from 0.0017 to 7 μM. The in vitro ADME properties (protein binding, CaCo-2, human microsomal stability and CYP450 inhibition) were determined for an outstanding compound of the series, ND-11543. ND-11543 was tolerable at >500 mg/kg in mice and at a dose of 200 mg/kg displayed good drug exposure in mice with an AUC(0-24h) >11,700 ng·hr/mL and a >24 hr half-life. Consistent with the phenotype observed with other QcrB inhibitors, compound ND-11543 showed efficacy in a chronic murine TB infection model when dosed at 200 mg/kg for 4 weeks. The efficacy was not dependent upon exposure, as pre-treatment with a known CYP450-inhibitor did not substantially improve efficacy. The ITAs are an interesting scaffold for the development of new anti-TB drugs especially in combination therapy based on their favorable properties and novel mechanism of action.

Klíčová slova:

Tuberculosis – Mycobacterium tuberculosis – Blood plasma – Spleen – Mouse models – High performance liquid chromatography – Macrophages – Animal models of infection


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