Intracellular and in vivo evaluation of imidazo[2,1-b]thiazole-5-carboxamide anti-tuberculosis compounds
作者:Garrett C. Moraski、Nathalie Deboosère、Kate L. Marshall、Heath A. Weaver、Alexandre Vandeputte、Courtney Hastings、Lisa Woolhiser、Anne J. Lenaerts、Priscille Brodin、Marvin J. Miller
DOI:10.1371/journal.pone.0227224
日期:——
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.
咪唑并[2,1-b]噻唑-5-羧酰胺(ITA)是一类有前景的抗结核药物,在体外显示出强效活性,并靶向QcrB,这是结核分枝杆菌细胞色素bcc-aa3超复合物的一个关键组成部分,对于电子传递链至关重要。在此,我们报告了九种不同ITA类化合物在细胞内巨噬细胞中的效能,最低抑菌浓度(MIC)值范围为0.0625–2.5μM,单药耐药效能范围为0.0017至7μM。我们确定了该系列突出化合物ND-11543的体外ADME特性(蛋白结合、CaCo-2、人体微粒体稳定性和CYP450抑制)。ND-11543在小鼠中耐受剂量超过500 mg/kg,在200 mg/kg剂量下显示出良好的药物暴露,AUC(0-24h)超过11,700 ng·hr/mL,半衰期超过24小时。与其他QcrB抑制剂观察到的表型一致,化合物ND-11543在慢性小鼠结核感染模型中显示出疗效,剂量为200 mg/kg,持续4周。疗效不依赖于暴露,因为预处理已知的CYP450抑制剂并未显著改善疗效。ITA为新型抗结核药物的发展提供了一个有趣的骨架,特别是在基于其有利特性和新颖作用机制的联合治疗中。