Browsing by Author "Cho, Sanghyun"

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Imidazo[1,2-a]Pyridine-3-Carboxamides Are Active Antimicrobial Agents against Mycobacterium avium Infection In Vivo
(2016-08) Moraski, Garrett C.; Cheng, Yong; Cho, Sanghyun; Cramer, Jeffrey W; Godfrey, Alexander; Masquelin, Thierry; Franzblau, Scott G.; Miller, Marvin J.; Schorey, Jeffery
A panel of six imidazo[1,2-a]pyridine-3-carboxamides (IAPs) were shown to have low-micromolar activity against Mycobacterium avium strains. Compound ND-10885 (compound 2) showed significant activity in the lung, spleen, and liver in a mouse M. avium infection model. A combined regimen consisting of ND-10885 (compound 2) and rifampin was additive in its anti-M. avium activity in the lung. Our data indicate that IAPs represent a new class of antibiotics that are active against M. avium and could potentially serve as an effective addition to a combined treatment regimen.
Putting Tuberculosis (TB) To Rest: Transformation of the Sleep Aid, Ambien, and “Anagrams” Generated Potent Antituberculosis Agents
(2014-12) Moraski, Garrett C.; Miller, Patricia; Bailey, Mai Ann; Ollinger, Juliane; Parish, Tanya; Boshoff, Helena I.; Cho, Sanghyun; Anderson, Jeffery; Mulugeta, Surafel; Franzblau, Scott G.; Miller, Marvin J.
Zolpidem (Ambien, 1) is an imidazo[1,2-a]pyridine-3-acetamide and an approved drug for the treatment of insomnia. As medicinal chemists enamored by how structure imparts biological function, we found it to have strikingly similar structure to the antitubercular imidazo[1,2-a]pyridine-3-carboxyamides. Zolpidem was found to have antituberculosis activity (MIC of 10–50 μM) when screened against replicating Mycobacterium tuberculosis (Mtb) H37Rv. Manipulation of the Zolpidem structure, notably, to structural isomers (“anagrams”), attains remarkably improved potency (5, MIC of 0.004 μM) and impressive potency against clinically relevant drug-sensitive, multi- and extensively drug-resistant Mtb strains (MIC < 0.03 μM). Zolpidem anagrams and analogues were synthesized and evaluated for their antitubercular potency, toxicity, and spectrum of activity against nontubercular mycobacteria and Gram-positive and Gram-negative bacteria. These efforts toward the rational design of isomeric anagrams of a well-known sleep aid underscore the possibility that further optimization of the imidazo[1,2-a]pyridine core may well “put TB to rest”.