u-100480 and Hypoxia

The activities of rifampin, nitazoxanide, PA-824, and sutezolid were tested against dormant

Topics: Antitubercular Agents; Drug Combinations; Drug Therapy, Combination; Ethambutol; Humans; Hydrogen-Ion Concentration; Hypoxia; Isoniazid; Microbial Sensitivity Tests; Mycobacterium tuberculosis; Nitroimidazoles; Oxazolidinones; Pyrazinamide; Rifampin; Tuberculosis

Oxazolidinones represent a new class of antituberculosis drugs that exert their function by inhibiting protein synthesis. Here, we compared the activities of three oxazolidinones, linezolid, PNU-100480, and AZD5847, against latent tuberculosis using a simple model employing the streptomycin-starved Mycobacterium tuberculosis strain 18b. The in vitro drug susceptibility results showed that the three oxazolidinones had a bacteriostatic effect against actively growing bacilli but potent bactericidal activity against nonreplicating cells. In the murine model of latent infection with M. tuberculosis 18b, the efficacy of the three compounds varied greatly. Indeed, AZD5847 or its prodrug exhibited no activity or only modest activity, respectively, after 2 months of treatment, whereas both linezolid and PNU-100480 were effective against latent bacilli in mice and showed promising outcomes in combination therapy with rifampin. Moreover, the potency of PNU-100480 was significantly greater than that of linezolid, making it an attractive drug candidate in the development of new combination therapies for latent tuberculosis.

Topics: Acetamides; Animals; Antitubercular Agents; Cells, Cultured; Colony Count, Microbial; Female; Hypoxia; Latent Tuberculosis; Linezolid; Mice; Mice, Inbred BALB C; Microbial Sensitivity Tests; Mycobacterium tuberculosis; Oxazolidinones