Salicylanilide pyrazinoates inhibit in vitro multidrug-resistant Mycobacterium tuberculosis strains, atypical mycobacteria and isocitrate lyase

The development of antimicrobial agents represents an up-to-date topic. This study investigated in vitro antimycobacterial activity, mycobacterial isocitrate lyase inhibition and cytotoxicity of salicylanilide pyrazinoates. They may be considered being mutual prodrugs of both antimycobacterial active salicylanilides and pyrazinoic acid (POA), an active metabolite of pyrazinamide, in which these esters are likely hydrolysed without presence of pyrazinamidase/nicotinamidase. Minimum inhibitory concentrations (MICs) of the esters were within the range 0.5-8 mu mol/l for Mycobacterium tuberculosis and 1-32 mu mol/l for nontuberculous mycobacteria (Mycobacterium avium, Mycobacterium kansasii). All esters showed a weak inhibition (8-17%) of isocitrate lyase at the concentration of 10 mu mol/l. The most active pyrazinoates showed MICs for multidrug-resistant tuberculosis strains in the range of 0.125-2 mu mol/l and no cross-resistance with clinically used drugs, thus being the most in vitro efficacious salicylanilide esters with 4-chloro-2{[4-(trifluoromethyl)phenyl]carbamoyl}phenyl pyrazine-2-carboxylate superiority (MICs <= 0.25 mu mol/l). This promising activity is likely due to an additive or synergistic effect of released POA and salicylanilides. Selectivity indexes for the most active salicylanilide pyrazinoates ranged up to 64, making some derivatives being attractive candidates for the next research; 4-bromo-2{[4-(trifluoromethyl)phenyl]carbamoyl}phenyl pyrazine-2-carboxylate showed the most convenient toxicity profile. (C) 2013 Elsevier B.V. All rights reserved.