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ATP up-regulates macrophage antimycobacterial activity in a P2X 7 -dependent manner, but little is known about whether ATP directly exhibits antimicrobial effects against intracellular mycobacteria. In this study, we found that ATP inhibited the growth of various bacteria, including  Staphylococcus ,  Pseudomonas , and mycobacteria, without damaging bacterial surface structures. Using gene technology, we newly established an enterobactin-deficient ( entB  − ) mutant from ATP-resistant  Klebsiella pneumoniae , and found the recovery of ATP susceptibility in the enterobactin-deleted mutant. Therefore, ATP's antibacterial activity is attributable to its iron-chelating ability. Since ATP distributed in the cytosol of macrophages at high concentrations, ATP appears to augment macrophage's antimicrobial activity by directly attacking intracytosolic and intra-autophagosomal pathogens. Furthermore, ATP exhibited combined effects with some antimicrobials against methicillin-resistant  S. aureus  (MRSA) and  M. intracellulare , suggesting its usefulness as an adjunctive drug in the chemotherapy of certain intractable infections.

ATP Exhibits Antimicrobial Action by Inhibiting Bacterial Utilization of Ferric Ions