OBJECTIVETo evaluate the free radical generation and antioxidant enzymes status in murine peritoneal macrophage during in vitro amikacin resistant Pseudomonas aeruginosa (ARPA) treatment with different time interval.

METHODSPeritoneal macrophages were treated with 1×10(8) CFU/mL ARPA cell suspension in vitro for different time interval (1, 2, 3, 6, 12, and 24 h) and super oxide anion generation, NO generation, reduced glutathione level and antioxidant enzymes status were analyzed.

RESULTSSuper oxide anion generation and NO generation got peak at 12 h, indicating maximal free radical generation through activation of NADPH oxidase in murine peritoneal macrophages during ARPA transfection. Reduced glutathione level and antioxidant enzymes status were decreased significantly (P<0.05) with increasing time of ARPA transfection. All the changes in peritoneal macrophages after 12 h in vitro ARPA transfection had significant difference (P<0.05).

CONCLUSIONSFrom this study, it may be summarized that in vitro ARPA infection not only generates excess free radical but also affects the antioxidant system and glutathione cycle in murine peritoneal macrophage.

Amikacin ; pharmacology ; Animals ; Anti-Bacterial Agents ; pharmacology ; Antioxidants ; analysis ; Cells, Cultured ; Drug Resistance, Bacterial ; Free Radicals ; analysis ; Glutathione ; analysis ; Macrophages, Peritoneal ; immunology ; microbiology ; physiology ; Male ; Mice ; Oxidative Stress ; Pseudomonas aeruginosa ; growth & development ; immunology ; Time Factors