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Efficacy of liposome-encapsulated amikacin and free amikacin against Mycobacterium avium complex was evaluated in the beige mouse (C57BL/6J-bgJ/bgJ) acute infection model. Approximately 10(7) viable M. avium complex serotype 1 cells for which the MIC of amikacin was 8 micrograms/ml were given intravenously. Treatment was started with encapsulated or free amikacin at approximately 110 or 40 mg/kg of body weight 7 or 14 days later. In the former experiment, treatment was given two or three times per week. In the latter experiment, treatment was given daily for 5 days. The animals were sacrificed 5 days after the last dose. Liver, spleen, and lung were homogenized, and viable cell counts were determined on 7H10 agar. An analysis of variance and subsequent Tukey HSD (honestly significant difference) tests indicated that both encapsulated and free amikacin significantly reduced viable cell counts in each of the organs compared with counts in the control group. Compared with free amikacin, encapsulated amikacin significantly reduced viable cell counts in the liver and spleen. Liposome encapsulation of an active agent appears to be a promising therapeutic approach to M. avium complex infection.

Liposome-encapsulated-amikacin therapy of Mycobacterium avium complex infection in beige mice