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. 1996 Nov;40(11):2545–2549. doi: 10.1128/aac.40.11.2545

Enhanced intramacrophage activity of resorcinomycin A against Mycobacterium avium-Mycobacterium intracellulare complex after liposome encapsulation.

R Gomez-Flores 1, R Hsia 1, R Tamez-Guerra 1, R T Mehta 1
PMCID: PMC163572  PMID: 8913461

Abstract

The activities of free and liposomal resorcinomycin A against Mycobacterium avium-Mycobacterium intracellulare complex (MAC) grown in broth and in murine peritoneal macrophages were evaluated. Liposomal resorcinomycin A was composed of dimyristoyl phosphatidylcholine and phosphatidylinositol at a molar ratio of 9:1. Both free resorcinomycin A and liposomal resorcinomycin A showed no toxicity to macrophages at concentrations up to 50 micrograms/ml, as determined by the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) reduction assay. Minimal inhibitory concentrations of free resorcinomycin A and liposomal resorcinomycin A in broth were 6 and 12 micrograms/ml, respectively, as determined by the MTT colorimetric microassay. In macrophages, liposomal resorcinomycin A caused significantly higher intramacrophage antimycobacterial activity than the free form of the drug. At doses ranging from 6 to 50 micrograms/ml, liposomal resorcinomycin A caused 50 to 93% MAC growth inhibition, respectively (as determined by CFU), while free resorcinomycin A was associated with 33 to 62% MAC growth inhibition, respectively, 3 days after drug treatment. In addition, antimycobacterial activity of liposomal resorcinomycin A in macrophages was maintained 7 days after treatment, whereas the activity of free resorcinomycin A was reduced to negligible 3 days after treatment. In summary, liposome encapsulation of resorcinomycin A resulted in significant enhancement of antibacterial activity against intramacrophagic MAC infection.

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Selected References

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