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The multilamellar lecithin-cholesterol liposomes entrapping carboxyfluorescence as a specific marker were prepared to be incubated with mycobacteria. The extent of resulting liposomal lysis was measured by marker release. Mycobacteria were highly active in this respect regardless of the species. Staphylococci were much less active and E. coli was completely inactive. Molecular species of lecithin and their ratio to cholesterol were related with the liposome sensitivity to mycobacteria. Ultrastructural and biochemical study showed that liposomes can be in close contact with mycobacteria and lecithins are degraded so that released fatty acids are incorporated into bacterial lipids, especially in virulent species. Liposomes-mycobacteria interaction was discussed as a partial model of the phagocyte-parasite interaction at the membrane level.

LIPOSOMES-MYCOBACTERIA INCUBATION SYSTEMS AS A PARTIAL MODEL OF HOST-PARASITE INTERACTION AT CELL MEMBRANE LEVEL