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Infect Immun. 1993 July; 61(7): 2763-2773

Pathogenesis of tuberculosis: interaction of Mycobacterium tuberculosis with macrophages.

K A McDonough, Y Kress and B R Bloom

Howard Hughes Medical Institute, Bronx, New York 10461.

ABSTRACT

Central to understanding the pathogenesis of tuberculosis is the interaction between the pathogen and mononuclear phagocytes. A key question about that interaction is whether Mycobacterium tuberculosis exerts an effect on phagolysosome fusion. We have reexamined the dynamics of phagolysosome fusion and its effect on intracellular bacterial replication in M. tuberculosis-infected macrophages by performing an extensive study at the electron microscopic level. Thoria-labelled murine and human macrophages were infected with a virulent (H37Rv) or avirulent (H37Ra) strain of M. tuberculosis or with Mycobacterium bovis BCG vaccine for times ranging from 2 h to 7 days. In all cases, by 2 h postinfection, approximately 85% of the bacteria clearly resided in fused vacuoles. However, at 4 days postinfection, fusion levels for viable H37Rv and H37Ra were reduced by half, whereas the fusion profiles of BCG and of heat-killed H37Rv and H37Ra were unchanged. A comparison of the numbers of bacteria per fused and nonfused vacuoles suggests both a net transfer of bacteria out of fused vacuoles and preferential bacterial multiplication in nonfused vacuoles. H37Rv and H37Ra appeared to bud from the phagolysosomes into tightly apposed membrane vesicles that did not fuse with secondary lysosomes. In some cases, no such membrane was seen and the bacteria appeared to be free in the cytoplasm. Only viable H37Rv showed a significant increase in bacterial counts during the course of infection. Thus, both of the attenuated strains we examined differed from the virulent strain H37Rv in their abilities to replicate successfully within macrophages, but each diverged from H37Rv at a different point in the process. Viable tubercle bacilli H37Rv and H37Ra had the capacity to escape from fused vesicles as the infection progressed; BCG did not. After extrusion from the phagolysosome, H37Rv, but not H37Ra, was able to multiply. These results suggest a novel mechanism by which virulent M. tuberculosis eludes the microbicidal mechanisms of macrophages by escaping from fused phagolysosomes into nonfused vesicles or the cytoplasm.

Infect Immun. 1993 July; 61(7): 2763-2773




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