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lüll The role of macrophage cell death in tuberculosis Kornfeld H; Mancino G; Colizzi VCell Death Differ 1999[Jan]; 6 (1): 71-8Studies of host responses to infection have traditionally focused on the direct antimicrobial activity of effector molecules (antibodies, complement, defensins, reactive oxygen and nitrogen intermediates) and immunocytes (macrophages, lymphocytes, and neutrophils among others). The discovery of the systems for programmed cell death of eukaryotic cells has revealed a unique role for this process in the complex interplay between microorganisms and their cellular targets or responding immunocytes. In particular, cells of the monocyte/macrophage lineage have been demonstrated to undergo apoptosis following intracellular infection with certain pathogens that are otherwise capable of surviving within the hostile environment of the phagosome or which can escape the phagosome. Mycobacterium tuberculosis is a prototypical 'intracellular parasite' of macrophages, and the direct induction of macrophage apoptosis by this organism has recently been reported from several laboratories. This paper reviews the current understanding of the mechanism and regulation of macrophage apoptosis in response to M. tuberculosis and examines the role this process plays in protective immunity and microbial virulence.|*Apoptosis[MESH]|Animals[MESH]|Autocrine Communication/immunology[MESH]|Humans[MESH]|Immunity/immunology[MESH]|Lymphocytes/immunology[MESH]|Macrophages/immunology/*microbiology[MESH]|Mycobacterium tuberculosis/*pathogenicity[MESH]|Paracrine Communication/immunology[MESH]|Signal Transduction/immunology[MESH] |