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. 1987 Feb;55(2):446–450. doi: 10.1128/iai.55.2.446-450.1987

Mycobacterium leprae-burdened macrophages are refractory to activation by gamma interferon.

L D Sibley, J L Krahenbuhl
PMCID: PMC260348  PMID: 3100449

Abstract

Mycobacterium leprae grows to enormous numbers in the nu/nu mouse footpad, producing granulomas resembling those of lepromatous leprosy in humans. Footpad granuloma cells gorged with M. leprae were established in primary cell culture to examine their functional capabilities. These cells were classified as macrophages by the following criteria: positive staining for nonspecific esterase, reduction of Nitro Blue Tetrazolium during phagocytosis of Candida albicans, possession of Fc receptors, and possession of Mac-1 antigen. Footpad macrophages also phagocytized and supported the intracellular growth of Toxoplasma gondii. However, unlike peritoneal macrophages, footpad macrophages could not be activated to kill or inhibit T. gondii by macrophage-activating factor produced by mitogen-stimulated spleen cells or by recombinant gamma interferon. Thus, although the lepromatous macrophages appeared to be normal in many of their functions, they were defective in response to macrophage-activating signals.

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Selected References

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