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The Journal of Immunology, Vol 140, Issue 9 3006-3013, Copyright © 1988 by American Association of Immunologists
ARTICLES |
LE Bermudez and LS Young
Kuzell Institute for Arthritis and Infectious Diseases, Medical Research Institute at Pacific Presbyterian Medical Center, San Francisco, CA 94115.
Organisms belonging to the Mycobacterium avium complex (MAC) are the most common bacterial pathogens in patients with AIDS but factors associated with the activation of cellular defense mechanisms against this atypical mycobacterium have not been defined. Peritoneal macrophages harvested from a chronic MAC infection in C57 black mice are able to kill approximately 86% of intracellular MAC in contrast to 0 to 20% killing by unstimulated human and mouse macrophages in vitro. The availability of human rTNF-alpha, rIFN-gamma, and rIL-2 permitted evaluation of the role of each of these lymphokines/monokines, alone or in combination, in activating macrophages in vitro to kill MAC. Human monocyte-derived macrophages were cultured in vitro, stimulated with rIL-2, rIFN-gamma, or rTNF, and then infected with MAC (serovars 1 and 8). Mouse peritoneal macrophages were harvested, cultured in vitro, and stimulated with rIFN-gamma. rTNF (10(4) U/ml) was associated with a modest increase of intracellular killing of MAC (58 +/- 5%) even when utilized 24 or 48 h after macrophage infection or when administered for 5 consecutive days after infection (78.1 +/- 4%). Both human and murine IFN-gamma were associated with increased intracellular growth of MAC (32 +/- 4% for murine and 38 +/- 3% for human macrophages). However, intracellular killing (53 +/- 6% compared with control) was observed after 6 days of treatment with IFN-gamma. This latter effect was fully blocked by anti-TNF antibody, whereas rIL-2 alone did not augment the intracellular killing of MAC by human macrophages. rTNF plus either rIFN-gamma or rIL-2 triggered significant increases in superoxide anion production, but subsequent MAC killing was no greater than with rTNF alone. Treatment of macrophages with 10 U/ml of rTNF followed by rIL-2 (200 U/ml) was associated with 68% of intracellular killing. TNF seems to be an important monokine, promoting activation of mycobactericidal mechanisms in human macrophages.
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