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The Journal of Immunology, Vol 150, Issue 12 5529-5534, Copyright © 1993 by American Association of Immunologists
ARTICLES |
SM Thomas, LF Garrity, CR Brandt, CS Schobert, GS Feng, MW Taylor, JM Carlin and GI Byrne
Department of Medical Microbiology, University of Wisconsin-Madison Medical School 53706.
The role of indoleamine 2,3-dioxygenase (IDO) in IFN-gamma-mediated inhibition of intracellular parasite growth has been examined previously, although earlier work has been largely correlative. In this study, we defined more completely the role of IDO in the IFN- antimicrobial response. Two mutant cell lines, derived from ME180 cells and exhibiting reduced IDO activity (IR3B6A, IR3B6B) were characterized to determine if they retained the capacity to inhibit intracellular Chlamydia and Toxoplasma growth. Mutant cells treated with IFN-gamma exhibited reduced capacity to suppress pathogen growth. The expression of several IFN-regulated genes also was measured to confirm that the inability to inhibit pathogen growth was because of the lack of IDO. The expression of class II MHC, intracellular adhesion molecule-1, MxA, and P68 kinase genes was induced in the IFN-gamma-treated wild type ME180 cells, but was variable in the mutant cell lines, supporting the hypothesis that IFN-gamma-induced production of IDO is a key IFN-gamma- mediated antimicrobial mechanism.
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