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The Journal of Immunology, Vol 158, Issue 9 4260-4269, Copyright © 1997 by American Association of Immunologists
ARTICLES |
M Hobart, V Ramassar, N Goes, J Urmson and PF Halloran
Department of Medicine, University of Alberta, Edmonton, Canada.
Transcription factor interferon regulatory factor-1 (IRF-1) is implicated in regulating class I MHC expression in vitro. We investigated the in vivo relationship between IRF-1 and MHC expression in kidney and other nonlymphoid organs, assessing MHC expression in mice with disrupted IRF-1 genes (IRF-1 KO) compared with mice with intact IRF-1 genes (WT). In kidneys of IRF-1 KO mice, basal class I expression was decreased, particularly on arterial endothelium, but basal class II expression was unchanged. The induction of both class I and class II expression by injected rIFN-gamma was reduced in IRF-1 KOs, compared with WT mice. Similarly, stimuli that induce endogenous IFN-gamma production (LPS or oxazolone) massively increased MHC expression in kidneys of WT mice, with little increase in IRF-1 KO mice. Impaired class II induction by rIFN-gamma in IRF-1 KO mice probably reflects the role of IRF-1 in regulating class II transactivator (CIITA) expression: rIFN-gamma induced CIITA mRNA less in kidneys of IRF-1 KO mice than in WT mice. In organs of WT mice, IRF- 1 mRNA was expressed in the basal state, and rIFN-gamma treatment increased IRF-1 mRNA before the induction of class I or CIITA mRNA. Treatment of WT mice with cycloheximide plus rIFN-gamma superinduced IRF-1 mRNA expression, but partially inhibited CIITA mRNA expression, indicating that IRF-1 mRNA induction is not dependent on new protein synthesis, unlike CIITA. Thus, in vivo, IRF-1 plays a major role in basal and induced class I expression and in induction of class II by IFN-gamma, probably via CIITA induction.
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