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The Journal of Immunology, Vol 156, Issue 2 450-458, Copyright © 1996 by American Association of Immunologists
ARTICLES |
E Carrasco-Marin, J Shimizu, O Kanagawa and ER Unanue
Center for Immunology, Washington University School of Medicine, St. Louis, MO 63110, USA.
The class II molecules of the diabetes-prone NOD mice, I-Ag7, showed very limited amounts of stable form when analyzed by SDS-PAGE. We included the analysis of spleen B cells and B lymphoma cells transfected with I-Ag7 genes. Early during bio-synthesis there was invariant chain binding to the alpha beta-chains. Examination of APCs from F1 mice (NOD x C57BL/6) indicated that the same APC expressed high levels of unstable I-Ag7 and normal amounts of stable class II molecules compared with the other haplotype (I-Ab). The half-life of I- Ag7-peptide complexes on the cell surface of APC was significantly shorter than that of other class II haplotypes. Direct biochemical demonstration of peptide interactions with I-Ag7 was difficult to demonstrate. In T cell assays, the immunogenic peptides, including the diabetogenic Ag, were rapidly lost when peptide-pulsed APCs were washed free of peptide. We hypothesize that the weak and unstable peptide- binding property of I-Ag7 molecules does not favor the elimination or inactivation of autoreactive T cells.
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