International Immunology, Vol. 11, No. 12, 1981-1988,
December 1999
© 1999 Japanese Society for Immunology
Allelic variations in rat MHC class II binding of myelin basic protein peptides correlate with encephalitogenicity
1 Neuroimmunology Unit, Center of Molecular Medicine L8:04, Karolinska Hospital, 17176 Stockholm, Sweden
2 Department of Neurology, University of Tübingen, 72076 Tübingen, Germany
3 Department of Cellular and Molecular Biology, Section for Medical Inflammation Research, Lund University, 22100 Lund, Sweden
Correspondence to: K. L. de Graaf, Department of Neurology, Auf der Morgenstelle 15, University of Tübingen, 72076 Tübingen, Germany
The impact of the strength and promiscuity of the self peptideMHC class II interaction on susceptibility to autoimmune disease is uncertain. Here we studied allelic differences in the affinity of rat MHC class II molecules for myelin basic protein (MBP) peptides spanning from position 63 to 106. Predominantly peptides from this region are immunogenic in the rat and the MHC class II region determines if the response is disease promoting or disease protective. Strikingly, RT1.B (DQ-like) molecules showed much more allelic variation of MBP peptide binding than RT1.D (DR-like) molecules. Moderate to strong binding of particular MBP peptides correlated with their previously documented encephalitogenicity. Moreover, the differences in disease susceptibility to certain MBP peptides observed in the different rat strains were clearly reflected in the allelic diversity of the peptide binding profiles. In conclusion our findings demonstrate that disease-inducing stretches of MBP generally comprise good binding peptides.
Keywords: antigen, antigen binding, epitope, experimental autoimmune encephalomyelitis, MHC, multiple sclerosis, peptide, rodent
Transmitting editor: L. Steinman
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