Symposium: Autoimmune Arthritis
Collagen-Induced Arthritis Mediated by HLA-DR1 (*0101) and HLA-DR4 (*0401)

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ABSTRACT

Although associations between the expression of particular HLA genes and susceptibility to specific autoimmune diseases has been known for some time, the role HLA molecules play in the autoimmune response is unclear. Through the establishment of chimeric HLA-DR/I-E transgenes, the authors examined the function of the rheumatoid arthritis (RA) susceptibility alleles HLA-DR1 (DRB1*0101) and DR4 (DRB1*0401) in presenting antigenic peptides derived from the model antigen, type II collagen (CII), and in mediating an autoimmune response. As a transgene, these chimeric DR molecules confer susceptibility to an autoimmune arthritis induced by immunization with human CII. Both the DR1 and DR4-restricted T cell responses to CII are focused on an immunodominant determinant CII(263–270). Peptide binding studies revealed that the majority of the CII-peptide binding affinity for DR1 and DR4 is controlled by the Phe at 263 and, unexpectedly, the adjacent Lys. Only these 2 CII amino acids were found to provide binding anchors. Amino acid substitutions at the remaining positions had either no effect or significantly increased the affinity of the hCII peptide. These data indicate that DR1 and DR4 bind this CII peptide in a nearly identical manner and that the primary structure of CII may dictate a different binding motif for DR1 and DR4 than has been described for other peptides. In all, these studies demonstrate that DR1 and DR4 are capable of binding peptides derived from human type II collagen (hCII) and support the hypothesis that autoimmune responses to hCII play a role in the pathogenesis of RA.

Section snippets

HLA-DR Transgenic Mice as Models for the Study of Autoimmune Diseases

The primary purpose of these studies was to determine the relationship between the RA susceptibility alleles, DR1 and DR4, and the autoimmunity to CII observed in RA patients. To study the function of these class II alleles, chimeric HLA-DR1 (DRB1*0101) and -DR4 (DRB1*0401) molecules were constructed and established as transgenes in the B10.M mouse strain.25., 26., 27. The chimeric DR molecules were constructed by replacing the second, transmembrane, and cytoplasmic domains with the

Discussion

The development of HLA transgenic mouse models has proven to be an effective approach to studying the function of the HLA molecules associated with autoimmunity. A number of HLA transgenic models of autoimmunity have now been developed, including ankylosing spondylitis,35., 36. EAE,37 and diabetes,38 that have enabled studies of the relationship between class I or class II HLA molecules and autoimmunity. In addition, these models have also made it possible to study the presentation of potential

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    This work was supported in part by grants from the Department of Veterans Affairs, Memphis, Tennessee, and by US Public Health Service Grants AR-47379 (AHK) and AR-39169 (AHK) from the National Institute for Arthritis and Musculoskeletal Diseases.

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