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Spontaneous Inflammatory Disease in HLA-B27 Transgenic Mice Is Independent of MHC Class II Molecules: A Direct Role for B27 Heavy Chains and Not B27-Derived Peptides¹

Sanjay D. Khare^*, Michael J. Bull^*, Julie Hanson^*, Harvinder S. Luthra and Chella S. David^2,*

Departments of ^* Immunology and Rheumatology, Mayo Clinic and Medical School, Rochester, MN 55905

Although association of HLA-B27 with human spondyloarthropathies has been known for several years, its role in disease pathogenesis is not understood. Recently, a few investigators have proposed that presentation of B27-derived peptides by MHC class II molecules may be the underlying mechanism. HLA-B27 transgenic rat and mouse models have provided a new tool for understanding the exact role of B27 in disease pathogenesis. HLA-B27 mice lacking endogenous ß₂-microglobulin (B27⁺ß₂m^o) develop disease after they are transferred from the barrier facility to the conventional colony. This model was utilized to test the hypothesis that B27-derived peptide presented by MHC class II molecules is the cause of the disease. The MHC class II knockout gene, Aß^o, was bred into our B27⁺ß₂m^o mice, and disease manifestation was monitored. These mice develop spontaneous disease, demonstrating that MHC class II molecules do not play a major role in B27-related disease. Thus, the disease is not manifested by presentation of B27-derived peptides by class II molecules, since these mice are devoid of H2-A and H2-E molecules. Furthermore, in vivo treatment with mAb against the heavy chain of B27 reduced the incidence of disease in B27⁺ß₂m^o mice. Our results clearly demonstrate that B27 heavy chains are directly involved in the disease process.

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