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Departments of
*
Immunology and
Rheumatology, Mayo Clinic and Medical School, Rochester, MN 55905; and
Research Service, Veterans Affairs Medical Center, and Department of Medicine, Division of Rheumatology, University of Utah, Salt Lake City, UT 84132
We have generated transgenic (tg) mice expressing HLA-DQ8
ß
(DQA1*0301/DQB*0302) or HLA-DQ6
ß
(DQA1*0103/DQB1*0601) molecules lacking endogenous
murine class II expression (Aß0) to investigate the ability of these
HLA class II to present type II collagen (CII) and induce
collagen-induced arthritis. The DQ8
ß tg mice responded strongly to
CII, developing severe arthritis, while DQ6
ß tg mice were
nonresponsive to CII. The addition of the mixed haplotype DQ8
6ß
molecule did not significantly influence CII reactivity. To examine the
interaction of DQ6
ß and DQ8
ß molecules in vivo, we generated
double tg DQ6
ß/8
ß (Aß0) mice expressing both the
- and
ß-chains of DQ6 and DQ8 molecules by mating DQ6
ß (Aß0) and
DQ8
ß (Aß0) tg mice. CII-immunized DQ6
ß/8
ß tg mice
developed severe experimental polychondritis, exhibiting both
polyarthritis and auricular chondritis. The clinical, serologic, and
histologic manifestations of experimental polychondritis are similar to
those symptoms in human relapsing polychondritis. The susceptibility of
DQ6
ß/8
ß tg mice compared with resistance in the parental
strains suggests that expression of both the DQ6
ß and DQ8
ß
tgs, unique to the DQ6
ß8
ß tg strain, is important in
susceptibility to experimental polychondritis. The DQ6
ß/8
ß tg
mice provide a model to investigate putative autoantigens and the
mechanisms of pathogenesis involved in relapsing polychondritis as well
as the influence of the expression of multiple HLA class II molecules
on the disease process.
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