title: Role of Mls-1 locus and clonal deletion of T cells in susceptibility to collagen-induced arthritis in mice.
abstract: The role of T cell-mediated and humoral immunity to type II collagen has been well documented in collagen-induced arthritis (CIA). Previous work from our laboratory has indicated that genomic deletions of TCR V beta genes may play a role in CIA resistance in mice. This indicated a selectivity of TCR usage by autoreactive T cells in CIA in mice. Certain strains of mice, although having a normal genomic V beta TCR repertoire, can show clonal deletion of peripheral T cells that bear specific V beta gene products in their TCR. These clonally deleted T cells are reactive with self-Ag such as minor lymphocyte stimulation (Mls) Ag. An Mls-congenic strain, BALB.D2.Mlsa, which differs only at the Mls-1 a locus from BALB/c (Mls-1b), was used to examine the effect of clonal deletion of Mls-1a-reactive T cells in CIA. These two strains were crossed to three CIA-susceptible strains, B10.RIII (H-2r, Mls-1b), DBA/1 (H-2q, Mls-1a), and B10.Q (H-2q, Mls-1b), and the crosses were injected with type II collagen. A significantly decreased incidence of arthritis was observed in the (BALB.D2.Mlsa x B10.Q)F1 hybrids, compared with (BALB/c x B10.Q)F1 hybrids, upon immunization with chick type II collagen. The BALB.D2.Mlsa cross mice also had significantly lower levels of antimouse collagen antibodies. Flow cytometric analysis confirmed the clonal deletion of Mls-1a-reactive V beta 8.1, V beta 6, V beta 7, and V beta 9 subsets in the (BALB.D2.Mlsa x B10.Q)F1 hybrids. The study of H-2q/d mice in (BALB.D2.Mlsa x B10.Q) x B10.Q back-crosses demonstrated a significant correlation between CIA resistance and Mls-1a locus. On the other hand, B10.RIII crosses showed only a modest decrease in CIA incidence in the presence of Mls-1a. As expected, all the DBA/1 crosses had an equal incidence of CIA, which was somewhat less than that seen in DBA/1 mice themselves. These studies point out that the Mls-1a locus could play a role in decreasing CIA incidence by clonal deletion of T cells bearing specific V beta TCR, which may be involved in the pathogenesis of CIA. The influence of the clonal deletion of T cells on CIA, and hence the usage of specific V beta TCR by autoreactive anti-type II collagen T cells, however, depends not only on the source of the type II collagen and the MHC class II molecules involved but also on other background genes in mice.
authors.affiliation: Department of Immunology, Mayo Clinic and Medical School, Rochester, MN 55905.
authors.forename: G D
authors.initials: GD
authors.lastname: Anderson
authors.forename: S
authors.initials: S
authors.lastname: Banerjee
authors.forename: H S
authors.initials: HS
authors.lastname: Luthra
authors.forename: C S
authors.initials: CS
authors.lastname: David
mesh_terms: D000818:Animals; D000906:Antibodies / Q000032:analysis; D000954:Antigens, Surface / Q000235:genetics*; D001168:Arthritis / Q000209:etiology*; D002874:Chromosome Mapping; D003094:Collagen / Q000276:immunology*; D003433:Crosses, Genetic; D000949:Histocompatibility Antigens Class II / Q000502:physiology; D051379:Mice; D008815:Mice, Inbred Strains; D016747:Minor Lymphocyte Stimulatory Antigens; D011948:Receptors, Antigen, T-Cell / Q000032:analysis / Q000235:genetics; D013601:T-Lymphocytes / Q000502:physiology*
chemical_list: D000906:Antibodies; D000954:Antigens, Surface; D000949:Histocompatibility Antigens Class II; D016747:Minor Lymphocyte Stimulatory Antigens; D011948:Receptors, Antigen, T-Cell; D003094:Collagen