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The Journal of Immunology, Vol 130, Issue 6 2920-2925, Copyright © 1983 by American Association of Immunologists

ARTICLES

T cell allotypic determinants encoded by genes linked to the immunoglobulin heavy chain locus. I. Establishment of monoclonal antibodies against allotypic determinants

Y Aihara, I Tadokoro, K Katoh, M Minami and K Okuda

Monoclonal alloantibodies for T cell allotypic determinants were obtained by hybridizing SP-2 tumor cells with BALB/c (H-2d, Igh-1a) spleen cells, which had been repeatedly immunized with Con A-stimulated CB-20 (H-2d, Igh-1b) spleen cells. It was found that these monoclonal anti-CB-20 antibodies detect the new allotypic determinants (distinct from the B cell Igh-C region determinant) expressed only on the augmenting or suppressor T cells. Genetic analysis of these antigenic determinants revealed these antibodies react with the gene products located on the telomeric side chromosome of the Igh variable region gene (Igh-V) cluster. These antibodies when given in vivo caused a modification of antibody production. The antibody activity was absorbed by Con A-stimulated B10.BR (H-2b, Igh-1b), C57BL/6 (H-2b, Igh-1b), CWB (H-2b, Igh-1b), CB-20 (H-2d, Igh-1b), and BAB-14 (H-2d, Igh-1b) spleen cells, but not by Con A-stimulated C3H.SW (H-2b, Igh-1j), BALB/c (H-2d, Igh-1a), A/Sn (H-2a, Igh-1e), and C.AL-20 (H-2d, Igh-1d) spleen cells. In addition, in vivo these monoclonal antibodies modified anti-SRBC antibody production only in Igh-1b allotype-bearing mice. One monoclonal antibody reacted with 4-hydroxy-3-nitrophenyl acetyl- (NP) hapten-specific augmenting T cells, and the other two batches of monoclonal antibodies reacted with NP-specific suppressor T cells of NP- mediated cutaneous responses. A mapping study with these recombinants limits the gene coding for the T cell-specific determinants to a gene within the variable region to the telomeric side of NP-VH and to the centromeric side of prealbumin. This segment is inclusive of all immunoglobulin genes, the region Owen named IgT-C, and a histocompatibility gene (H-Ig).




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