Idiotype-specific T helper clones recognize a variable H chain determinant.
Previously we described a Th clone specific for a regulatory idiotype on 3A4, an anti-Id mAb that mimics a murine L1210/GZL tumor-associated Ag. In our studies, we determined the molecular target on the stimulating anti-Id antibody that is recognized by the Th clone. The Th clone responds with proliferation to the H chain of 3A4 but not to the L chain. Furthermore, the 3A4 chain stimulates this Th clone more efficiently than either the intact 3A4 or the Fab fragments, and the presentation by APC of the H chain is more resistant to chloroquine treatment than the presentation of the intact 3A4 molecule. These results suggest that regulatory T cells "see" their target idiotopes as linear sequence determinants present on isolated Ig chains, and show that this might have biologic advantages with respect to the mechanism of Ag presentation.
Saeki
Y
Y
IDEC Pharmaceuticals Corporation, La Jolla, CA 92037.
Chen
J J
JJ
Shi
L F
LF
Okuda
Y
Y
Köhler
H
H
D000818:Animals; D000888:Antibodies, Anti-Idiotypic / Q000276:immunology*; D000911:Antibodies, Monoclonal / Q000276:immunology; D000938:Antigen-Presenting Cells / Q000187:drug effects / Q000276:immunology; D002738:Chloroquine / Q000494:pharmacology; D000939:Epitopes; D005976:Glutaral / Q000494:pharmacology; D007143:Immunoglobulin Heavy Chains / Q000276:immunology*; D007130:Immunoglobulin Idiotypes / Q000276:immunology*; D051379:Mice; D008811:Mice, Inbred DBA; D006377:T-Lymphocytes, Helper-Inducer / Q000276:immunology*
D000888:Antibodies, Anti-Idiotypic; D000911:Antibodies, Monoclonal; D000939:Epitopes; D007143:Immunoglobulin Heavy Chains; D007130:Immunoglobulin Idiotypes; D002738:Chloroquine; D005976:Glutaral