Regulation of the immune response. II. Concomitant idiotope-specific enhancement and suppression can result in a phenotypically normal response.
Idiotope-specific immunoenhancement or suppression was induced in C57BL/6 mice by the injection of physiological amounts (100 ng-10 micrograms) of monoclonal anti-idiotope antibody. As previously described, nanogram doses enhanced idiotope expression while a 10-micrograms dose of anti-idiotope antibody induced the activation of a population of Thy 1.2+, Lyt 1-, 2+ suppressors. Both positive and negative regulatory activities were confined to the non-mu, idiotope+ compartment of the plaque-forming cell response. Administration of intermediate doses of anti-idiotope antibody resulted in an immune state indistinguishable from that of naive mice. This apparently normal response was in fact the product of a simultaneous activation of balanced enhancing and suppressive activities. When treated with anti-Lyt 2 or Lyt 1 and complement, spleen cell populations taken from such phenotypically "naive" mice revealed latent idiotope-specific immunoenhancement or suppression, demonstrating the components of a functional regulatory equilibrium.
D000818:Animals; D000888:Antibodies, Anti-Idiotypic / Q000096:biosynthesis* / Q000502:physiology; D000911:Antibodies, Monoclonal / Q000096:biosynthesis / Q000502:physiology*; D002645:Chickens; D005260:Female; D005362:Ficoll / Q000276:immunology; D006462:Hemolytic Plaque Technique; D007130:Immunoglobulin Idiotypes / Q000276:immunology*; D008213:Lymphocyte Activation; D051379:Mice; D008810:Mice, Inbred C57BL; D009596:Nitrophenols / Q000276:immunology; D010641:Phenotype; D010648:Phenylacetates; D013154:Spleen / Q000166:cytology; D050378:T-Lymphocytes, Regulatory / Q000145:classification / Q000276:immunology*
D000888:Antibodies, Anti-Idiotypic; D000911:Antibodies, Monoclonal; D007130:Immunoglobulin Idiotypes; D009596:Nitrophenols; D010648:Phenylacetates; C026242:4-hydroxy-5-nitrophenyl acetic acid; D005362:Ficoll