title: Specific suppression of delayed hypersensitivity skin reactions to collagen in guinea-pigs after immunization with collagen and Freund's incomplete adjuvant.
abstract: Partial suppression of cutaneous delayed hypersensitivity reactions to collagen in guinea-pigs was induced by pre-immunization with collagen and FIA. This suppression is specific since: (a) pretreatment with OA and FIA or FIA alone did not cause suppression of skin reactions to collagen; (b) suppression was observed only if the collagen used for pretreatment was from the same species as that employed for sensitization for delayed hypersensitivity reactions; and (c) animals with depressed skin reactivity to collagen reacted normally to PPD. The suppression is not mediated by inducible, circulating antibodies to collagen since: (a) antibody titres measured by passive haemagglutination did not correlate with the degree of suppression; (b) suppression was observed with collagen in random coil conformation which sensitizes guinea-pigs for delayed hypersensitivity skin reaction but does not induce antibodies to denatured collagen; (c) best suppression was obtained if the animals were pretreated with collagen and FIA 3 days before the sensitizing injection; and (d) passively transferred antibody from animals with suppressed skin reactivity did not suppress skin reactivity of animals made hypersensitive to collagen by injection of collagen and FCA.
mesh_terms: D000818:Animals; D000906:Antibodies / Q000032:analysis; D000918:Antibody Specificity; D003094:Collagen / Q000276:immunology*; D005620:Freund's Adjuvant; D006168:Guinea Pigs; D006386:Hemagglutination Tests; D006968:Hypersensitivity, Delayed / Q000276:immunology*; D007111:Immunity, Cellular; D007165:Immunosuppression Therapy; D007700:Kinetics; D012867:Skin / Q000276:immunology; D012882:Skin Tests
chemical_list: D000906:Antibodies; D003094:Collagen; D005620:Freund's Adjuvant