title: Suppression of T cell-mediated cutaneous basophil hypersensitivity by serum from guinea pigs immunized with mycobacterial adjuvant.
abstract: Guinea pigs immunized with protein antigens emulsified with complete Freund's adjuvant (CFA) and skin tested at 3-4 wk have classical tuberculin-type delayed hypersensitivity (DH) reactions with few basophils present. However, recipients of T cells from these animals have delayed responses containing large basophil infiltrates and thus resemble basophil-rich cutaneous basophil hypersensitivity (CBH) responses that are elicited in animals immunized without CFA. This suggests that animals immunized with CFA have T cells with basophil-recruiting capacity but that this activity is suppressed. Using a transfer system, we found that immune serum from donors immunized with CFA had the ability to suppress the basophil-recruiting capacity of immune T cells. When immune serum and peritoneal exudate cells from guinea pigs immunized with CFA were co-transferred intravenously to normal recipients, the cell-mediated transfer of basophil-rich responses was suppressed. The responsible serum factor was antigen nonspecific, had an approximately 70,000 mol wt, and acted preferentially on cells from donors that express basophil-poor DH responses. Thus, tuberculin-type delayed hypersensitivity and CBH might be mediated by a common T cell, but the resulting basophil component of the delayed response depends on the modulation of T cell recruitment of basophils by factors in CFA-immune serum.
mesh_terms: D000818:Animals; D001491:Basophils / Q000276:immunology*; D005591:Chemical Fractionation; D000939:Epitopes; D005260:Female; D005620:Freund's Adjuvant / Q000494:pharmacology; D006168:Guinea Pigs; D006433:Hemocyanins / Q000276:immunology; D006968:Hypersensitivity, Delayed / Q000276:immunology*; D007106:Immune Sera / Q000494:pharmacology; D007116:Immunization, Passive; D007165:Immunosuppression Therapy; D009169:Mycobacterium tuberculosis / Q000276:immunology; D010081:Oxazolone / Q000276:immunology; D012882:Skin Tests; D013601:T-Lymphocytes / Q000276:immunology*; D013997:Time Factors
chemical_list: D000939:Epitopes; D007106:Immune Sera; D010081:Oxazolone; D005620:Freund's Adjuvant; D006433:Hemocyanins