Antigenic differences between AKR lymphoma and thymus cells leading to detection of a tumor antigen associated with immunological enhancement.
In an experimental model conditioning for enhancement, an AKR lymphoma was made to grow in BALB/c mice, permitting the simultaneous comparison of tumor-bearing (progressor) and tumor-rejecting (regressor) animals. By immunofluorescence using as target AKR lymphoma and normal thymus cells, both acetone-fixed and unfixed, it was observed that the allogeneic progressor serum contained three antibodies, two of which could be asborbed by thymocytes while the other combined selectively with the acetone-fixed lymphoma target. This tumor-specific antibody could not be detected in regressor serum which, on the other hand, could be completely absorbed by thymocytes. The identification of this acetone-resistant tumor antigen led to the preparation of aceton-treated acellular lymphoma extracts: a precipitate was obtained which upon inoculation in BALB/c mice produced an antiserum that combined selectively with lymphoma targets. In vivo experiments showed that pretreatment with this antigen led to a significant increase in allogeneic tumor incidence, 76% as compared to 37% in the controls. It is concluded that in this allogeneic model, an acetone-resistant tumor-specific antigen and the corresponding antibody are involved in tumor enhancement.
D000818:Animals; D000912:Antibodies, Neoplasm; D000951:Antigens, Neoplasm; D000939:Epitopes; D005260:Female; D008223:Lymphoma / Q000276:immunology*; D008297:Male; D051379:Mice; D008806:Mice, Inbred AKR; D008807:Mice, Inbred BALB C; D009368:Neoplasm Transplantation; D009374:Neoplasms, Experimental / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology*; D014184:Transplantation, Homologous
D000912:Antibodies, Neoplasm; D000951:Antigens, Neoplasm; D000939:Epitopes