title: Distribution of radiolabeled alloantibodies in mice bearing 3-methylcholanthrene-induced sarcoma.
abstract: The distribution of purified 125I-labeled alloantibodies, prepared from the serum of DBA/2J mice obtained after immunization with C3H/HeJ spleen cells, was studied in immunosuppressed DBA/2J mice bearing either allogeneic C3H/HeJ 3-methylcholanthrene sarcomas growing s.c. or syngeneic SaD2 3-methylcholanthrene sarcomas. Once purified radiolabeled antibody was isolated from 125I-labeled immune gamma-globulin by a single adsorption onto C3H/HeJ RBC and elution from stroma prepared from these cells, by using 0.1 M glycine buffer (pH 3.0). Twice-purified alloantibody was then produced by Bio-Gel P-200 or Sephadex G-200 gel filtration chromatography or DEAE A-50 ion-exchange chromatography. In vitro, such purified antibodies bound specifically to C3H/HeJ RBC. In vivo, they localized to a significant extent following i.p. injection, preferentially in C3H/HeJ 3-methylcholanthrene sarcomas (4.4 to 8.9% of the injected dose per g of tumor equal to 1% of mouse weight), with mean tumor/blood ratios of 4.0 to 7.8, at 24 or 48 hr after injection. The percentage of injected dose localized in tumor and the tumor/blood ratio did not show significant differences with respect to time or method of antibody purification. Normal tissue/blood ratios in C3H/HeJ or SaD2 sarcoma-bearing mice were less than 0.9. The tumor/blood ratios in SaD2 sarcomas were approximately 0.6. Injection of 131I-labeled normal DBA/2J gamma-globulin resulted in normal tissue/blood and tumor/blood ratios of less than 0.9 in C3H/HeJ tumor-bearing mice.
mesh_terms: D000818:Animals; D000918:Antibody Specificity; D007457:Iodine Radioisotopes; D007518:Isoantibodies / Q000032:analysis*; D008297:Male; D008748:Methylcholanthrene; D051379:Mice; D008809:Mice, Inbred C3H / Q000276:immunology; D008811:Mice, Inbred DBA / Q000276:immunology; D009368:Neoplasm Transplantation; D012513:Sarcoma, Experimental / Q000097:blood / Q000139:chemically induced / Q000276:immunology*; D014018:Tissue Distribution; D014184:Transplantation, Homologous
chemical_list: D007457:Iodine Radioisotopes; D007518:Isoantibodies; D008748:Methylcholanthrene