title: Tumorigenicity in athymic mice of the human colon carcinoma cell line SW1116 expressing the tumor-associated antigenic determinant CA 19-9.
abstract: The human colorectal carcinoma cell line SW1116 under optimal growth conditions synthesized and shed antigens bearing the monoclonal antibody-defined carbohydrate determinant CA 19-9. Antigen expressing CA 19-9 in cell culture supernatant was quantitated by an immunoradiometric assay for CA 19-9. Injection of SW1116 cells s.c. into athymic BALB/c mice resulted in the growth of moderately differentiated tumors possessing a distinct morphological resemblance to a typical adenocarcinoma of the colon. Intervals to tumor appearance were dependent on inoculum dose, but 95% of mice at both 5 X 10(6) and 10(7) cells/mouse developed tumors within 14 to 21 days. CA 19-9 antigen was detected in the sera of all nude mice with SW1116 tumors, and antigen concentration correlated (r = 0.77) with tumor volume throughout the 9-week study. The half-life of this antigen in serum following tumor excision from nude mice was 6.5 +/- 1.5 (S.D.) hr. Carcinoembryonic antigen was also detected in serum from mice bearing SW1116 tumors by an immunoradiometric assay for carcinoembryonic antigen, but its concentration correlated (r = 0.86) with tumor volume for only the first 4 weeks of tumor growth. Significant levels of endogenous immunoglobulin G1 and immunoglobulin G3 antibodies to CA 19-9 antigen were found in the serum of nude mice with SW1116 tumors by radioimmunodiffusion, but no apparent relationship between antibody titer and tumor growth or CA 19-9 antigen level in serum was evident. This tumor model may be useful in devising radioimmunodetection and immunotherapeutic strategies for primary and metastatic human colon carcinomas.
mesh_terms: D000818:Animals; D000951:Antigens, Neoplasm / Q000032:analysis*; D002455:Cell Division; D002460:Cell Line; D003110:Colonic Neoplasms / Q000276:immunology* / Q000473:pathology; D003602:Cytotoxicity, Immunologic; D000939:Epitopes / Q000032:analysis*; D006801:Humans; D007700:Kinetics; D051379:Mice; D008819:Mice, Nude; D009368:Neoplasm Transplantation; D014183:Transplantation, Heterologous
chemical_list: D000951:Antigens, Neoplasm; D000939:Epitopes