Abstract
A monoclonal antibody, GC302, was established by fusing murine myeloma NS/1 cells with the splenocytes of a BALB/c mouse immunized with a human gastric cancer cell line, NU-GC-3. The serological specificity of GC302 was analyzed by an anti-mouse Ig mixed-hemadsorption (MHA) test on a panel of human cell lines, and an immunoperoxidase method using the frozen sections of tumors and normal tissues of adult and fetus. GC302 reacted with cancers of the stomach and colorectum but did not react with hepatocellular carcinomas, melanomas, or astrocytomas in the MHA tests. By the immunoperoxidase method, GC302 was found not to react with normal adult gastric mucosa, but to react with the mucosa in the fetal stomach, intestinal metaplasia, and almost all of the cancer of the stomach. GC302 also reacted with the normal mucosa of the intestine, colon, and rectum as well as with cancers of these origins. In normal liver sections, the antibody reacted with the bile ducts, but not with the hepatic cells. These results indicate that the antigen detected by GC302 is characterized as an oncofetal antigen in the stomach, and also as a differentiation antigen whose localization discriminates between the gastrointestinal tracts of the forgut origin and those of the midgut and hindgut origin. The molecular weight of the GC302 antigen was estimated to beca. 40,000 by the Western blot analysis. Periodic acid treatment on the antigen suggested that the antigenic determinant is a carbohydrate.
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Watanabe, T., Nishikimi, M., Akiyama, S. et al. A stomach oncofetal antigen recognized by monoclonal antibody GC302. The Japanese Journal of Surgery 17, 507–516 (1987). https://doi.org/10.1007/BF02470755
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DOI: https://doi.org/10.1007/BF02470755