Abstract
The genetically engineered chimeric cB72.3m4 and cB72.3m12 antibodies recognize the same tumor-associated TAG72 antigen. The high-affinity cB72.3m4 antibody had an approximately 18-fold higher affinity constant for the TAG72 antigen than the low-affinity cB72.3m12 antibody. The relationship between antibody affinity and tumor targeting was studied by using these two antibodies. In biodistribution and imaging studies in athymic mice bearing LS174T human colon cancer xenografts, the radiolabelled high-affinity cB72.3m4 antibody was rapidly cleared from the blood, whereas the low-affinity cB72.3m12 antibody had slower blood clearance. The data showed that the high-affinity cB72.3m4 antibody appeared to localize more in tumors (based on tumor:normal-tissue ratios) than did the low-affinity cB72.3m12 antibody, and enhanced the target-to-nontarget image contrast. This study provides evidence that the high-affinity chimeric antibody cB72.3m4 may be useful in both immunodetection and immunotherapy of cancer.
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Abbreviations
- DMEM:
-
modified Eagle's medium
- FCS:
-
fetal calf serum
- PBS:
-
phosphate-buffered saline
- BSA:
-
bovine serum albumin
- SDS-PAGE:
-
sodium dodecyl sulfate/polyacrylamide gel electrophoresis
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This study is supported by research grants of the Medical Research Council of Canada and the Saskatchewan Cancer Foundation. Jim Xiang is a research scholar of MRC of Canada
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Qi, Y., Matte, G., Wilkinson, A. et al. High-affinity chimeric anti-(colorectal carcinoma) antibody correlated to enhanced tumor targeting in biodistribution and imaging. J Cancer Res Clin Oncol 120, 57–62 (1993). https://doi.org/10.1007/BF01200725
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DOI: https://doi.org/10.1007/BF01200725