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Monoclonal antibody C242-Pseudomonas exotoxin A. A specific and potent immunotoxin with antitumor activity on a human colon cancer xenograft in nude mice.
W Debinski, … , D FitzGerald, I Pastan
W Debinski, … , D FitzGerald, I Pastan
Published August 1, 1992
Citation Information: J Clin Invest. 1992;90(2):405-411. https://doi.org/10.1172/JCI115875.
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Research Article

Monoclonal antibody C242-Pseudomonas exotoxin A. A specific and potent immunotoxin with antitumor activity on a human colon cancer xenograft in nude mice.

Abstract

Two immunotoxins were constructed by chemically coupling the monoclonal antibody C242 to Pseudomonas exotoxin A (PE) or a modified form, NlysPE40, that lacks the cell binding domain of PE. Monoclonal antibody C242 recognizes a specific sialylated carbohydrate epitope on a high molecular weight membrane glycoprotein present on cells of human colon, pancreatic, and cervical cancers. C242-PE and C242-NlysPE40 were very cytotoxic for cells expressing this antigen with 50% inhibition of protein synthesis occurring on Colo205 cells at 0.2 ng/ml (0.9 pM) for C242-PE and 6.0 ng/ml (31 pM) for C242-NlysPE40. The two immunotoxins also exhibited a strong antitumor effect on a human colon cancer xenograft grown in nude mice. The specificity and potency of these two C242 immunotoxins warrant their further development for the treatment of cancer.

Authors

W Debinski, B Karlsson, L Lindholm, C B Siegall, M C Willingham, D FitzGerald, I Pastan

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