PMID: 8962138Dec 10, 1996Paper

Recombinant immunotoxins specific for a mutant epidermal growth factor receptor: targeting with a single chain antibody variable domain isolated by phage display

Proceedings of the National Academy of Sciences of the United States of America
I A LorimerI Pastan

Abstract

EGFRvIII is a mutant epidermal growth factor receptor found in glioblastoma, and in carcinoma of the breast, ovary, and lung. The mutant receptor has a deletion in its extracellular domain that results in the formation of a new, tumor-specific extracellular sequence. Mice were immunized with a synthetic peptide corresponding to this sequence and purified EGFRvIII. A single chain antibody variable domain (scFv) phage display library of 8 x 10(6) members was made from the spleen of one immunized mouse. A scFv specific for EGFRvIII was isolated from this library by panning with successively decreasing amounts of synthetic peptide. This was used to make an immunotoxin by fusing the scFv DNA sequence to sequences coding for domains II and III of Pseudomonas exotoxin A. Purified immunotoxin had a Kd of 22 nM for peptide and a Kd of 11 nM for cell-surface EGFRvIII. The immunotoxin was very cytotoxic to cells expressing EGFRvIII, with an IC50 of 1 ng/ml (16 pM) on mouse fibroblasts transfected with EGFRvIII and an IC50 of 7-10 ng/ml (110-160 pM) on transfected glioblastoma cells. There was no cytotoxic activity at 1000 ng/ml on the untransfected parent glioblastoma cell line. The immunotoxin was completely stable upon incubation at 37 ...Continue Reading

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