Faculty Research 1980 - 1989

Receptor modulating properties of an antibody directed against the epidermal growth factor receptor.

Document Type

Article

Publication Date

1984

Keywords

Autoradiography, Cell-Line, Chromatography-Affinity, DNA: bi, Electrophoresis-Polyacrylamide-Gel, Human, Immune-Sera, Mice, Protein-Conformation, Protein-Kinases, Receptors-Endogenous-Substances: im, me, Substrate-Specificity, SUPPORT-U-S-GOVT-P-H-S

First Page

429

Last Page

434

JAX Source

Eur J Biochem 1984 Jun 1;141(2):429-34

Grant

AM25819, CA18470, CA10815

Abstract

A murine antiserum with specificity for the human epidermal growth factor (EGF) receptor was used to investigate EGF receptor function. The IgG fraction of this antiserum displayed no EGF-like mitogenic activity, even when cross-linking was ensured by sequential treatment with rabbit anti-(mouse IgG). The interaction of antibody with solubilized purified EGF receptor was characterized in detail. The binding of 125I-antibody to the receptor was not blocked by EGF, but the binding of 125I-EGF to the receptor was blocked by the immune IgG. Scatchard analysis of this reaction revealed a reduction in maximal EGF binding but an enhanced EGF binding affinity. In addition, at low concentrations, the immune IgG was found to enhance receptor kinase activity in the absence of EGF. The enhancement of kinase activity, as measured by receptor phosphorylation, was due to a decreased Km for ATP, and an increased V. These results suggest that the antibody is capable of altering conformations at receptor active sites by binding to non-active species-specific epitopes.

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