PMID: 42903Nov 1, 1979

Epidermal growth factor stimulation of DNA synthesis is potentiated by compounds that inhibit its clustering in coated pits

Proceedings of the National Academy of Sciences of the United States of America
F R MaxfieldI Pastan

Abstract

We have used inhibitors of receptor-mediated endocytosis to investigate the mechanism and function of epidermal growth factor uptake by cultured cells. When rhodamine-labeled epidermal growth factor is bound to cell surface receptors on confluent monolayers of BALB/c 3T3 cells, it rapidly collects in cell surface clusters and is internalized. The clustering of occupied receptors requires Ca(2+) and is inhibited by primary alkylamines; both of these properties are shared by the enzyme transglutaminase (R-glutaminyl-peptide:amine gamma-glutamyl-yltransferase, EC 2.3.2.13). In Chinese hamster ovary cell extracts, methylamine inhibits 25-50% of the transglutaminase activity with a K(i) of 0.2 mM, and it inhibits the remaining transglutaminase activity with a K(i) of 20 mM. Clustering is almost completely inhibited by 10 mM methylamine. The polypeptide antibiotic bacitracin inhibits clustering of rhodamine-labeled epidermal growth factor or alpha(2)-macroglobulin at 0.7 mM, and it inhibits approximately 40% of the transglutaminase activity in Chinese hamster ovary cells with a K(i) of 0.03 mM. Fluorescent ligands bound to cell surface receptors in the presence of bacitracin form clusters within 30 min after bacitracin is removed fro...Continue Reading

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Related Concepts

Ovarian Diseases
Chinese Hamster
Bacitracin
Amines
Methylamines
Endocytosis
Mice, Inbred BALB C
Epidermal Growth Factor
Both Ovaries
Gamma-glutamyl transferase

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