Exogenous ATP and other nucleoside phosphates modulate epidermal growth factor receptors of A-431 epidermoid carcinoma cells

K. Hosoi, M. Edidin

Research output: Contribution to journalArticlepeer-review

Abstract

The binding of epidermal growth factor (EGF) by A-431 human epidermoid carcinoma cells was reduced after exposure of the cells to low concentrations (0.01-1 mM) of ATP and other nucleoside 5'-triphosphates at 37°C, but not at 0°C. This was due to loss of high-affinity EGF binding sites. The modulation was associated with transient increases in inositol phosphate synthesis and intracellular Ca2+ and with phosphorylation of the EGF receptor on serine and threonine. There was no evidence for entry of labeled ATP into the cells. ATP appeared to bind to specific cell surface receptors. Such binding was demonstrated directly with the nonmetabolizable ATP analogue adenosine 5'-[β,γ-imido]triphosphate.

Original languageEnglish (US)
Pages (from-to)4510-4514
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Volume86
Issue number12
DOIs
StatePublished - 1989

ASJC Scopus subject areas

  • General

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