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. 1991 Oct;2(10):827–840. doi: 10.1091/mbc.2.10.827

Epidermal growth factor-stimulated calcium ion transients in individual A431 cells: initiation kinetics and ligand concentration dependence.

T E Cheyette 1, D J Gross 1
PMCID: PMC361878  PMID: 1801919

Abstract

The A431 epidermoid carcinoma cell line responds to epidermal growth factor (EGF) stimulation with a number of rapid changes, including alterations in free cytosolic calcium ion concentration ([Ca2+]i). At the single cell level, these changes in [Ca2+]i are known to proceed after a clear lag phase subsequent to EGF stimulus (Gonzalez et al., 1988). The present study explores the dependence on EGF concentration of this early [Ca2+]i signal. High levels of EGF (9.0-4.3 nM) produce a [Ca2+]i spike followed by an elevation of [Ca2+]i above basal levels. The time of initiation of the spike varies from 5 to 9 s at the high dose and from 8 to 32 s at the low dose in cells that respond. A lower level of EGF (1.5 nM) produces [Ca2+]i oscillations with no prolonged elevation over basal [Ca2+]i. The initiation of response at this [EGF] ranges from 20 to 410 s. Intermediate stimulus levels generate [Ca2+]i responses that are kinetic admixtures of these limiting responses. A simple model based on the enzymatically amplified signal cascade from ligand binding through Ca2+ release or influx is examined. The model predicts a prolonged lag phase followed by a rapid increase in the [CA2+]i signal that compares favorably with the data reported here.

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Selected References

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