Effects of cell density and phorbol esters on the expression of epidermal growth factor receptors

A Angie Rizzino, Claire Huebert, Charles Kuszynski, Phillip J. Wilder

Research output: Contribution to journalArticle

Abstract

Previously, it has been shown that the binding of epidermal growth factor (EGF) by a wide range of cells decreases as cell density increases. In this report, we demonstrate that KB cells treated chronically with phorbol esters continue to exhibit decreases in EGF receptor binding as cell density increases. This finding suggests that protein kinase-C may not be essential for density-induced down regulation of EGF receptors, since phorbol esters are known to down regulate protein kinase-C. We also report that short-term and long-term effects of phorbol esters on the binding of EGF are affected by density. As shown previously for several cell lines, the phorbol ester 12-0-tetradecanoylphorbol-13-acetate transiently reduces EGF binding. We now show that the magnitude of this reduction diminishes as cell density increases. In addition, we determined that long-term treatment of KB cells with phorbol ester increases EGF binding. Again, this effect is diminished at high cell densities. Finally, we report that the increases in EGF binding induced by long-term treatment with phorbol esters are due to increases in the number of EGF receptors.

Original languageEnglish (US)
Pages (from-to)85-92
Number of pages8
JournalCytotechnology
Volume7
Issue number2
DOIs
StatePublished - Oct 1 1991

Fingerprint

Phorbol Esters
Esters
Epidermal Growth Factor
Cell Count
KB Cells
Protein Kinase C
Down-Regulation
Tetradecanoylphorbol Acetate
Proteins
Epidermal Growth Factor Receptor
ErbB Receptors
Acetates
Cells
Cell Line

Keywords

  • cell density
  • growth factor receptors
  • phorbol esters

ASJC Scopus subject areas

  • Biotechnology
  • Bioengineering
  • Biomedical Engineering
  • Clinical Biochemistry
  • Cell Biology

Cite this

Effects of cell density and phorbol esters on the expression of epidermal growth factor receptors. / Rizzino, A Angie; Huebert, Claire; Kuszynski, Charles; Wilder, Phillip J.

In: Cytotechnology, Vol. 7, No. 2, 01.10.1991, p. 85-92.

Research output: Contribution to journalArticle

Rizzino, A Angie ; Huebert, Claire ; Kuszynski, Charles ; Wilder, Phillip J. / Effects of cell density and phorbol esters on the expression of epidermal growth factor receptors. In: Cytotechnology. 1991 ; Vol. 7, No. 2. pp. 85-92.
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AB - Previously, it has been shown that the binding of epidermal growth factor (EGF) by a wide range of cells decreases as cell density increases. In this report, we demonstrate that KB cells treated chronically with phorbol esters continue to exhibit decreases in EGF receptor binding as cell density increases. This finding suggests that protein kinase-C may not be essential for density-induced down regulation of EGF receptors, since phorbol esters are known to down regulate protein kinase-C. We also report that short-term and long-term effects of phorbol esters on the binding of EGF are affected by density. As shown previously for several cell lines, the phorbol ester 12-0-tetradecanoylphorbol-13-acetate transiently reduces EGF binding. We now show that the magnitude of this reduction diminishes as cell density increases. In addition, we determined that long-term treatment of KB cells with phorbol ester increases EGF binding. Again, this effect is diminished at high cell densities. Finally, we report that the increases in EGF binding induced by long-term treatment with phorbol esters are due to increases in the number of EGF receptors.

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