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EGF stimulates polyamine uptake in Caco-2 cells

V Milovic1, C Deubner, S Zeuzem

  • 12nd Department of Medicine, Johann Wolfgang Goethe University, Frankfurt/Main, Germany.

Biochemical and Biophysical Research Communications
|January 26, 1995
PubMed
Summary

Epidermal growth factor (EGF) stimulates polyamine uptake in Caco-2 cells, particularly in younger cells. This stimulation involves tyrosine phosphorylation, not new protein synthesis.

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Area of Science:

  • Cell biology
  • Molecular biology
  • Biochemistry

Background:

  • Epidermal growth factor (EGF) is a potent signaling molecule.
  • Polyamines are essential for cell growth and differentiation.
  • Caco-2 cell monolayers serve as a model for intestinal epithelium.

Purpose of the Study:

  • To investigate the effect of EGF on polyamine uptake in Caco-2 cells.
  • To determine the mechanism underlying EGF-stimulated polyamine uptake.

Main Methods:

  • Caco-2 cells were cultured to confluence (day 7) or differentiation (day 14).
  • Polyamine uptake was measured in the presence and absence of EGF.
  • Experiments were conducted using cycloheximide (protein synthesis inhibitor) and genistein (tyrosine kinase inhibitor).

Main Results:

  • EGF dose-dependently stimulated polyamine uptake in Caco-2 cells.
  • Uptake rates were higher in 7-day-old cells compared to 14-day-old cells.
  • EGF increased Vmax and affinity for putrescine and spermine.
  • EGF-stimulated uptake was not affected by cycloheximide but was completely inhibited by genistein.

Conclusions:

  • EGF enhances polyamine uptake in Caco-2 cells via a mechanism involving tyrosine phosphorylation.
  • The effect is likely due to protein translocation or direct transporter alteration, not de novo protein synthesis.
  • Cellular differentiation state influences EGF's effect on polyamine transport.