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Related Experiment Videos

Glucose elevates ornithine decarboxylase expression in Vero cells.

D W Lundgren1, S L Prokay

  • 1Department of Pediatrics, Case Western Reserve University School of Medicine, Cleveland, Ohio 44109.

Journal of Cellular Physiology
|December 1, 1988
PubMed
Summary

Vero cells amplify ornithine decarboxylase (ODC) activity significantly with glucose-rich media, independent of amino acid transport. This ODC amplification is linked to cellular energy and ion flux changes.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Enzymology

Background:

  • Ornithine decarboxylase (ODC) is a key enzyme in polyamine synthesis, crucial for cell growth and proliferation.
  • Vero cells are a widely used cell line in biological research and vaccine production.
  • Understanding ODC regulation is vital for controlling cellular processes.

Purpose of the Study:

  • To investigate the factors influencing ornithine decarboxylase (ODC) amplification in Vero cells.
  • To determine the role of amino acid transport and glucose in ODC expression.
  • To explore the relationship between ODC activity and cellular energetics/ion fluxes.

Main Methods:

  • Incubation of Vero cells in Earle's balanced salt solution (EBSS) with varying glucose concentrations and other carbohydrates.

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  • Measurement of ODC activity under different incubation times and ionic conditions (Na+, K+).
  • Assessment of ODC expression in response to amino acid supplementation.

    • Main Results:

    • Earle's balanced salt solution (EBSS) alone significantly elevated ODC activity in Vero cells.
    • ODC activity increased with glucose concentration, time, and in the presence of Na+ and K+.
    • Mannose or fructose also enhanced ODC activity, and amino acids like alanine further boosted it in glucose-free media.
    • ODC expression was more responsive to glucose in high-density quiescent cultures.

    Conclusions:

    • Amino acid transport is not essential for ODC amplification in Vero cells.
    • ODC expression is strongly linked to glucose availability and cellular energy status.
    • Ion fluxes, particularly Na+ and K+, play a role in glucose-mediated ODC enhancement.