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Updated: Aug 25, 2026

Determination of Tolerable Fatty Acids and Cholera Toxin Concentrations Using Human Intestinal Epithelial Cells and BALB/c Mouse Macrophages
09:39

Determination of Tolerable Fatty Acids and Cholera Toxin Concentrations Using Human Intestinal Epithelial Cells and BALB/c Mouse Macrophages

Published on: May 30, 2013

Cholera toxin induces expression of ion channels and carriers in rat small intestinal mucosa

Carl-Fredrik Flach1, Stefan Lange, Eva Jennische

  • 1Medical Microbiology and Immunology, Box 435, SE40530 Göteborg, Sweden.

FEBS Letters
|March 12, 2004
PubMed

Insights

Cholera toxin alters gene expression in the rat small intestine, affecting nutrient transporters and ion channels. These changes, including increased nucleoside and glucose uptake, normalize as intestinal cells regenerate.

Area of Science:

  • Gastroenterology
  • Molecular Biology
  • Cell Biology

Background:

  • Cholera toxin induces electrolyte and water secretion in the small intestine via cyclic adenosine monophosphate (cAMP).
  • Understanding toxin-induced gene expression changes is crucial for comprehending intestinal response and developing treatments.

Purpose of the Study:

  • To investigate the alterations in gene expression within the rat small intestine following cholera toxin challenge.
  • To identify specific genes and transporters affected by cholera toxin and their temporal dynamics.

Main Methods:

  • Microarray technique was employed to evaluate global gene expression changes.
  • Semiquantitative polymerase chain reaction (PCR) was used to validate key findings from the microarray analysis.

Main Results:

  • Upregulation of nucleoside transporter CNT2 and glucose transporter GLUT1 observed between 6-18 hours post-challenge, likely enhancing nutrient absorption.
  • Upregulation of chloride channel ClC2 and mucin-producing genes at 18 hours.
  • Downregulation of Aquaporin 8 at 6 hours, with overall gene expression returning to normal by 72 hours.

Conclusions:

  • Cholera toxin significantly impacts gene expression in the small intestine, influencing nutrient transport, ion channels, and mucus production.
  • The observed changes in gene expression are transient, resolving within the typical turnover period of intestinal epithelial cells (72 hours).
  • These findings provide insights into the molecular mechanisms underlying cholera's effects on intestinal function.

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