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Related Experiment Videos

Interleukin-4 and interleukin-13 differentially regulate epithelial chloride secretion

G Zünd1, J L Madara, A L Dzus

  • 1Center for Experimental Therapeutics and Reperfusion Injury, Department of Anesthesia, Brigham and Women's Hospital, Boston, Massachusetts 02115, USA.

The Journal of Biological Chemistry
|March 29, 1996
PubMed
Summary

Interleukin-4 (IL-4) and Interleukin-13 (IL-13) impact intestinal epithelial barrier function and ion transport differently. While both cytokines increase permeability, only IL-4 reduces chloride secretion and fluid transport, highlighting cytokine-specific effects.

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Area of Science:

  • Immunology
  • Gastroenterology
  • Cell Biology

Background:

  • Intestinal epithelial cells interact with lymphocytes, which produce cytokines like interferon-gamma, IL-4, and IL-13.
  • Previous studies identified epithelial receptors for interferon-gamma, IL-4, and IL-13.

Purpose of the Study:

  • To investigate the effects of IL-4 and IL-13 on the ion transport properties of T84 intestinal epithelial cells.
  • To determine the specificity of IL-4 and IL-13 in modulating epithelial barrier function and ion transport.

Main Methods:

  • T84 epithelial cell monolayers were exposed to varying doses and times of IL-4 and IL-13.
  • Epithelial barrier function was assessed by measuring paracellular flux of a dextran marker.
  • Ion transport, specifically chloride secretion, was measured using epithelial short-circuit current.

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  • Changes in cystic fibrosis transmembrane regulator (CFTR) expression were analyzed following IL-4 exposure.

    • Main Results:

    • Both IL-4 and IL-13 significantly attenuated epithelial barrier function, increasing paracellular flux by over 65%.
    • IL-4, but not IL-13, diminished stimulated chloride secretion, linked to reduced chloride channel activity and CFTR expression.
    • Stimulated fluid transport across epithelia was decreased by IL-4 but unaffected by IL-13.

    Conclusions:

    • IL-4 and IL-13 exhibit distinct effects on intestinal epithelial ion transport and fluid secretion, despite potentially similar post-receptor signaling pathways.
    • These findings underscore the cytokine-specific functional outcomes in epithelial responses to immune mediators.