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Basic Three-Dimensional (3D) Intestinal Model System with an Immune Component.

Francesca Truzzi1, Silvia Dilloo2, Xinyue Chang2

  • 1Department of Agricultural and Food Sciences, Alma Mater Studiorum-University of Bologna; francesca.truzzi3@unibo.it.

Journal of Visualized Experiments : Jove
|September 7, 2023
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Summary
This summary is machine-generated.

A new 3D intestinal model using cell lines offers a simple yet complex alternative to animal testing for studying inflammatory bowel diseases. This model allows for detailed analysis of tissue changes and immune responses, aiding in drug screening and toxicity assessments.

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Area of Science:

  • Gastroenterology
  • Cell Biology
  • Immunology

Background:

  • Increasing demand for in vitro models to replace animal studies in intestinal disease research.
  • Need for standardized, physiologically relevant intestinal models for drug screening and toxicity testing.
  • Current limitations in existing in vitro models for comprehensive analysis of inflammatory responses.

Purpose of the Study:

  • To present a protocol for a basic, three-dimensional (3D) intestinal equivalent model using cell lines.
  • To demonstrate the model's utility in studying inflammatory intestinal diseases and evaluating food component effects.
  • To highlight the model's capacity for simple, repeatable, and physiologically complex experimental outcomes.

Main Methods:

  • Development of a 3D intestinal model incorporating Caco-2 enterocytes, U937 monocytes, and L929 fibroblasts.
  • Utilization of paraffin embedding and Hematoxylin and Eosin (H&E) staining for light microscopic evaluation.
  • Analysis of tight junction protein expression (occludin), immune cell activation (CD14, CD11b), mucus production, and cytokine release (midkine) in response to stimuli like gluten and lipopolysaccharide.

Main Results:

  • The model successfully replicates a healthy intestinal monolayer, with quantifiable changes observed under inflammatory conditions (e.g., reduced thickness, barrier disruption).
  • Gluten exposure led to decreased occludin expression and immune cell activation, demonstrating the model's sensitivity to food components.
  • Lipopolysaccharide stimulation induced increased mucus staining and cytokine release, validating the model for simulating intestinal inflammation.

Conclusions:

  • The developed 3D intestinal model provides a robust and versatile platform for studying inflammatory status and barrier integrity.
  • The model allows for the analysis of multiple quantifiable visual parameters from fixed tissue sections, enhancing experimental efficiency.
  • This cell-based in vitro system serves as a valuable alternative to animal models for various research applications in intestinal science.