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Development and Characterization of an In Vitro Intestinal Model Including Extracellular Matrix and Macrovascular

Scarlett Zeiringer1, Laura Wiltschko1,2, Christina Glader1,3

  • 1University of Graz, Institute of Pharmaceutical Sciences, Pharmaceutical Technology and Biopharmacy, Universitätsplatz 1, 8010 Graz, Austria.

Molecular Pharmaceutics
|September 7, 2023
PubMed
Summary

This study developed a novel, animal-free in vitro intestinal model using Vitrogel, enhancing cell proliferation and accurately predicting drug permeability for reliable research.

Keywords:
endothelial cellsextracellular matrixhydrogelin vitro intestinal modelsynthetic hydrogel

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Area of Science:

  • Biomedical Engineering
  • Cell Biology
  • Pharmacology

Background:

  • In vitro intestinal models are crucial for studying biological processes and drug absorption, but often rely on animal-derived materials like Matrigel.
  • Animal-derived components can introduce variability and affect experimental outcomes.
  • Existing models often lack crucial components like extracellular matrix (ECM) and vascularization, or inadequately incorporate them.

Purpose of the Study:

  • To develop and characterize a novel, xenofree in vitro intestinal model using synthetic hydrogels.
  • To compare the performance of synthetic hydrogels (Vitrogel, Peptigel) with animal-derived Matrigel as ECM.
  • To evaluate the model's ability to mimic human intestinal epithelium and predict drug permeability.

Main Methods:

  • Rheological characterization of synthetic hydrogels (Vitrogel, Peptigel) and Matrigel.
  • Culturing Caco-2 and HT29-MTX cell cocultures on Vitrogel with simultaneous endothelial cell culture.
  • Assessing cell proliferation, differentiation (alkaline phosphatase release, mucus production), and drug permeability (antipyrine, atenolol).

Main Results:

  • Vitrogel demonstrated favorable rheological properties, including shear-thinning behavior and structural recovery.
  • The Vitrogel-based model showed a 1.7-fold increase in cell proliferation and promoted microvilli and tight junction formation.
  • The model achieved full differentiation and produced comparable drug permeability coefficients (Papp) to ex vivo data.

Conclusions:

  • The developed xenofree in vitro intestinal model using Vitrogel provides a robust platform for drug permeability assessment.
  • This model minimizes animal product-derived variability, leading to more accurate and reproducible results.
  • The model holds potential for efficient and reliable drug screening and development.