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Highly Biomimetic Ectodermal Epithelial Organoids for Epithelial Barrier Stimulation Assays.

Yiming Chen1, Yuman Li1, Chenyu Deng2

  • 1Department of Geriatric Dentistry, Peking University School and Hospital of Stomatology & National Center of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices & Beijing Key Laboratory of Biomaterials for Oral Disease, Beijing, P. R. China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|March 28, 2026
PubMed
Summary

Researchers developed novel ectodermal epithelial organoids (EEOs) to improve pre-clinical toxicity testing. These organoids accurately model drug and nanomaterial effects on epithelial barriers, enhancing safety assessments.

Keywords:
TGF‐β signaling pathwayectodermal epithelial organoids (EEOs)epithelial barrier stimulation testsintercellular junctionsstratum corneum

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Area of Science:

  • Biomaterials Science
  • Toxicology
  • Regenerative Medicine

Background:

  • Pre-clinical assessment of pharmaceutical and biomaterial toxicity to ectodermal epithelia is crucial but limited by inadequate screening models.
  • Current models lack the physiological relevance and accuracy needed for reliable toxicity evaluation.

Purpose of the Study:

  • To develop a physiologically relevant and accurate screening model for evaluating ectodermal epithelial toxicity.
  • To create novel ectodermal epithelial organoids (EEOs) that recapitulate in vivo tissue complexity and improve fabrication efficiency.

Main Methods:

  • Ectodermal epithelial organoids (EEOs) were fabricated using developmental patterns and downregulation of the TGF-β signaling pathway.
  • EEOs were validated for their ability to model barrier components like the stratum corneum and intercellular junctions.
  • The model's capacity to predict dose-dependent cytotoxicity and nanomaterial-induced damage was assessed.

Main Results:

  • The novel EEOs successfully recapitulated the cellular and histological complexity of native ectodermal epithelia.
  • EEOs accurately captured essential barrier components, including the stratum corneum and intercellular junctions.
  • The organoids effectively modeled dose-dependent pharmaceutical cytotoxicity and identified nanomaterial-induced damage to intercellular junctions.

Conclusions:

  • Ectodermal epithelial organoids (EEOs) provide a robust platform for epithelial barrier stimulation tests.
  • This technology offers a more accurate method for toxicity prediction in pre-clinical assessments.
  • The EEO model has the potential to accelerate the development of safer pharmaceuticals and biomaterials.