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Related Experiment Video

Updated: Nov 7, 2025

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Reversed-engineered human alveolar lung-on-a-chip model.

Di Huang1,2, Tingting Liu1,2,3, Junlong Liao1,4

  • 1Division of Engineering in Medicine, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Cambridge, MA 02139.

Proceedings of the National Academy of Sciences of the United States of America
|May 4, 2021
PubMed
Summary

Researchers developed a lung-on-a-chip model mimicking human pulmonary alveoli. This advanced platform enables in vitro study of lung physiology and diseases like smoking effects and viral infections.

Keywords:
alveolidistal lunginverse opallung-on-a-chipthree-dimensional

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Area of Science:

  • Biomedical Engineering
  • Cell Biology
  • Pulmonary Medicine

Background:

  • The human pulmonary alveoli are complex structures crucial for gas exchange.
  • Existing in vitro models often lack the physiological relevance needed to study lung diseases.
  • A need exists for advanced models that replicate alveolar structure and function.

Purpose of the Study:

  • To develop a physiologically relevant in vitro model of human pulmonary alveoli.
  • To create a lung-on-a-chip platform capable of simulating breathing and disease exposure.
  • To enable detailed investigation of distal lung physiology and pathology.

Main Methods:

  • Fabrication of a 3D porous hydrogel with an inverse opal structure using gelatin methacryloyl.
  • Integration of the hydrogel into a compartmentalized polydimethylsiloxane chip.
  • Seeding with primary human alveolar epithelial cells and application of cyclic strain for biomimetic breathing.

Main Results:

  • The inverse opal hydrogel successfully mimicked the interconnected pores of human alveolar sacs.
  • Functional epithelial monolayers were formed on the chip.
  • The platform supported biomimetic breathing and allowed for the investigation of pathological effects.

Conclusions:

  • A novel in vitro model of functional human pulmonary alveoli was successfully created.
  • This lung-on-a-chip platform offers a unique tool for studying lung physiology and diseases.
  • The model is expected to advance research into human distal lung conditions and responses.