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Alveoli and Alveolar Ducts

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The respiratory zone of the human body, which stands in contrast to the conducting zone, comprises the structures that actively participate in the exchange of gases. The initiation of this zone is marked by the terminal bronchioles converging into respiratory bronchioles, the tiniest bronchiole classification. The respiratory bronchioles give way to the alveolar ducts that opens into a congregation of alveoli. Actively involved in gas exchange, alveoli resemble tiny sacs similar to clusters of...

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Related Experiment Video

Updated: Aug 1, 2025

Imaging-Guided Bioreactor for Generating Bioengineered Airway Tissue

Imaging-Guided Bioreactor for Generating Bioengineered Airway Tissue

Published on: April 6, 2022

Rational engineering of lung alveolar epithelium.

Katherine L Leiby^1,2, Yifan Yuan³, Ronald Ng¹

¹Department of Biomedical Engineering, Yale University, New Haven, CT, USA.

NPJ Regenerative Medicine

|April 28, 2023

Summary

This summary is machine-generated.

Researchers engineered functional lung tissue by guiding alveolar epithelial cell regeneration within decellularized scaffolds. This breakthrough offers hope for treating end-stage lung disease.

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Procedure for Lung Engineering

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Engineered Lung Tissues Prepared from Decellularized Lung Slices

Engineered Lung Tissues Prepared from Decellularized Lung Slices

Published on: January 21, 2022

Area of Science:

Regenerative Medicine
Tissue Engineering
Pulmonary Biology

Background:

Engineered whole lungs hold promise for end-stage lung disease treatment.
Current limitations in lung regeneration stem from the inability to create mature, functional alveolar epithelium.
Regenerating complex lung structures requires understanding and manipulating the alveolar microenvironment.

Purpose of the Study:

To engineer a functional alveolar epithelium within decellularized lung scaffolds.
To investigate the role of cellular, biochemical, and mechanical cues in alveolar epithelial regeneration.
To guide alveolar epithelial type 2 cells (AEC2s) towards differentiation into type 1 (AEC1s) and type 2 cells.

Main Methods:

Utilizing decellularized lung scaffolds as a base for tissue engineering.
Co-culturing endothelial cells and fibroblasts with soluble growth factors to promote AEC2 seeding.
Modulating Wnt and FGF signaling pathways and applying mechanical strain to induce AEC2 differentiation.
Employing in situ culture techniques to observe alveolar regeneration.

Main Results:

Successfully populated decellularized scaffolds with surfactant-secreting AEC2s through coordinated cellular and biochemical signaling.
Demonstrated AEC2 differentiation into AEC1s by withdrawing Wnt/FGF stimulation and applying mechanical strain.
Engineered epithelial-mesenchymal-endothelial alveolar-like units, recapitulating key lung structures.
Highlighted the critical interplay of niche components in alveolar regeneration.

Conclusions:

A rational strategy for engineering alveolar epithelium comprising AEC2s and AEC1s has been developed.
The study underscores the importance of a multi-modal approach, integrating cellular, biochemical, and mechanical factors for successful lung regeneration.
This work provides a foundation for developing advanced therapeutic options for lung diseases.