Bioactive Cell-Derived ECM Scaffold Forms a Unique Cellular Microenvironment for Lung Tissue Engineering.

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Pulmonary Biology

Background:

• Chronic lung diseases cause significant mortality globally.
• Lung transplantation is the sole curative treatment but faces donor limitations.
• Current lung tissue engineering (LTE) strategies are limited in complexity.

Purpose of the Study:

• To develop an extracellular matrix (ECM)-integrated scaffold for lung tissue regeneration.
• To create a biomimetic scaffold that replicates the native lung microenvironment.
• To assess the efficacy of a cellularization-decellularization-recellularization technique for scaffold fabrication.

Main Methods:

• Fabrication of a BETA (biphasic elastic thin for air-liquid interface cell culture conditions) scaffold.
• Initial cell seeding with human lung fibroblasts (IMR90) for ECM deposition.
• Optimized decellularization using NH4OH, Triton X100, and DNase treatment.
• Repopulation of the ECM-integrated scaffold with primary human lung fibroblasts and bronchial epithelial cells.

Main Results:

• The decellularization process successfully removed cells while preserving key ECM proteins (collagen I and IV).
• The ECM-integrated BETA scaffold effectively mimicked the physico-mechanical properties and microenvironment of the native lung ECM.
• The scaffold supported repopulation with both lung fibroblasts and bronchial epithelial cells.

Conclusions:

• The developed ECM-integrated scaffold shows significant potential for lung tissue engineering applications.
• This biomimetic approach offers a promising strategy to overcome limitations in current regenerative medicine for lung diseases.
• The technique provides a more realistic in vitro model of the lung's cellular microenvironment.