Revascularization of decellularized lung scaffolds: principles and progress

Area of Science:

• Biotechnology and Regenerative Medicine
• Pulmonary Medicine
• Biomaterials Science

Background:

• Significant unmet need exists for lung repair and replacement strategies beyond transplantation.
• Decellularization of whole lungs yields extracellular matrix scaffolds for tissue engineering.
• Current bioengineered lung models show limited long-term vascular functionality and integrity.

Purpose of the Study:

• To review critical factors for successful whole lung bioengineering.
• To highlight the importance of preserving scaffold integrity and endothelial function.
• To advance the clinical translation of next-generation bioengineered lungs.

Main Methods:

• Review of current literature on lung decellularization and recellularization techniques.
• Analysis of preclinical studies on bioengineered lung implantation and outcomes.
• Exploration of strategies to restore vascular integrity and endothelial quiescence.

Main Results:

• Preclinical models demonstrate short-term gas exchange in bioengineered lungs.
• Hemorrhage and thrombosis indicate failure to establish a functional endothelium.
• Scaffold integrity and endothelial restoration are key limitations.

Conclusions:

• Successful whole lung bioengineering requires preserving subendothelial basement membrane integrity.
• Restoring a quiescent and functional endothelial lining is crucial for vascular reconstitution.
• Addressing these challenges will promote clinical translation of bioengineered lungs.