Researchers Develop Bioprinted Airway Scaffolds Using Tissue-Derived Materials for Potential Disease Treatment
Scientists have created biocompatible bioinks derived from decellularized human airway tissue that can be 3D-printed into hollow, structurally accurate proximal airway scaffolds. The optimal formulation combines airway-derived extracellular matrix with alginate and RGD-conjugated nanofibrillar cellulose, achieving mechanical stiffness (~8–10 kPa) comparable to native airway tissue. The advance could improve treatment options for patients with end-stage airway disease or congenital airway defects.
A new study published on bioRxiv describes the development of tissue-specific bioinks made from decellularized human airway extracellular matrix (AW-dECM) blended with alginate and RGD-conjugated nanofibrillar cellulose (Cellink-RGD) for use in 3D bioprinting of proximal airway constructs. The researchers identified an optimal concentration of 30 mg/mL AW-dECM that enables printing of both simple and complex hollow airway geometries while matching the viscoelastic and stiffness properties of native airway tissue at approximately 8–10 kPa. In vitro experiments showed that primary human airway epithelial cells cultured on these bioinks for 28 days at an air-liquid interface successfully differentiated into mucociliary and secretory cell phenotypes, indicating strong biocompatibility. In vivo testing via subcutaneous implantation in immunocompetent rats over 30 days confirmed biodegradative stability with no signs of infection or necrosis. The study positions this bioink platform as a foundation for both physiologically relevant airway disease models and potential clinical tissue engineering applications, with tunable mechanical properties designed to support airway stem cell growth and differentiation.
What's missing
As a preprint, this work has not yet undergone peer review. Key limitations include the absence of vascularization strategies for thicker constructs and the lack of functional airway testing (e.g., mucociliary clearance assays or airflow mechanics) in the printed scaffolds. Long-term in vivo performance and scalability of human-derived dECM sourcing for clinical translation also remain open questions.
What different sources said
- bioRxivCenter
Recreating the Native Airway Microenvironment Using Tissue-Specific Extracellular Matrix Bioinks for Proximal Airway Engineering
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