All-Inkjet-Printed 3D Alveolar Barrier Model with Physiologically Relevant Microarchitecture.

Area of Science:

• Biomedical Engineering
• Tissue Engineering
• Respiratory Medicine

Background:

• Physiologically relevant models of the human respiratory system are crucial for studying pulmonary diseases and drug development.
• Existing models often fail to fully recapitulate the complex structure and function of lung tissue.

Purpose of the Study:

• To develop and characterize a 3D alveolar barrier model using inkjet printing technology.
• To evaluate the model's ability to mimic human lung tissue structure, function, and response to viral infection.

Main Methods:

• Fabrication of a three-layered alveolar barrier model using drop-on-demand inkjet printing.
• Incorporation of four human cell lines: type I and II alveolar cells (NCI-H1703, NCI-H441), lung fibroblasts (MRC5), and lung microvascular endothelial cells (HULEC-5a).
• Comparison of the 3D model with 2D cell culture and non-structured 3D models.

Main Results:

• The 3D inkjet-printed model achieved an unprecedented thickness of approximately 10 µm.
• The structured 3D model demonstrated superior recapitulation of lung tissue structure, morphology, and function compared to 2D and non-structured 3D models.
• The model successfully reproduced tissue-level responses to influenza infection.

Conclusions:

• Inkjet printing is a viable technology for creating standardized, scalable 3D alveolar barrier models.
• This thin, multilayered 3D model serves as a promising alternative to traditional testing models for pathological and pharmaceutical applications.
• The developed model enhances the study of respiratory diseases and therapeutic interventions.