Human Bronchial Epithelial Cell Growth on Homologous Versus Heterologous Tissue Extracellular Matrix

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Tissue Engineering

Background:

• Decellularized extracellular matrix (ECM) bioscaffolds are used clinically, but tracheal constructs fail due to the need for functional airway epithelium.
• ECM can be solubilized into hydrogels supporting diverse cell types.

Purpose of the Study:

• To compare airway epithelial cell attachment, monolayer formation, and differentiation on homologous (trachea) and heterologous (urinary bladder) ECM substrates.
• To evaluate potential applications in full tracheal replacement.

Main Methods:

• Porcine tracheas and urinary bladders were decellularized to create bioscaffolds and hydrogels.
• Human bronchial epithelial cells (HBECs) were cultured on these substrates under differentiation conditions.
• Histology and immunolabeling assessed ciliation, goblet cell formation, and basement membrane deposition.

Main Results:

• Both tracheal and urinary bladder tissues were successfully decellularized.
• HBECs formed confluent layers on both scaffolds and hydrogels.
• Cells on ECM hydrogels, but not bioscaffolds, exhibited ciliation and goblet cell formation, with basement membrane deposition.

Conclusions:

• ECM hydrogels support human bronchial epithelial cell growth and differentiation more effectively than decellularized ECM bioscaffolds.
• ECM hydrogels show potential as substrates for developing mature respiratory epithelium for tracheal regenerative medicine.