Targeted Preconditioning and Cell Transplantation in the Murine Lower Respiratory Tract

Area of Science:

• Regenerative Medicine
• Stem Cell Biology
• Pulmonary Medicine

Background:

• Airway basal stem cell transplantation shows promise for treating genetic airway diseases like cystic fibrosis.
• Previous studies demonstrated successful engraftment of stem cells in mouse tracheas.
• Translating these therapies to humans requires safe and efficient delivery methods for larger animal models.

Purpose of the Study:

• To develop and evaluate a bronchoscopic preconditioning and cell-delivery model for intrapulmonary airways.
• To assess the efficacy of polidocanol for distal lung preconditioning and airway epithelial denudation.
• To determine the engraftment and differentiation potential of transplanted basal stem cells in intrapulmonary airways.

Main Methods:

• Utilized a micro-bronchoscope for targeted delivery of cells to intrapulmonary airways.
• Adapted the detergent polidocanol for distal lung preconditioning, inducing airway epithelial denudation.
• Delivered both primary and pluripotent stem cell (PSC)-derived basal cells post-injury.
• Monitored airway re-epithelialization and cell engraftment in a preclinical model.

Main Results:

• Polidocanol successfully induced airway epithelial denudation within 5-24 hours.
• Complete airway repair was observed within 7 days post-treatment.
• Transplanted basal cells (both primary and PSC-derived) successfully engrafted in tracheas and intrapulmonary airways.
• Engrafted cells differentiated into ciliated and secretory lineages, maintaining a basal cell population.

Conclusions:

• Bronchoscopic targeting of preconditioning and cell delivery is effective for conducting intrapulmonary airways.
• This approach provides a viable framework for pre-clinical translation of engineered airway epithelial regeneration.
• The study supports the potential of stem cell transplantation for durable cures of genetic airway diseases.