Impact of different intratracheal flows during lung decellularization on extracellular matrix composition and mechanics.

Aim: To evaluate different intratracheal flow rates on extracellular matrix content and lung mechanics in an established lung decellularization protocol. Materials & methods: Healthy mice were used: 15 for decellularization and five to serve as controls. Fluids were instilled at 5, 10and 20ml/min flow rates through tracheal cannula and right ventricular cavity (0.5ml/min) in all groups. Results: The 20ml/min rate better preserved collagen content in decellularized lungs. Elastic fiber content decreased at 5 and 10ml/min, but not at 20ml/min, compared with controls. Chondroitin, heparan and dermatan content was reduced after decellularization. Conclusion: An intratracheal flow rate of 20ml/min was associated with lower resistance and greater preservation of collagen to that observed in ex vivo control lungs.