ObjectiveTo establish a method of air-liquid interface culture and ciliary beat frequency measurement of mouse tracheal-bronchial epithelial cells to simulate the physiological function of airway epithelium.MethodsBALB/c mouse tracheal-bronchial epithelial cells were obtained by digestion with 1 mg/mL protease in cold temperature overnight, and the digestion time was optimized to ensure the quantity and viability of the obtained cells. After removing fibroblasts by differential velocity adhesion method, the cells were cultured into collagen coated Transwell inserts. Proliferating phase and air-liquid interface culture were promoted with different culture media.ResultsCell numbers obtained by cold protease overnight digestion for 12 h, 14 h and 16 h were (1.78±0.33)×105, (1.93±0.26)×105 and (2.01±0.28)×105, respectively. Cell viability by trypan blue staining were (96.86±0.25)%, (94.73±1.63)% and (86.87±5.95)%, respectively. Cells were 100% confluent in Transwell chamber after 1-week proliferation, and the ciliary beat frequency was observed under microscope after 2 - 3 weeks of air-liquid interface culture. The cilia structure was confirmed by hematoxylin-eosin staining, electron microscopy and immunofluorescence. Ciliary beat frequency of the cells obtained by this method was consistent with that of mouse trachea in vivo, which further demonstrated its capacity in simulating the physiological function of airway epithelium. ConclusionsThe separation and air-liquid interface culture system as well as the ciliary beat frequency measurement method established in this experiment is simple, stable, efficient and reliable, which establishes a substantial foundation for exploring the pathogenesis and treatment mechanism of airway diseases. It can also provide reference for the culture of epithelium in the airway of other species and/or other organs.
