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Physiological 3D Tissue Model of the Airway Wall and Mucosa

This protocol provides instructions for creating a physiological 3D tissue model of the airway wall and mucosa using fetal human lung fibroblasts (HLFs) and normal human bronchial epithelial cells (NHBEs) in a transwell system. The model can be used to study airway physiological processes and disease mechanisms.

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Physiological 3D Tissue Model of the Airway Wall and Mucosa

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  1. Physiological 3D Tissue Model of the Airway Wall and Mucosa Melanie M. Choe Alice A. Tomei Melody A. Swartz Press return to continue

  2. Cells & reagents needed for 6 models • PBS • trypsin for HLFs • trypsin for NHBE • co-culture media • hemacytometer • 6 well transwell plate • at least 12 ml collagen solution (7.25 < pH < 7.3) • 6 porous PE cylindrical inserts (acid treated to make hydrophilic) Fetal human lung fibroblasts (HLFs) 70% confluent 4 x T175 Normal human bronchial epithelial cells (NHBEs) 70% confluent 2 x T175 Press return to continue

  3. 1. Harvest fibroblasts (> 6*106 cells) 2. Dissociate pellet in 1 ml co-culture medium 4. Mix well by gently pipetting up and down Avoid bubbles 3. Add collagen and co-culture medium to make a final solution of 500,000 cells /ml and 2.5 mg/ml collagen >12 ml 1 ml Press return to continue

  4. Pipette 100 µl HLF suspension in collagen into each insert to create a plug Place the PE constructs into each transwell insert Incubate (37°C, 5% CO2) 5 min Press return to continue

  5. Pipette the HLF-collagen suspension to completely fill insert (~2 ml/insert) Avoid bubbles • Incubate • (37°C, 5% CO2) • 15 min (collagen turns opaque upon gelation) Press return to continue

  6. Coat the top of collagen gel with a thin layer of acellular collagen (2.5 mg/ml) Avoid bubbles Press return to continue

  7. Gently level the surface of the gel with a cell scraper Incubate (37°C, 5% CO2) 5 min Press return to continue

  8. Aspirate excess fluid from the bottom of the well Press return to continue

  9. Gently pipette 2 ml medium to the bottom chamber Incubate (37°C, 5% CO2) Press return to continue

  10. PAUSE POINT The model can be stored in the incubator for several hours Press return to continue

  11. 1 ml 1. Harvest NHBE 2. Dissociate pellet in 1 ml co-culture medium Press return to continue

  12. Pipet 500,000 NHBE cells (200 µl) onto each PE well Incubate (37°C, 5% CO2) 2 hours Press return to continue

  13. Every ~20 minutes, examine the wells to ensure the top surface is covered by medium (otherwise pipet extra medium, ~100µl) Incubate (37°C, 5% CO2) Press return to continue

  14. After 2 hours, add medium to cover the surface and submerge the model Incubate (37°C, 5% CO2) Culture in submersion for at least 7 days Refresh medium every 2 days Press return to continue

  15. Check every few days under phase contrast to determine when epithelium is confluent Press return to continue

  16. When the epithelium is confluent, create air-liquid interface (ALI) Aspirate the medium Press return to continue

  17. Wash the epithelial surface with warm PBS (~500µl) gently (not directly on the cells) Aspirate the PBS Press return to continue

  18. Change medium in the bottom well daily (maintain level for ALI) Wash epithelial surface with PBS daily Culture in air liquid interface for at least 7 days (21 days of optimal epithelial differentiation) END

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