Abstract
P-glycoprotein (P-gp) is expressed in normal tissues with barrier functions where it participates in cell defence mechanisms (Huls, M. et al. J Pharm Exp Ther 2009; 328:3-9). Its presence in the bronchial epithelium and role in the lung protection against inhaled toxicants has yet to be elucidated.
The human bronchial epithelial cell line Calu-3 and normal human bronchial epithelial (NHBE) cells were cultured at an air-liquid interface on Transwell® inserts for 21 days. P-gp expression was evaluated by quantitative polymerase chain reaction and its functionality was assessed by permeability measurements using the established substrate 3H-digoxin either alone or in the presence of chemical or biomolecular inhibitors.
P-gp was absent in NHBE cells and moderately expressed in Calu-3 cells. Net secretory transport of 3H-digoxin was observed in both models. This was reduced at 4°C and in the presence of the selective but non specific P-gp inhibitor PSC833 and the multidrug resistance protein (MRP) inhibitor MK571. The P-gp specific antibody inhibitor UIC2 and the metabolic inhibitors sodium azide and sodium dichloroacetate had no effect on 3H-digoxin transport in Calu-3 cells.
The presence of active transport mechanisms in cultures of human bronchial epithelial cells was demonstrated, although they differed between the models tested. P-gp was not detected in NHBE cells, in line with observed low gene expression in human lung tissue (Bleasby, K. et al. Xenobiotica 2006; 36:963-988). The involvement of P-gp could not be confirmed and the transporter(s) responsible for 3H-digoxin asymmetric broncho-epithelial permeability remain(s) to be identified.
The human bronchial epithelial cell line Calu-3 and normal human bronchial epithelial (NHBE) cells were cultured at an air-liquid interface on Transwell® inserts for 21 days. P-gp expression was evaluated by quantitative polymerase chain reaction and its functionality was assessed by permeability measurements using the established substrate 3H-digoxin either alone or in the presence of chemical or biomolecular inhibitors.
P-gp was absent in NHBE cells and moderately expressed in Calu-3 cells. Net secretory transport of 3H-digoxin was observed in both models. This was reduced at 4°C and in the presence of the selective but non specific P-gp inhibitor PSC833 and the multidrug resistance protein (MRP) inhibitor MK571. The P-gp specific antibody inhibitor UIC2 and the metabolic inhibitors sodium azide and sodium dichloroacetate had no effect on 3H-digoxin transport in Calu-3 cells.
The presence of active transport mechanisms in cultures of human bronchial epithelial cells was demonstrated, although they differed between the models tested. P-gp was not detected in NHBE cells, in line with observed low gene expression in human lung tissue (Bleasby, K. et al. Xenobiotica 2006; 36:963-988). The involvement of P-gp could not be confirmed and the transporter(s) responsible for 3H-digoxin asymmetric broncho-epithelial permeability remain(s) to be identified.
| Original language | English |
|---|---|
| Article number | P843 |
| Pages (from-to) | 142 |
| Journal | European Respiratory Journal |
| Volume | 38 |
| Issue number | Supp 55 |
| Publication status | Published - Sept 2011 |
| Event | ERS - Amsterdam, Netherlands Duration: 24 Sept 2011 → 28 Sept 2011 |