TY - JOUR
T1 - Evaluation of layers of the rat airway epithelial cell line RL-65 for permeability screening of inhaled drug candidates.
AU - Hutter, Victoria
AU - Hilgendorf, Constanze
AU - Cooper, Anne
AU - Zann, Vanessa
AU - Pritchard, David
AU - Bosquillon, Cynthia
PY - 2012/9/29
Y1 - 2012/9/29
N2 - A rat respiratory epithelial cell culture system for in vitro prediction of drug pulmonary absorption is currently lacking. Such a model may however enhance the understanding of interspecies differences in inhaled drug pharmacokinetics by filling the gap between human in vitro and rat in/ex vivo drug permeability screens. The rat airway epithelial cell line RL-65 was cultured on Transwell® inserts for up to 21days at an air-liquid (AL) interface and cell layers were evaluated for their suitability as a drug permeability measurement tool. These layers were found to be morphologically representative of the bronchial/bronchiolar epithelium when cultured for 8days in a defined serum-free medium. In addition, RL-65 layers developed epithelial barrier properties with a transepithelial electrical resistance (TEER) >300Ωcm(2) and apparent (14)C-mannitol permeability (P(app)) values between 0.5-3.0×10(-6)cm/s; i.e., in the same range as established in vitro human bronchial epithelial absorption models. Expression of P-glycoprotein was confirmed by gene analysis and immunohistochemistry. Nevertheless, no vectorial transport of the established substrates (3)H-digoxin and Rhodamine123 was observed across the layers. Although preliminary, this study shows RL-65 cell layers have the potential to become a useful in vitro screening tool in the pre-clinical development of inhaled drug candidates.
AB - A rat respiratory epithelial cell culture system for in vitro prediction of drug pulmonary absorption is currently lacking. Such a model may however enhance the understanding of interspecies differences in inhaled drug pharmacokinetics by filling the gap between human in vitro and rat in/ex vivo drug permeability screens. The rat airway epithelial cell line RL-65 was cultured on Transwell® inserts for up to 21days at an air-liquid (AL) interface and cell layers were evaluated for their suitability as a drug permeability measurement tool. These layers were found to be morphologically representative of the bronchial/bronchiolar epithelium when cultured for 8days in a defined serum-free medium. In addition, RL-65 layers developed epithelial barrier properties with a transepithelial electrical resistance (TEER) >300Ωcm(2) and apparent (14)C-mannitol permeability (P(app)) values between 0.5-3.0×10(-6)cm/s; i.e., in the same range as established in vitro human bronchial epithelial absorption models. Expression of P-glycoprotein was confirmed by gene analysis and immunohistochemistry. Nevertheless, no vectorial transport of the established substrates (3)H-digoxin and Rhodamine123 was observed across the layers. Although preliminary, this study shows RL-65 cell layers have the potential to become a useful in vitro screening tool in the pre-clinical development of inhaled drug candidates.
UR - http://www.scopus.com/inward/record.url?scp=84864496479&partnerID=8YFLogxK
U2 - 10.1016/j.ejps.2012.07.007
DO - 10.1016/j.ejps.2012.07.007
M3 - Article
AN - SCOPUS:84864496479
SN - 0928-0987
VL - 47
SP - 481
EP - 489
JO - European Journal of Pharmaceutical Sciences
JF - European Journal of Pharmaceutical Sciences
IS - 2
ER -