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Barrier functions measured by transepithelial resistance (a) and permeability for FITC-labelled dextran 4.4 kDa (b) of RPMI 2650 layers treated with retinoic acid (RA, 300 μg/mL), hydrocortisone (HC, 500 nM) or 3′–5′-cyclic adenosine monophosphate (cAMP, 250 μM). Papp, apparent permeability coefficient. Control conditions: RPMI 2650 cells were grown in Eagle’s minimal essential medium supplemented with 10 % foetal bovine serum and 50 μg/mL gentamicin
