| Assay Method Information | |
| | Chamber Assay of CFTR-mediated short-circuit currents |
| Description: | ssing chamber experiments were performed using human bronchial epithelial (HBE) cells derived from CF subjects heterozygous for F508del and a minimal function CFTR mutation (F508del/MF-HBE) and cultured as previously described (Neuberger T, Burton B, Clark H, Van Goor F Methods Mol Biol 2011:741:39-54). After four days the apical media was removed, and the cells were grown at an air liquid interface for >14 days prior to use. This resulted in a monolayer of fully differentiated columnar cells that were ciliated, features that are characteristic of human bronchial airway epithelia. To isolate the CFTR-mediated short-circuit (ISC) current, F508del/MF-HBE grown on Costar Snapwell cell culture inserts were mounted in an Ussing chamber and the transepithelial ISC was measured under voltage-clamp recording conditions (Vhold= 0 mV) at 37 oC. The basolateral solution contained (in mM) 145 NaCl, 0.83 K2HPO4, 3.3 KH2PO4, 1.2 MgCl2, 1.2 CaCl2, 10 Glucose, 10 HEPES (pH adjusted to 7.4 with NaOH) and the apical solution contained (in mM) 145 NaGluconate, 1.2 MgCl2, 1.2 CaCl2, 10 glucose, 10 HEPES (pH adjusted to 7.4 with NaOH) and 30 µM amiloride to block the epithelial sodium channel. Forskolin (20 µM) was added to the apical surface to activate CFTR, followed by apical addition of a CFTR inhibitor cocktail consisting of BPO, GlyH-101 and CFTR inhibitor 172 (each at 20 µM final assay concentration) to specifically isolate CFTR currents. The CFTR-mediated ISC (µA/cm2) for each condition was determined from the peak forskolin response to the steady-state current following inhibition. |
| Affinity data for this assay | |
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