vx-770 and 1-oleoyl-2-acetoyl-sn-glycerol

TRPC6 has been proposed to be responsible for the abnormal OAG-dependent Ca(2+) influx in cystic fibrosis (CF) cells and we hypothesized that it interacts with CFTR. Here, we investigated how this functional complex operates in CF and non-CF epithelial cells.. Chinese hamster ovary (CHO) cells stably transfected with pNut vector containing wild type CFTR (CHO-WT), F508del-CFTR (CHO-F508del) or G551D-CFTR(CHO-G551D) were used. Calcium channel activity was recorded using Fluo-4 probe and CFTR activity was measured by iodide efflux technique in the presence of CFTR activators (forskolin, genistein) and VX-770, CFTR inhibitor (GPinh5a) and TRPC non-selective modulators (OAG, SKF96365).. CFTR down regulates OAG Ca(2+) response and OAG Ca(2+) influx increases CFTR chloride efflux. Furthermore, we observed potentiation of G551D-CFTR activity when combining VX-770 and OAG.. Taking advantage of the functional coupling between OAG-dependent Ca(2+) influx and CFTR, a combination of OAG and VX-770 could be a therapeutic strategy for homozygote patients bearing the G551D-CFTR mutation.

Topics: Aminophenols; Animals; Calcium; CHO Cells; Cricetulus; Cystic Fibrosis Transmembrane Conductance Regulator; Diglycerides; Ion Channel Gating; Membrane Potentials; Membrane Transport Modulators; Quinolones; Transfection; TRPC Cation Channels