[HTML][HTML] Effect of VX-770 (ivacaftor) and OAG on Ca2+ influx and CFTR activity in G551D and F508del-CFTR expressing cells
L Vachel, C Norez, F Becq, C Vandebrouck - Journal of Cystic Fibrosis, 2013 - Elsevier
L Vachel, C Norez, F Becq, C Vandebrouck
Journal of Cystic Fibrosis, 2013•ElsevierBackground 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. Methods 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 …
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. Methods 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 …
Background
TRPC6 has been proposed to be responsible for the abnormal OAG-dependent Ca2 + 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.
Methods
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).
Results
CFTR down regulates OAG Ca2 + response and OAG Ca2 + influx increases CFTR chloride efflux. Furthermore, we observed potentiation of G551D-CFTR activity when combining VX-770 and OAG.
Conclusion
Taking advantage of the functional coupling between OAG-dependent Ca2 + influx and CFTR, a combination of OAG and VX-770 could be a therapeutic strategy for homozygote patients bearing the G551D-CFTR mutation.
Elsevier