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• W1763513358 abstract "Abstract Cystic fibrosis ( CF ), the most common recessive autosomal disease among Caucasians, is caused by mutations in the gene encoding the CF transmembrane conductance regulator ( CFTR ) protein. The most common mutation, F508del, leads to CFTR impaired plasma membrane trafficking. Therapies modulating CFTR basic defect are emerging, such as VX ‐809, a corrector of F508del‐ CFTR traffic which just succeeded in a Phase III clinical trial. We recently showed that VX ‐809 is additive to two other correctors ( VRT ‐325 and compound 4a). Here, we aimed to determine whether the differential rescuing by these compounds results from cell‐specific factors or rather from distinct effects at the early biogenesis and/or processing. The rescuing efficiencies of the above three correctors were first compared in different cellular models (primary respiratory cells, cystic fibrosis bronchial epithelial and baby hamster kidney [ BHK ] cell lines) by functional approaches: micro‐Ussing chamber and iodide efflux. Next, biochemical methods (metabolic labeling, pulse‐chase and immunoprecipitation) were used to determine their impact on CFTR biogenesis / processing. Functional analyses revealed that VX ‐809 has the greatest rescuing efficacy and that the relative efficiencies of the three compounds are essentially maintained in all three cellular models tested. Nevertheless, biochemical data show that VX ‐809 significantly stabilizes F508del‐ CFTR immature form, an effect that is not observed for C3 nor C4. VX ‐809 and C3 also significantly increase accumulation of immature CFTR . Our data suggest that VX ‐809 increases the stability of F508del‐ CFTR immature form at an early phase of its biogenesis, thus explaining its increased efficacy when inducing its rescue." @default.
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• W1763513358 date "2015-06-11" @default.
• W1763513358 modified "2023-10-16" @default.
• W1763513358 title "Increased efficacy of <scp>VX</scp> ‐809 in different cellular systems results from an early stabilization effect of F508del‐ <scp>CFTR</scp>" @default.
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• W1763513358 doi "https://doi.org/10.1002/prp2.152" @default.
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