FIGURE 6.
Nedd4-1-induced regulation of Cav channels involves the lysosome. A, effect of MDC (100 μm for 15 h) and chloroquine (50 μm for 15 h) on Cav1.2α1/Cavβ2/Cavα2δ-1 current densities recorded in control (white bars) and Nedd4-1-transfected cells (black bars). †, p < 0.05 when compared with Nedd4-1-transfected cells treated with vehicle only; *, p < 0.05 when compared with corresponding control cells. B, surface biotinylation assays were performed in control and Nedd4-1-transfected cells treated with MDC and chloroquine. Western blots (WB) and associated bar graph, in C, show that the treatment failed to prevent the down-regulation of Cav1.2 channels in Nedd4-1-transfected cells. A.U., arbitrary units. The number of independent experiments is indicated in parentheses. **, p < 0.01, ***p < 0.001 when compared with control cells transfected with Cav1.2α1/Cavβ2/Cavα2δ-1 channels only. Biot., biotinylated; WCL, whole-cell lysate.