Figure 2.
Effects of CFTRinh-172 on the open time of WT-CFTR. (A and B) Single-channel traces showing a reversible decrease of the open time in the presence of CFTRinh-172 for (A) ATP- and (B) P-ATP–gated channels. Dashed lines represent the current level of the closed state. (C) The mean open time (τo) decrease as a result of 5 µM CFTRinh-172 for channels opened with ATP (n = 10) or P-ATP (n = 7). The mean closed time (τc) was prolonged by CFTRinh-172 (τc = 637.3 ± 59.2 ms in the absence of CFTRinh-172 and 2,580.5 ± 623.4 ms in the presence of 5 µM CFTRinh-172). For channels opened with P-ATP, τc = 670.8 ± 55.8 ms and 2,058.3 ± 254.2 ms in the absence and presence of CFTRinh-172, respectively.