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. 2017 Jun 7;7:2931. doi: 10.1038/s41598-017-03103-2

Figure 4.

Figure 4

Inhibition is inversely proportional to the level of cAMP-mediated activation of CFTR: (a) An example trace shows the graded nature of CFTR channel function where total cellular current increases with increasing IBMX concentration. Maximum current was defined as that which was elicited by 1 mM IBMX + 50 μM FSK. (b) Summary data show the fractional current elicited with each activation condition. (c) Summary traces show the distinct kinetics associated with inhibition of channels by 1 μg/mL SMase following activation with 0.01, 0.1, or 1.0 mM IBMX (n = 4–5). (d) Summary data showing that fractional inhibition at 10 minutes was dependent upon activation condition (p = 0.0003, 1-way ANOVA).