Figure 9.
Inhibition of forskolin- and calyculin A-stimulated CFTR activity by genistein in cell-attached modes. (A) When first applied to the external bath solution, 100 μM genistein enhanced CFTR activity, but after several minutes of application activity declined, suggesting a rate-limiting diffusion. This decline in CFTR activity was reversible after the start of washout of genistein. (B) Time course of genistein's inhibitory effect. Each 1-min trace is from a continuous recording from a Hi-5 cell prestimulated with 10 μM forskolin and 20 nM calyculin A. Recordings were made at various times after the start of genistein (100 μM) perfusion.