Fig. 7. Cav1.2 and caffeine-induced Ca2+ release in WT and PERK-/- urinary bladder smooth muscle cells. (A) WT (black traces and column) and PERK-/- (gray traces and column) cells were used to measure Cav1.2 current. (B) The voltage dependence of Cav1.2 in WT (
) and PERK-/- cells (
). WT (C) and PERK-/- UBSM strips (D) were exposed to caffeine concentrations between 5-40 mM and then depolarized with 80 mM K+ to measure the activity of the RyRs in the UBSM. (E) The average response of four strips from two WT and two PERK-/- mice given as the mean ± s.e.m.