Representative Western blots and quantitative analyses on cytosolic (A) and on nuclear (B) cell lysates. In Pkhd1del4/del4 cholangiocytes, but not in WT or PC-KO, forskolin (F) augmented the expression of p675-β-catenin. Treatment with the Rac-1 inhibitor, NSC 23766 (NSC), significantly blocked the expression of p675-β-catenin in the nuclear fraction. (n=4, *p<0.05 vs untreated cells (C); ○p<0.05 vs forskolin)