WNT5a down-regulates canonical WNT signaling and CREB expression in GCs in vitro. Primary cultured GCs were treated or not with WNT5a (3.5 μg/ml) for the indicated times, and the expression of the indicated proteins and phosphoproteins was studied by immunoblot analysis. Representative immunoblots show 2 samples/treatment and time, with quantitative analyses of 4 samples/treatment and time. Values for the WNT5a-treated groups are expressed relative to their corresponding controls at each time point. ▪, control; □, WNT5a treatment. Data are means ± sem. *P < 0.05, **P < 0.01, and ***P < 0.001, effect of WNT5a treatment vs. control.