Knockdown of Scratch2 in rat vPAG results in depression-like behaviors. (A and B) The mRNA level of Scratch2 (A) or GalR1 (B) was determined by real-time PCR in the vPAG after the injection of Lenti-Scratch2-siRNA virus. Data are presented as mean ± SD (n = 3 per group). In A, T14 = 3.171, P < 0.05. In B, T14 = 2.807, P < 0.05. (C) Decreased sucrose intake in the sucrose preference test was observed after injection of Lenti-Scratch2-siRNA virus. One-way ANOVA, F(2, 21) = 10.01, P < 0.001. (D) Increased immobility time in the FST was induced after injection of Lenti-Scratch2-siRNA virus. One-way ANOVA, F(2, 21) = 6.387, P < 0.01. (E and F) Decreased central area time (E) and total distance (F) in the OFT was observed after injection of Lenti-Scratch2-siRNA virus. In E, One-way ANOVA, F(2, 21) = 9.776, P < 0.001. In F, One-way ANOVA, F(2, 21) = 12.81, P < 0.001. Data are presented as mean ± SE (n = 8 per group). *P < 0.05, **P < 0.01.