Knockdown of Wnt2 reversed the effect of miR-221 inhibitor on the proliferation and apoptosis of hippocampal neurons. Hippocampal neurons were divided into NC group, miR-221 inhibitor group, miR-221 inhibitor+si-NC group, and miR-221 inhibitor+si-Wnt2 group. (a) The proliferation of hippocampal neuronal. (b) The apoptosis of hippocampal neuronal. (c) The protein expression of Wnt2, p-CREB and BDNF. **P < 0.01 vs NC, ##P < 0.01 vs miR-221 inhibitor+ si-NC. Hippocampal neurons were divided into NC group, miR-221 mimic group, miR-221 mimic+Lenti-NC group, and miR-221 mimic+Lenti-Wnt2 group. (d) The proliferation of hippocampal neuronal. (e) The apoptosis of hippocampal neuronal. (f) The protein expression of Wnt2, p-CREB and BDNF. **P < 0.01 vs NC, ##P < 0.01 vs miR-221 mimic+Lenti-NC.