BDNF and depressive disorder: In summary, we found that CUMS induced rats to display a depression state, and treatment with AS extracts exerted an antidepressant-like effect by activating the BDNF signaling pathway (BDNF-ERK 1/2-CREB) and upregulating the protein expression level of hippocampal BDNF and phosphorylated ERK 1/2 and CREB.