Rhynchophylline downregulates phosphorylated camp response element binding protein, nuclear receptor-related-1, and brain-derived neurotrophic factor expression in the hippocampus of ketamine-induced conditioned place preference rats Guo Y, Luo C, Tu G, Li C, Liu Y, Liu W, et al.. Rhynchophylline downregulates phosphorylated camp response element binding protein, nuclear receptor-related-1, and brain-derived neurotrophic factor expression in the hippocampus of ketamine-induced conditioned place preference rats. Pharmacognosy Magazine. 2018;14(53):81-86.