Fig. 5From: Nicotine attenuates the effect of HIV-1 proteins on the neural circuits of working and contextual memoriesRegulation of synaptic plasticity gene expression by nicotine in the hippocampus (a) and amygdala (b) of F344 rats. Moderate chronic dose of nicotine increased expression of genes in the Ca+2/calmodulin-dependent kinase-IV signaling and Raf/Mek/Erk signaling pathways in the hippocampus. However, the same dose of nicotine downregulated the majority of synaptic plasticity genes in the amygdala compared with the F344 saline-treated group. Signaling cascades were drawn by IPABack to article page