A-D Graphs depicting the effects of sub-chronic restraint stress (RST), fluoxetine treatment without stress (FLX), and fluoxetine treatment with stress (RST+FLX) on gene expression in the ILmPFC. Values are percentage means (±SEM) relative to unhandled controls (dashed horizontal line at 100%). Sub-chronic restraint stress reduced the transcript levels for the plasma membrane neurotrophin receptor genes ntrk2 and ntrk3 (A). Note, chronic fluoxetine treatment prevented the stress-induced ntrk2 but not ntrk3 transcript reduction. Sub-chronic restraint stress reduced transcript levels for the PI3K-AKT1-GSK3B (B) and NTRK2-MAPK/ERK (C) but not the PLCγ1 (D) intracellular signalling pathways. Interestingly, fluoxetine treatment prevented the sub-chronic stress-induced reduction in PI3K-AKT1-GSK3B signalling pathway, but not the NTRK2-MAPK/ERK (B-Raf and MAPK1 genes) pathway. Gene expression of the serine-threonine kinase, mTOR, a downstream target of the PI3K-AKT1 pathway, was reduced by sub-chronic stress, an effect not prevented by fluoxetine (D). * denotes p < 0.05.