Plasticity of visual cortex related to chromatin acetylation. 1 “Long-term fluoxetine treatment promoted a transient increase of Bdnf expression in the visual cortex, which was paralleled by an increased histone acetylation status at Bdnf promoter regions and by decreased expression of Hdac5. Accordingly, enhancing histone acetylation levels by systemic treatment with Trichostatin-A reactivated plasticity in the adult while WAY-100635-infusion prevented epigenetic modifications in Bdnf promoter areas. The data suggest a key role for 5-HT(1A) receptor and BDNF-trkB signalling in driving a transitory epigenetic remodelling of chromatin structure that underlies the reactivation of plasticity in the visual system.” 2