(a) PI3K pathway regulates trafficking and PSD-95 to a synapse and cAMP regulates formation of synaptic PSD-95-TrkB complex.
(b) BDNF-TrkB signaling activates MAPK/Erk, increasese cAMP and activate CREB-regulated gene transcription.
(c) BDNF-TrkB signaling regulates protein translation through both MAPK/Erk and PI3K-Akt-mTOR pathways. PI3K-Akt also regulates protein trafficking in ER and Golgi.
(d) A diagram showing BDNF-TrkB signaling regulates multiple molecular events through three pathways in parallel.