TrkB Protein, Rat (HEK293, C-His)

TrkB, a receptor tyrosine kinase, intricately orchestrates the development and maturation of both the central and peripheral nervous systems, exerting regulatory control over various neuronal processes, including survival, proliferation, migration, differentiation, and synapse formation. Functioning as a receptor for BDNF/brain-derived neurotrophic factor and NTF4/neurotrophin-4, it can alternatively bind NTF3/neurotrophin-3, modulating neuron survival through NTRK2. Upon ligand binding, TrkB undergoes homodimerization, autophosphorylation, and activation, initiating a cascade of downstream events. It recruits, phosphorylates, and activates diverse effectors such as SHC1, FRS2, SH2B1, SH2B2, and PLCG1, which coordinate distinct signaling pathways, including the GRB2-Ras-MAPK cascade for neuronal differentiation, the Ras-PI3 kinase-AKT1 pathway for growth and survival, and PLCG1-regulated pathways for synaptic plasticity. TrkB's involvement in learning and memory encompasses the regulation of short-term synaptic function and long-term potentiation. Additionally, through PLCG1, it activates NF-Kappa-B and transcription of survival-related genes, enabling the suppression of anoikis—a form of apoptosis resulting from the loss of cell-matrix interactions. Notably, TrkB may also contribute to neurotrophin-dependent calcium signaling in glial cells.