p75NTR known as a cell surface receptor for NGF, BDNF, NT-3 and NT-4, is also a receptor for b-amyloid, and for the myelin axon repellant protein MAG.1,2,4,6 Binding of neurotrophins induces receptor dimerization followed by phosphorylation of receptor kinase residues and recruitment of intracellular proteins involved in signal transduction.
