Localized synaptic potentiation by BDNF requires local protein synthesis in the developing axon.
Brain-derived neurotrophic factor (BDNF) is known to promote neuronal survival, guide axonal pathfinding, and participate in activity-dependent synaptic plasticity. In Xenopus nerve-muscle cultures, localized contact of a single BDNF-coated bead with the presynaptic axon resulted in potentiation of transmitter secretion at the developing synapses, but only when the bead was placed within 60 microm from the synapse. The localized potentiation induced by BDNF is accompanied by a persistent local elevation of [Ca(2+)](i) in the axon and requires constitutive presynaptic protein translation, even for axons severed from the cell body. Thus, presynaptic local TrkB signaling and protein synthesis allow a localized source of BDNF to potentiate transmitter secretion from nearby synapses, a property suited for spatially restricted synaptic modification by neurotrophins.
Zhang
Xiao hui
Xh
Division of Neurobiology, Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, CA 94720, USA.
Poo
Mu-ming
MM
D000109:Acetylcholine / Q000378:metabolism; D000818:Animals; D019208:Brain-Derived Neurotrophic Factor / Q000378:metabolism* / Q000494:pharmacology; D002118:Calcium / Q000378:metabolism; D020013:Calcium Signaling / Q000187:drug effects / Q000502:physiology; D002454:Cell Differentiation / Q000187:drug effects / Q000502:physiology*; D004625:Embryo, Nonmammalian; D019706:Excitatory Postsynaptic Potentials / Q000187:drug effects / Q000502:physiology; D008863:Microspheres; D009046:Motor Neurons / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D018482:Muscle, Skeletal / Q000196:embryology / Q000294:innervation; D009469:Neuromuscular Junction / Q000166:cytology / Q000187:drug effects / Q000196:embryology*; D017729:Presynaptic Terminals / Q000187:drug effects / Q000378:metabolism* / Q000648:ultrastructure; D020813:Receptor, trkB / Q000037:antagonists & inhibitors / Q000096:biosynthesis*; D009435:Synaptic Transmission / Q000187:drug effects / Q000502:physiology*; D014982:Xenopus laevis
D019208:Brain-Derived Neurotrophic Factor; D020813:Receptor, trkB; D000109:Acetylcholine; D002118:Calcium