title: Activity- and Ca(2+)-dependent modulation of surface expression of brain-derived neurotrophic factor receptors in hippocampal neurons.
abstract: Brain-derived neurotrophic factor (BDNF) has been shown to regulate neuronal survival and synaptic plasticity in the central nervous system (CNS) in an activity-dependent manner, but the underlying mechanisms remain unclear. Here we report that the number of BDNF receptor TrkB on the surface of hippocampal neurons can be enhanced by high frequency neuronal activity and synaptic transmission, and this effect is mediated by Ca(2+) influx. Using membrane protein biotinylation as well as receptor binding assays, we show that field electric stimulation increased the number of TrkB on the surface of cultured hippocampal neurons. Immunofluorescence staining suggests that the electric stimulation facilitated the movement of TrkB from intracellular pool to the cell surface, particularly on neuronal processes. The number of surface TrkB was regulated only by high frequency tetanic stimulation, but not by low frequency stimulation. The activity dependent modulation appears to require Ca(2+) influx, since treatment of the neurons with blockers of voltage-gated Ca(2+) channels or NMDA receptors, or removal of extracellular Ca(2+), severely attenuated the effect of electric stimulation. Moreover, inhibition of Ca(2+)/calmodulin-dependent kinase II (CaMKII) significantly reduced the effectiveness of the tetanic stimulation. These findings may help us to understand the role of neuronal activity in neurotrophin function and the mechanism for receptor tyrosine kinase signaling.
authors.affiliation: Unit on Synapse Development and Plasticity, Laboratory of Developmental Neurobiology, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland 20892-4480, USA.
authors.forename: J
authors.initials: J
authors.lastname: Du
authors.forename: L
authors.initials: L
authors.lastname: Feng
authors.forename: F
authors.initials: F
authors.lastname: Yang
authors.forename: B
authors.initials: B
authors.lastname: Lu
mesh_terms: D018750:6-Cyano-7-nitroquinoxaline-2,3-dione / Q000494:pharmacology; D000595:Amino Acid Sequence; D000818:Animals; D051943:Antennapedia Homeodomain Protein; D019208:Brain-Derived Neurotrophic Factor / Q000378:metabolism / Q000494:pharmacology; D002118:Calcium / Q000378:metabolism*; D054732:Calcium-Calmodulin-Dependent Protein Kinase Type 2; D017871:Calcium-Calmodulin-Dependent Protein Kinases / Q000378:metabolism; D002478:Cells, Cultured; D016291:Dizocilpine Maleate / Q000494:pharmacology; D004558:Electric Stimulation; D018691:Excitatory Amino Acid Antagonists / Q000494:pharmacology; D005455:Fluorescent Antibody Technique; D006624:Hippocampus / Q000166:cytology; D018398:Homeodomain Proteins / Q000235:genetics / Q000378:metabolism; D007457:Iodine Radioisotopes; D008564:Membrane Potentials / Q000187:drug effects / Q000502:physiology; D008565:Membrane Proteins / Q000032:analysis / Q000378:metabolism; D008969:Molecular Sequence Data; D009474:Neurons / Q000737:chemistry / Q000166:cytology / Q000378:metabolism*; D009687:Nuclear Proteins; D011869:Radioligand Assay; D051381:Rats; D020813:Receptor, trkB / Q000032:analysis / Q000378:metabolism*; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D015398:Signal Transduction / Q000502:physiology; D013569:Synapses / Q000201:enzymology; D009435:Synaptic Transmission / Q000502:physiology*; D014157:Transcription Factors
chemical_list: D051943:Antennapedia Homeodomain Protein; D019208:Brain-Derived Neurotrophic Factor; D018691:Excitatory Amino Acid Antagonists; D018398:Homeodomain Proteins; D007457:Iodine Radioisotopes; D008565:Membrane Proteins; D009687:Nuclear Proteins; D011993:Recombinant Fusion Proteins; D014157:Transcription Factors; D016291:Dizocilpine Maleate; D018750:6-Cyano-7-nitroquinoxaline-2,3-dione; D020813:Receptor, trkB; D054732:Calcium-Calmodulin-Dependent Protein Kinase Type 2; D017871:Calcium-Calmodulin-Dependent Protein Kinases; D002118:Calcium