Abstract:
:Brain-derived neurotrophic factor (BDNF) can potentiate synaptic release at newly developed frog neuromuscular junctions. Although this potentiation depends on extracellular Ca(2+) and reflects changes in acetylcholine release, little is known about the intracellular transduction or calcium signaling pathways. We have developed a video assay for neurotrophin-induced potentiation of myocyte twitching as a measure of potentiation of synaptic activity. We use this assay to show that BDNF-induced synaptic potentiation is not blocked by cadmium, indicating that Ca(2+) influx through voltage-gated Ca(2+) channels is not required. TrkB autophosphorylation is not blocked in Ca(2+)-free conditions, indicating that TrkB activity is not Ca(2+) dependent. Additionally, an inhibitor of phospholipase C interferes with BDNF-induced potentiation. These results suggest that activation of the TrkB receptor activates phospholipase C to initiate intracellular Ca(2+) release from stores which subsequently potentiates transmitter release.
journal_name
J Neurophysioljournal_title
Journal of neurophysiologyauthors
Kleiman RJ,Tian N,Krizaj D,Hwang TN,Copenhagen DR,Reichardt LFdoi
10.1152/jn.2000.84.1.472subject
Has Abstractpub_date
2000-07-01 00:00:00pages
472-83issue
1eissn
0022-3077issn
1522-1598journal_volume
84pub_type
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