Abstract
We examined enhancement of synaptic transmission by neurotrophins at the presynaptic level. In a synaptosomal preparation, brain-derived neurotrophic factor (BDNF) increased mitogen-activated protein (MAP) kinase-dependent synapsin I phosphorylation and acutely facilitated evoked glutamate release. PD98059, used to inhibit MAP kinase activity, markedly decreased synapsin I phosphorylation and concomitantly reduced neurotransmitter release. The stimulation of glutamate release by BDNF was strongly attenuated in mice lacking synapsin I and/or synapsin II. These results indicate a causal link of synapsin phosphorylation via BDNF, TrkB receptors and MAP kinase with downstream facilitation of neurotransmitter release.
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Acknowledgements
We thank Regeneron Pharmaceuticals for supplying BDNF and NT-3 and A. R. Saltiel (Parke-Davis Pharmaceutical Research Division of Warner-Lambert) for providing us with PD98059. This work was supported by grants from the National Institute of Mental Health and National Institute on Aging (USPHS MH39327 and AG15072) to P.G. and a University Award and grants from the Wellcome Trust (UK) to T.S.S.
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Jovanovic, J., Czernik, A., Fienberg, A. et al. Synapsins as mediators of BDNF-enhanced neurotransmitter release. Nat Neurosci 3, 323–329 (2000). https://doi.org/10.1038/73888
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DOI: https://doi.org/10.1038/73888
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