Brain-derived neurotrophic factor-induced potentiation of glutamate and GABA release: Different dependency on signaling pathways and neuronal activity

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• 作者：Tomoya Matsumoto ; Tadahiro Numakawa ; Daisaku Yokomaku ; Naoki Adachi ; Satoru Yamagishi ; Yumiko Numakawa ; Hiroshi Kunugi and Takahisa Taguchi
• 刊名：Molecular and Cellular Neuroscience
• 出版年：2006
• 出版时间：January 2006
• 年：2006
• 卷：31
• 期：1
• 页码：70-84
• 全文大小：1036 K

文摘

The mechanisms underlying BDNF-modulated neurotransmitter release remain elusive. Here, we found that 24-h exposure of postnatal cortical neurons to BDNF potentiated depolarization-evoked glutamate and GABA release in a protein synthesis-dependent manner. BDNF-potentiated glutamate release occurred through the PLC-γ and MAPK pathways. The expression of synapsin I, synaptotagmin, and synaptophysin, but not of syntaxin or SNAP25, increased through the PLC-γ and MAPK pathways. In contrast, BDNF-up-regulated GABA release and GAD65/67 expression depended on MAPK. Furthermore, neuronal activity was necessary for the up-regulation of glutamate release and synapsin I, synaptotagmin, and synaptophysin expression, but not of GABA or GAD65/67. PLC-γ inhibitor attenuated BDNF-stimulated long-lasting MAPK activation. As BDNF rapidly potentiates glutamatergic transmission through PLC-γ (J. Biol. Chem. 277, (2002) 6520–6529), PLC-γ-mediated neuronal activity might sustain MAPK activation, resulting in BDNF-potentiated glutamate release. In conclusion, BDNF potentiates the excitatory and inhibitory system separately, which may be important for the regulation of synaptic plasticity.