Synaptotagmin-IV modulates synaptic function and long-term potentiation by regulating BDNF release.
Synaptotagmin-IV modulates synaptic function and long-term potentiation by regulating BDNF release.
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DOI:
10.1038/nn.2315
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发表时间:
2009-06
影响因子:
25
通讯作者:
Chapman, Edwin R.
中科院分区:
文献类型:
--
作者:
Dean, Camin;Liu, Huisheng;Dunning, F. Mark;Chang, Payne Y.;Jackson, Meyer B.;Chapman, Edwin R.
Synaptotagmin-IV (syt-IV) is a membrane trafficking protein that influences learning and memory, but its localization and role in synaptic function remain unclear. Here we discovered that syt-IV localizes to BDNF-containing vesicles in hippocampal neurons. Syt-IV/BDNF-harboring vesicles undergo exocytosis in both axons and dendrites, and syt-IV inhibits BDNF release at both sites. Knockout of syt-IV increases, and over-expression decreases, the rate of FM dye destaining from presynaptic terminals indirectly via changes in post-synaptic release of BDNF. Hence, post-synaptic syt-IV regulates the trans-synaptic action of BDNF to control presynaptic vesicle dynamics. Furthermore, selective loss of presynaptic syt-IV increased spontaneous quantal release, while loss of post-synaptic syt-IV increased quantal amplitude. Finally, syt-IV knockout mice exhibit enhanced LTP, which depends entirely on disinhibition of BDNF release. Thus, regulation of BDNF secretion by syt-IV emerges as a mechanism to maintain synaptic strength within a useful range during long-term potentiation.
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