Wnt-7a modulates the synaptic vesicle cycle and synaptic transmission in hippocampal neurons

被引：178

作者：

Cerpa, Waldo ^{[1
]}

Godoy, Juan A. ^{[1
]}

Alfaro, Ivan ^{[1
]}

Farlas, Ginny G. ^{[1
]}

Metcalfe, Maria J. ^{[1
]}

Fuentealba, Rodrigo ^{[1
]}

Bonansco, Christian ^{[2
]}

Inestrosa, Nibaldo C. ^{[1
]}

机构：

[1] Pontificia Univ Catolica Chile, Fac Ciencias Biol, Ctr Regul Celular & Patol Joaquin V Luco, Dept Biol Celular & Mol, Santiago 8331010, Chile

[2] Univ Valparaiso, Fac Ciencias, Dept Fisiol, Valparaiso, Chile

来源：

JOURNAL OF BIOLOGICAL CHEMISTRY | 2008年 / 283卷 / 09期

关键词：

D O I：

10.1074/jbc.M705943200

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

Wnt signaling is essential for neuronal development and the maintenance of the developing nervous system. Recent studies indicated that Wnt signaling modulates long term potentiation in adult hippocampal slices. We report here that different Wnt ligands are present in hippocampal neurons of rat embryo and adult rat, including Wnt-4, -5a, -7a, and -11. Wnt-7a acts as a canonical Wnt ligand in rat hippocampal neurons, stimulates clustering of presynaptic proteins, and induces recycling and exocytosis of synaptic vesicles as studied by FM dyes. Wnt-3a has a moderate effect on recycling of synaptic vesicles, and no effect of Wnt-1 and Wnt-5a was detected. Electrophysiological analysis on adult rat hippocampal slices indicates that Wnt-7a, but not Wnt-5a, increases neurotransmitter release in CA3-CA1 synapses by decreasing paired pulse facilitation and increasing the miniature excitatory post-synaptic currents frequency. These results indicate that the presynaptic function of rat hippocampal neurons is modulated by the canonical Wnt signaling.

引用

页码：5918 / 5927

页数：10

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