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GluD2 Endows Parallel Fiber-Purkinje Cell Synapses with a High Regenerative Capacity

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タイトル: GluD2 Endows Parallel Fiber-Purkinje Cell Synapses with a High Regenerative Capacity
著者: Ichikawa, Ryoichi 著作を一覧する
Sakimura, Kenji 著作を一覧する
Watanabe, Masahiko 著作を一覧する
キーワード: cerebellum
climbing fiber
GluD2
parallel fiber
Purkinje cell
synapse regeneration
発行日: 2016年 4月27日
出版者: Society for Neuroscience
誌名: Journal of neuroscience
巻: 36
号: 17
開始ページ: 4846
終了ページ: 4858
出版社 DOI: 10.1523/JNEUROSCI.0161-16.2016
抄録: Although injured axons usually do not regenerate in the adult CNS, parallel fibers (PFs) regenerate synaptic connections onto cerebellar Purkinje cells (PCs). In this study, we investigated the role of GluD2 in this regenerative process after PF transection using GluD2-knock-out (KO) mice. All dendritic spines on distal dendrites were innervated by PFs in sham-operated wild-type controls, whereas one-third were devoid of innervation in GluD2-KO mice. In both genotypes, a steep drop in the number of PF synapses occurred with a reciprocal surge in the number of free spines on postlesion day 1, when the PF territory aberrantly expanded toward the proximal dendrites. In wild-type mice, the territory and number of PF synapses were nearly fully restored to normal on postlesion day 7, although PF density remained low. Moreover, presynaptic and postsynaptic elements were markedly enlarged, and the PF terminal-to-PC spine contact ratio increased from 1:1 to 1:2 at most synapses. On postlesion day 30, the size and contact ratio of PF synapses returned to sham-operated control values and PF density recovered through the sprouting and elongation of PF collaterals. However, GluD2-KO mice showed neither a hypertrophic response nor territorial restoration 7 d postlesion, nor the recovery of PF axons or synapses on postlesion day 30. This suggests that PF wiring regenerates initially by inducing hypertrophic responses in surviving synaptic elements (hypertrophic phase), followed by collateral formation by PF axons and retraction of PF synapses (remodeling phase). Without GluD2, no transition to these regenerative phases occurs.
資料タイプ: article
URI: http://hdl.handle.net/2115/63208
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 渡邉 雅彦

 

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