Spine Dynamics: Are They All the Same?

Spine Dynamics: Are They All the Same?
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DOI:
10.1016/j.neuron.2017.08.008
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发表时间:
2017-09-27
期刊:
影响因子:
16.2
通讯作者:
Nedivi E
Nedivi E
中科院分区:
医学1区
文献类型:
--
作者:
Berry KP;Nedivi E

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自从卡哈尔第一次画出高尔基染色的神经元以来,一代又一代的研究人员都对许多神经元树突上的小突起(称为棘)着迷。哺乳动物中枢神经系统中的大多数兴奋性突触位于树突棘上,使得棘方便地代表兴奋性突触的存在。当体内成像显示树突棘是动态结构时,它们的增加和消除分别被解释为兴奋性突触的获得和丧失。脊柱成像已成为一种流行的兴奋性回路重塑的分析。在这篇综述中,我们重新评估使用脊柱动力学作为电路重新布线的直接反映的有效性。最近在体内追踪棘和突触标记的研究表明,20%的棘缺乏PSD-95并且是短暂的。虽然它们解释了大多数脊柱动力学,但它们的重塑不太可能影响长期的网络结构。我们讨论了不同的作用,脊柱动力学可以发挥电路重塑取决于突触的内容。
Since Cajal’s first drawings of Golgi stained neurons, generations of researchers have been fascinated by the small protrusions, termed spines, studding many neuronal dendrites. Most excitatory synapses in the mammalian CNS are located on dendritic spines, making spines convenient proxies for excitatory synaptic presence. When in vivo imaging revealed that dendritic spines are dynamic structures, their addition and elimination were interpreted as excitatory synapse gain and loss, respectively. Spine imaging has since become a popular assay for excitatory circuit remodeling. In this review, we re-evaluate the validity of using spine dynamics as a straightforward reflection of circuit rewiring. Recent studies tracking both spines and synaptic markers in vivo reveal that 20% of spines lack PSD-95 and are short-lived. Although they account for most spine dynamics, their remodeling is unlikely to impact long-term network structure. We discuss distinct roles that spine dynamics can play in circuit remodeling depending on synaptic content.
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