Retrograde regulation of mossy fiber axon targeting and terminal maturation via postsynaptic Lnx1.

Retrograde regulation of mossy fiber axon targeting and terminal maturation via postsynaptic Lnx1.
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通过突触后 Lnx1 逆行调节苔藓纤维轴突靶向和终末成熟

DOI:
10.1083/jcb.201803105
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发表时间:
2018-11-05
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Xu NJ
Xu NJ
中科院分区:
其他
文献类型:
--
作者:
Liu XD;Zhu XN;Halford MM;Xu TL;Henkemeyer M;Xu NJ

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神经元连接由轴突靶向启动以形成突触。然而,如何通过与突触后元件的相互作用来调节轴突末端的成熟仍然难以捉摸。在这项研究中,我们发现 Numb 蛋白 X 1 (Lnx1) 的配体(一种在海马 CA3 锥体神经元中表达的突触后 PDZ 蛋白)对于出生后苔藓纤维 (MF) 轴突靶向至关重要。 Lnx1 缺失会导致突触排列缺陷,从而导致突触前末梢异常。我们进一步将 EphB 受体鉴定为新型 Lnx1 结合蛋白,形成多蛋白复合物,通过阻止蛋白酶体活性稳定在 CA3 神经元膜上。 EphB1 和 EphB2 独立地需要转导控制 MF 修剪和靶向精确 DG-CA3 突触形成的不同信号。此外,组成型活性 EphB2 激酶可挽救 Lnx1 突变小鼠的有线 MF 端子结构。因此,我们的数据定义了突触后和突触前结构整合所需的逆行跨突触调节,该结构参与青春期期间海马神经回路的构建。
Neuronal connections are initiated by axon targeting to form synapses. However, how the maturation of axon terminals is modulated through interacting with postsynaptic elements remains elusive. In this study, we find that ligand of Numb protein X 1 (Lnx1), a postsynaptic PDZ protein expressed in hippocampal CA3 pyramidal neurons, is essential for mossy fiber (MF) axon targeting during the postnatal period. Lnx1 deletion causes defective synaptic arrangement that leads to aberrant presynaptic terminals. We further identify EphB receptors as novel Lnx1-binding proteins to form a multiprotein complex that is stabilized on the CA3 neuron membrane through preventing proteasome activity. EphB1 and EphB2 are independently required to transduce distinct signals controlling MF pruning and targeting for precise DG-CA3 synapse formation. Furthermore, constitutively active EphB2 kinase rescues structure of the wired MF terminals in Lnx1 mutant mice. Our data thus define a retrograde trans-synaptic regulation required for integration of post- and presynaptic structure that participates in building hippocampal neural circuits during the adolescence period.
多个EPHB受体酪氨酸激酶在海马中塑造树突状刺。
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