Synapse type-specific proteomic dissection identifies IgSF8 as a hippocampal CA3 microcircuit organizer.

Synapse type-specific proteomic dissection identifies IgSF8 as a hippocampal CA3 microcircuit organizer.
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突触类型特异性蛋白质组学解剖鉴定IgSF8作为海马CA3微电路组织者。

DOI:
10.1038/s41467-020-18956-x
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发表时间:
2020-10-14
影响因子:
16.6
通讯作者:
de Wit J
de Wit J
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Apóstolo N;Smukowski SN;Vanderlinden J;Condomitti G;Rybakin V;Ten Bos J;Trobiani L;Portegies S;Vennekens KM;Gounko NV;Comoletti D;Wierda KD;Savas JN;de Wit J

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兴奋性和抑制性神经元连接成产生电路输出的微电路。海马CA 3区微回路的中心是苔藓纤维(MF)突触,它为CA 3区锥体神经元提供强大的直接兴奋性输入和间接前馈抑制。在这里,我们剖析其细胞表面蛋白(CSP)的组成,发现新的调节MF突触连接。分离的MF突触体的蛋白质组学分析揭示了丰富的CSP组合物,包括许多没有突触功能的CSP和几个未知的CSP。细胞表面相互作用组筛选鉴定IgSF 8为MF途径中富集的神经元受体。突触前Igsf 8缺失损害MF突触结构,并显著降低提供前馈抑制的终扣丝状伪足的密度。因此,IgSF 8损失损害兴奋/抑制平衡并增加CA 3锥体神经元的兴奋性。我们的研究结果提供了一个特定的兴奋性突触的CSP景观和相互作用组的见解,并揭示了IgSF 8作为CA 3微电路连接和功能的关键调节器。苔藓纤维突触是CA 3微回路功能的关键。在这里,作者概况苔藓纤维突触蛋白质组和细胞表面相互作用组。他们发现了细胞表面蛋白的多样性,并将受体IgSF 8鉴定为CA 3微电路连接和功能的调节剂。
Excitatory and inhibitory neurons are connected into microcircuits that generate circuit output. Central in the hippocampal CA3 microcircuit is the mossy fiber (MF) synapse, which provides powerful direct excitatory input and indirect feedforward inhibition to CA3 pyramidal neurons. Here, we dissect its cell-surface protein (CSP) composition to discover novel regulators of MF synaptic connectivity. Proteomic profiling of isolated MF synaptosomes uncovers a rich CSP composition, including many CSPs without synaptic function and several that are uncharacterized. Cell-surface interactome screening identifies IgSF8 as a neuronal receptor enriched in the MF pathway. Presynaptic Igsf8 deletion impairs MF synaptic architecture and robustly decreases the density of bouton filopodia that provide feedforward inhibition. Consequently, IgSF8 loss impairs excitation/inhibition balance and increases excitability of CA3 pyramidal neurons. Our results provide insight into the CSP landscape and interactome of a specific excitatory synapse and reveal IgSF8 as a critical regulator of CA3 microcircuit connectivity and function. Mossy fiber synapses are key in CA3 microcircuit function. Here, the authors profile the mossy fiber synapse proteome and cell-surface interactome. They uncover a diverse repertoire of cell-surface proteins and identify the receptor IgSF8 as a regulator of CA3 microcircuit connectivity and function.
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