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首页> 外文期刊>Neuron >AMPA receptor signaling through BRAG2 and Arf6 critical for long-term synaptic depression.
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AMPA receptor signaling through BRAG2 and Arf6 critical for long-term synaptic depression.

机译:通过BRAG2和Arf6传递的AMPA受体信号对于长期突触抑制至关重要。

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Central nervous system synapses undergo activity-dependent alterations to support learning and memory. Long-term depression (LTD) reflects a sustained reduction of the synaptic AMPA receptor content based on targeted clathrin-mediated endocytosis. Here we report a current-independent form of AMPA receptor signaling, fundamental for LTD. We found that AMPA receptors directly interact via the GluA2 subunit with the synaptic protein BRAG2, which functions as a guanine-nucleotide exchange factor (GEF) for the coat-recruitment GTPase Arf6. BRAG2-mediated catalysis, controlled by ligand-binding and tyrosine phosphorylation of GluA2, activates Arf6 to internalize synaptic AMPA receptors upon LTD induction. Furthermore, acute blockade of the GluA2-BRAG2 interaction and targeted deletion of BRAG2 in mature hippocampal CA1 pyramidal neurons prevents LTD in CA3-to-CA1 cell synapses, irrespective of the induction pathway. We conclude that BRAG2-mediated Arf6 activation triggered by AMPA receptors is the convergent step of different forms of LTD, thus providing an essential mechanism for the control of vesicle formation by endocytic cargo.
机译:中枢神经系统突触经历活动依赖的改变,以支持学习和记忆。长期抑郁症(LTD)反映了基于靶向网格蛋白介导的内吞作用的突触AMPA受体含量的持续降低。在这里,我们报告AMPA受体信号传导的电流独立形式,这对于LTD是必不可少的。我们发现,AMPA受体通过GluA2亚基直接与突触蛋白BRAG2相互作用,该突触蛋白充当鸟嘌呤核苷酸GTPase Arf6的鸟嘌呤-核苷酸交换因子(GEF)。 BRAG2介导的催化作用受GluA2的配体结合和酪氨酸磷酸化控制,在LTD诱导后激活Arf6以内化突触AMPA受体。此外,在成熟的海马CA1锥体神经元中,GluA2-BRAG2相互作用的急性阻断和BRAG2的靶向缺失,无论诱导途径如何,均可阻止LTD3-CA1到CA1细胞突触中的LTD。我们得出的结论是,AMPA受体触发的BRAG2介导的Arf6激活是不同形式的LTD的收敛步骤,从而提供了控制内吞货物形成囊泡的重要机制。

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