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首页> 外文期刊>Neuron >Two Forms of Synaptic Depression Produced by Differential Neuromodulation of Presynaptic Calcium Channels
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Two Forms of Synaptic Depression Produced by Differential Neuromodulation of Presynaptic Calcium Channels

机译:突触前钙通道的差异神经调节产生的两种形式的突触抑郁症

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摘要

Neuromodulators are important regulators of synaptic transmission throughout the brain. At the presynaptic terminal, neuromodulation of calcium channels (CaVs) can affect transmission not only by changing neurotransmitter release probability, but also by shaping short-term plasticity (STP). Indeed, changes in STP are often considered a requirement for defining a presynaptic site of action. Nevertheless, some synapses exhibit non-canonical forms of neuromodulation, where release probability is altered without a corresponding change in STP. Here, we identify biophysical mechanisms whereby both canonical and non-canonical presynaptic neuromodulation can occur at the same synapse. At a subset of glutamatergic terminals in prefrontal cortex, GABABand D1/D5 dopamine receptors suppress release probability with and without canonical increases in short-term facilitation by modulating different aspects of presynaptic CaV function. These findings establish a framework whereby signaling from multiple neuromodulators can converge on presynaptic CaVs to differentially tune release dynamics at the same synapse.
机译:神经调节剂是整个大脑中突触传递的重要调节因素。在突触前终端,钙通道(脉冲)的神经调节不仅可以通过改变神经递质释放概率而影响传播,而且可以通过成形短期可塑性(STP)来影响变速器。实际上,STP的变化通常被认为是定义突触前行动部位的要求。然而,一些突触表现出非规范形式的神经调节,其中释放概率在没有STP的相应变化的情况下改变。在这里,我们鉴定生物物理机制,由此可以在同一突触处发生规范和非规范突触前神经调节。在前额叶皮质的谷氨酸末端末端的子集中,通过调节突触图Cav功能的不同方面,GABABAND D1 / D5多巴胺受体抑制了与短期促进的释放概率,并且没有规范增加。这些发现建立了一个框架,由此来自多种神经调节器的信号传导可以在同一突触中的差异调谐释放动态上融合到普通突触域中。

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