首页> 外文期刊>The European Journal of Neuroscience >Metabotropic glutamate receptors mediate expression of LTP in slices of rat visual cortex.
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Metabotropic glutamate receptors mediate expression of LTP in slices of rat visual cortex.

机译:代谢型谷氨酸受体介导大鼠视皮层切片中LTP的表达。

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摘要

Long-term-potentiation (LTP) can be induced by application of a standard theta-burst stimulation protocol in slice preparations of the neocortex. This type of LTP is known to be dependent on the activation of NMDA receptors. The present study used specific experimental conditions to evoke a non-NMDA receptor mediated type of LTP. By use of weak theta-burst stimulation (wTBS) we describe a non-NMDA receptor dependent LTP in rat visual cortex in vitro, which is sensitive to an antagonist of metabotropic glutamate receptors (mGluR). In slices of the visual cortex we stimulated ascending inputs in cortical layer IV and recorded extracellular field potentials (FPs) from cortical layers II/III. In disinhibited slices (with 1 microm picrotoxin), a wTBS induced LTP to 138% of control. The expression of this potentiation was insensitive to the NMDA-receptor antagonist, D-AP5, but could be abolished by application of the mGluR antagonist MCPG. These data suggest an NMDA-independent mechanism for LTP induction in the visual cortex which can be observed in layer II/III neurons.
机译:可以通过在新皮质的切片制剂中应用标准的theta-burst刺激方案来诱导长期增强(LTP)。已知这种类型的LTP取决于NMDA受体的激活。本研究使用特定的实验条件来唤起非NMDA受体介导的LTP类型。通过使用弱theta-burst刺激(wTBS),我们在体外大鼠皮层中描述了非NMDA受体依赖性LTP,它对代谢型谷氨酸受体(mGluR)的拮抗剂敏感。在视觉皮层的切片中,我们刺激了皮质层IV中的上升输入,并记录了皮质层II / III中的细胞外场电势(FPs)。在去抑制的切片(含1微米微毒素)中,wTBS诱导LTP达到对照的138%。这种增强的表达对NMDA受体拮抗剂D-AP5不敏感,但可以通过应用mGluR拮抗剂MCPG来消除。这些数据表明可见皮层中LTP诱导的NMDA独立机制,可以在II / III层神经元中观察到。

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