Postsynaptic, not presynaptic NMDA receptors are required for spike-timing-dependent LTD induction.

Postsynaptic, not presynaptic NMDA receptors are required for spike-timing-dependent LTD induction.
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DOI:
10.1038/nn.4343
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发表时间:
2016-09
影响因子:
25
通讯作者:
Jahr, Craig E.
Jahr, Craig E.
中科院分区:
医学1区
文献类型:
--
作者:
Carter, Brett C.;Jahr, Craig E.

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皮质第4层棘状星状细胞和第2/3层锥体细胞之间的长期抑制(LTD)需要NMDARs的激活。在幼年啮齿动物中,这种形式的LTD被反复报道需要突触前NMDAR进行诱导。在这里,我们发现在2-3周龄的大鼠和小鼠的躯体感觉皮层的这个突触,LTD的诱导需要突触后而不是突触前的NMDAR。首先,使用双光子激光扫描显微镜和双光子谷氨酸去势,我们没有发现L4神经元轴突中有功能的NMDAR的证据。第二,我们发现突触后NMDAR的基因缺失阻止了LTD的诱导,而不是突触前NMDAR的缺失。最后,NMDAR需求的药理学与非离子信号机制是一致的。
Long-term depression (LTD) between cortical layer 4 spiny stellate cells and layer 2/3 pyramidal cells requires the activation of NMDA receptors (NMDARs). In young rodents, this form of LTD has been repeatedly reported to require presynaptic NMDARs for its induction. Here we show that at this synapse in the somatosensory cortex of 2 to 3 week old rats and mice, postsynaptic, not presynaptic NMDARs are required for LTD induction. First, we find no evidence for functional NMDARs in L4 neuron axons using 2 photon laser scanning microscopy and 2 photon glutamate uncaging. Second, we find that genetic deletion of postsynaptic, but not presynaptic NMDARs prevents LTD induction. Finally, the pharmacology of the NMDAR requirement is consistent with a non-ionic signaling mechanism.
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