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タイトル: | Entire Course and Distinct Phases of Day-Lasting Depression of Miniature EPSC Amplitudes in Cultured Purkinje Neurons |
著者: | Murashima, Miho Hirano, Tomoo |
著者名の別形: | 平野, 丈夫 |
キーワード: | synaptic plasticity miniature EPSCs culture cerebellum Purkinje neuron long-term depression late phase critical period mRNA synthesis protein synthesis |
発行日: | 1-Sep-1999 |
出版者: | Society for Neuroscience |
誌名: | Journal of Neuroscience |
巻: | 19 |
号: | 17 |
開始ページ: | 7326 |
終了ページ: | 7333 |
抄録: | The cerebellar long-term depression (LTD) is the long-lasting reduction of transmission efficacy at the granule neuron–Purkinje neuron (G–P) synapses and is a candidate mechanism for the motor learning. Despite extensive studies on its induction and expression mechanisms, it has not been known how long the LTD lasts. The LTD is accompanied by the decrease in the postsynaptic responsiveness to glutamate, the transmitter at G–P synapses. Therefore, during the LTD, the amplitude of miniature EPSCs (mEPSCs) at G–P synapses should decrease. We studied the depression of mEPSC amplitudes (DME) as a possible contributing factor for the LTD and found that the conditioning treatment of cultured cerebellar neurons with 50 mm K+ and 100 μmglutamate, an analogous condition used to induce the LTD, induced the long-lasting DME. The mEPSC amplitudes recovered to the original level 48 hr after the 5 min conditioning treatment. Changing the duration of the conditioning revealed that the DME consisted of two distinct phases: the early phase lasting for a few hours and the late phase for >1 d. The latter was distinguished from the former by its requirement of prolonged conditioning treatment and syntheses of mRNA and protein for the induction. There were critical periods for mRNA and protein syntheses. The critical period for protein synthesis was much longer than that for mRNA synthesis. These results demonstrate that the DME lasts for 1–2 d and that it consists of two phases, whose induction and maintenance mechanisms are distinct. |
著作権等: | This artisle is released under a different license, the Creative Commons Attribution-Noncommercial-Share Alike 3.0 Unported License (http://creativecommons.org/licenses/by-nc-sa/3.0). |
URI: | http://hdl.handle.net/2433/229516 |
DOI(出版社版): | 10.1523/jneurosci.19-17-07326.1999 |
PubMed ID: | 10460239 |
関連リンク: | http://www.jneurosci.org/content/19/17/7326 |
出現コレクション: | 学術雑誌掲載論文等 |
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