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Park K, Song S, Hong I, Song B, Kim J, Park S, Lee J, Song S, An B, Kim J, Lee CJ, Shin KS, Choi S, Lee S. Group I mGluR-dependent depotentiation in the lateral amygdala does not require the removal of calcium-permeable AMPA receptors. Front Behav Neurosci 2014; 8:269. [PMID: 25152720 PMCID: PMC4126548 DOI: 10.3389/fnbeh.2014.00269] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2014] [Accepted: 07/21/2014] [Indexed: 01/26/2023] Open
Abstract
There is conflicting evidence regarding whether calcium-permeable receptors are removed during group I mGluR-mediated synaptic depression. In support of this hypothesis, AMPAR rectification, a correlative index of the synaptic expression of GluA2-lacking calcium–permeable AMPARs (CP-AMPARs), is known to decrease after the induction of several types of group I mGluR-mediated long-term depression (LTD), suggesting that a significant proportion of synaptic CP-AMPARs is removed during synaptic depression. We have previously demonstrated that fear conditioning-induced synaptic potentiation in the lateral amygdala is reversed by group 1 mGluR-mediated depotentiation. Here, we examined whether CP-AMPARs are removed by mGluR1-mediated depotentiation of fear conditioning-induced synaptic potentiation. The synaptic expression of CP-AMPARs was negligible before, increased significantly 12 h after, and returned to baseline 48 h after fear conditioning, as evidenced by the changes in the sensitivity of lateral amygdala synaptic responses to NASPM. Importantly, the sensitivity to NASPM was not altered after induction of depotentiation. Our findings, together with previous results, suggest that the removal of CP-AMPARs is not required for the depotentiation of fear conditioning-induced synaptic potentiation at lateral amygdala synapses.
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Affiliation(s)
- Kyungjoon Park
- School of Biological Sciences, College of Natural Sciences, Seoul National University Seoul, Korea (ROK)
| | - Sukwoon Song
- School of Biological Sciences, College of Natural Sciences, Seoul National University Seoul, Korea (ROK)
| | - Ingie Hong
- The Solomon H. Snyder Department of Neuroscience, Howard Hughes Medical Institute, Johns Hopkins University School of Medicine Baltimore, MD, USA
| | - Beomjong Song
- Institute of Neuroscience, Technical University of Munich Munich, Germany
| | - Jeongyeon Kim
- Center for Neural Science and Center for Connectomics, Korea Institute of Science and Technology Seoul, Korea (ROK)
| | - Sungmo Park
- School of Biological Sciences, College of Natural Sciences, Seoul National University Seoul, Korea (ROK)
| | - Junuk Lee
- School of Biological Sciences, College of Natural Sciences, Seoul National University Seoul, Korea (ROK)
| | - Sangho Song
- Center for Neural Science and Center for Connectomics, Korea Institute of Science and Technology Seoul, Korea (ROK)
| | - Bobae An
- School of Biological Sciences, College of Natural Sciences, Seoul National University Seoul, Korea (ROK)
| | - Jihye Kim
- School of Biological Sciences, College of Natural Sciences, Seoul National University Seoul, Korea (ROK)
| | - C Justin Lee
- Center for Neural Science and Center for Connectomics, Korea Institute of Science and Technology Seoul, Korea (ROK)
| | - Ki Soon Shin
- Department of Biology, Department of Life and Nanopharmaceutical Sciences, Kyung Hee University Seoul, Korea (ROK)
| | - Sukwoo Choi
- School of Biological Sciences, College of Natural Sciences, Seoul National University Seoul, Korea (ROK)
| | - Sukwon Lee
- School of Biological Sciences, College of Natural Sciences, Seoul National University Seoul, Korea (ROK)
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