한빛사논문
Abstract
Sukwon Lee1,6, Beomjong Song1,6, Jeongyeon Kim2,6, Kyungjoon Park3,4, Ingie Hong1, Bobae An1, Sangho Song1, Jiwon Lee1, Sungmo Park1, Jihye Kim1, Dongeun Park1, C Justin Lee2, Kyungjin Kim1, Ki Soon Shin3,4, Richard W Tsien5 & Sukwoo Choi1
1School of Biological Sciences, College of Natural Sciences, Seoul National University, Seoul, Korea. 2Center for Neural Science and Center for Functional Connectomics, Korea Institute of Science and Technology, Seoul, Korea. 3Department of Biology, Kyunghee University, Seoul, Korea. 4Department of Life and Nanopharmaceutical Sciences, Kyunghee University, Seoul, Korea. 5Department of Physiology and Neuroscience, Neuroscience Institute, New York University Langone Medical Center, New York, New York, USA. 6These authors contributed equally to this work.
Correspondence to: Sukwoo Choi or Ki Soon Shin or Kyungjin Kim
Abstract
Fear renewal, a widely pursued model of post-traumatic stress disorder and phobias, refers to the context-specific relapse of conditioned fear after extinction. However, its molecular mechanisms are largely unknown. We found that renewal-inducing stimuli, generally believed to be insufficient to induce synaptic plasticity, enhanced excitatory synaptic strength, activity of synaptic GluA2-lacking AMPA receptors and Ser831 phosphorylation of synaptic surface GluA1 in the lateral nucleus of the amygdala (LAn) of fear-extinguished rats. Consistently, the induction threshold for LAn synaptic potentiation was considerably lowered after extinction, and renewal occluded this low-threshold potentiation. The low-threshold potentiation (a potential cellular substrate for renewal), but not long-term potentiation, was attenuated by dialysis into LAn neurons of a GluA1-derived peptide that competes with Ser831-phosphorylated GluA1. Microinjections of the same peptide into the LAn attenuated fear renewal, but not fear learning. Our findings suggest that GluA1 phosphorylation constitutes a promising target for clinical treatment of aberrant fear-related disorders.
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