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Abundant distribution of TARP γ-8 in synaptic and extrasynaptic surface of hippocampal neurons and its major role in AMPA receptor expression on spines and dendrites

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Title: Abundant distribution of TARP γ-8 in synaptic and extrasynaptic surface of hippocampal neurons and its major role in AMPA receptor expression on spines and dendrites
Authors: Fukaya, Masahiro Browse this author
Tsujita, Mika Browse this author
Yamazaki, Maya Browse this author
Kushiya, Etsuko Browse this author
Abe, Manabu Browse this author
Akashi, Kaori Browse this author
Natsume, Rie Browse this author
Kano, Masanobu Browse this author
Kamiya, Haruyuki Browse this author
Watanabe, Masahiko Browse this author →KAKEN DB
Sakimura, Kenji Browse this author
Keywords: Hippocampus
pyramidal cell
transmembrane AMPA receptor regulatory protein
immunohistochemistry
immunoblot
Issue Date: Oct-2006
Publisher: Blackwell Publishing
Journal Title: European Journal of Neuroscience
Volume: 24
Issue: 8
Start Page: 2177
End Page: 2190
Publisher DOI: 10.1111/j.1460-9568.2006.05081.x
PMID: 17074043
Abstract: Transmembrane AMPA receptor regulatory proteins (TARPs) play pivotal roles in AMP A receptor trafficking and gating. Here we examined cellular and subcellular distribution of TARP γ-8 in the mouse brain. Immunoblot and immunofluorescence revealed the highest concentration of γ-8 in the hippocampus. Immunogold electron microscopy demonstrated dense distribution of γ-8 on the synaptic and extrasynaptic surface of hippocampal neurons with very low intracellular labeling. Of the neuronal surface, γ-8 was distributed at the highest level on asymmetrical synapses of pyramidal cells and interneurons, whereas their asymmetrical synapses selectively lacked immunogold labeling. Then, the role of γ-8 in AMPA receptor expression was pursued in the hippocampus using mutant mice defective in the γ-8 gene. In the mutant CA1 region, synaptic and extrasynaptic AMPA receptors on dendrites and spines were severely reduced to 35-37% of control levels, whereas reduction was mild for extrasynaptic receptors on somata (74%) and no significant decrease was seen for intracellular receptors within spines. In the mutant CA3 region, synaptic AMPA receptors were reduced mildly at asymmetrical synapses in the stratum radiatum (67% of control level), and showed no significant decrease at mossy fiber-CA3 synapses. Therefore, γ-8 is abundantly distributed on hippocampal excitatory synapses and extrasynaptic membranes, and plays an important role in increasing the number of synaptic and extrasynaptic AMPA receptors on dendrites and spines, particularly, in the CA1 region. Variable degrees of reduction further suggest that other TARPs may also mediate this function at different potencies depending on hippocampal subregions, input sources, and neuronal compartments.
Rights: The definitive version is available at www.blackwell-synergy.com
Type: article (author version)
URI: http://hdl.handle.net/2115/30133
Appears in Collections:医学院・医学研究院 (Graduate School of Medicine / Faculty of Medicine) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 渡邉 雅彦

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