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Adenosine A1 Receptor-Mediated Endocytosis of AMPA Receptors Contributes to Impairments in Long-Term Potentiation (LTP) in the Middle-Aged Rat Hippocampus

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Abstract

Aging causes multiple changes in the mammalian brain, including changes in synaptic signaling. Previous reports have shown increased extracellular adenosine in the aging brain, and we recently reported that activation of adenosine A1 receptors (A1Rs) induces AMPA receptor (AMPAR) internalization in rat hippocampus. This study investigated whether aging-related changes in the rat hippocampus include altered surface expression of adenosine A1 and A2A receptors, and whether these changes correspond to changes in AMPAR surface expression and altered synaptic plasticity. We found reduced A1R surface expression in middle-aged rat hippocampus, and also reduced GluA1 and GluA2 AMPAR subunit surface expression. Using a chemically-induced LTP (cLTP) experimental protocol, we recorded fEPSPs in young (1 month old) and middle-aged (7–12 month old) rat hippocampal slices. There were significant impairments in cLTP in middle-aged slices, suggesting impaired synaptic plasticity. Since we previously showed that the A1R agonist N6-cyclopentyladenosine (CPA) reduced both A1Rs and GluA2/GluA1 AMPARs, we hypothesized that the observed impaired synaptic plasticity in middle-aged brains is regulated by A1R-mediated AMPAR internalization by clathrin-mediated endocytosis. Following cLTP, we found a significant increase in GluA1 and GluA2 surface expression in young rats, which was blunted in middle-aged brains or in young brains pretreated with CPA. Blocking A1Rs with 8-cyclopentyl-1,3-dipropylxanthine or AMPAR endocytosis with either Tat-GluA2-3Y peptide or dynasore (dynamin inhibitor) similarly enhanced AMPAR surface expression following cLTP. These data suggest that age-dependent alteration in adenosine receptor expression contributes to increased AMPAR endocytosis and impaired synaptic plasticity in aged brains.

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Authors and Affiliations

  1. Laboratory for Neurodegenerative Research, Brigham & Women’s Hospital and Harvard Institutes of Medicine, Room 931, 77 Avenue Louis Pasteur, Boston, 02115, MA, USA

    Zhicheng Chen

  2. Department of Surgery, Neuroscience Research Group, College of Medicine, Room GD30.5, D-Wing Health Science Building, University of Saskatchewan, 107 Wiggins Road, Saskatoon, SK, S7N 5E5, Canada

    Jocelyn Stockwell & Francisco S. Cayabyab

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  1. Zhicheng Chen
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  2. Jocelyn Stockwell
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  3. Francisco S. Cayabyab
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Correspondence to Francisco S. Cayabyab.

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Chen, Z., Stockwell, J. & Cayabyab, F.S. Adenosine A1 Receptor-Mediated Endocytosis of AMPA Receptors Contributes to Impairments in Long-Term Potentiation (LTP) in the Middle-Aged Rat Hippocampus. Neurochem Res 41, 1085–1097 (2016). https://doi.org/10.1007/s11064-015-1799-3

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