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    MGluR5 Mediates the Interaction between Late-LTP, Network Activity, and Learning

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    Authors
    Bikbaev, Arthur
    Neyman, Sergey
    Ngomba, Richard Teke
    Conn, Jeffrey
    Nicoletti, Ferdinando
    Manahan-Vaughan, Denise
    Issue Date
    2008-05-14
    URI
    http://hdl.handle.net/10675.2/564
    
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    Abstract
    Hippocampal synaptic plasticity and learning are strongly regulated by metabotropic glutamate receptors (mGluRs) and particularly by mGluR5. Here, we investigated the mechanisms underlying mGluR5-modulation of these phenomena. Prolonged pharmacological blockade of mGluR5 with MPEP produced a profound impairment of spatial memory. Effects were associated with 1) a reduction of mGluR1a-expression in the dentate gyrus; 2) impaired dentate gyrus LTP; 3) enhanced CA1-LTP and 4) suppressed theta (5â 10 Hz) and gamma (30â 100 Hz) oscillations in the dentate gyrus. Allosteric potentiation of mGluR1 after mGluR5 blockade significantly ameliorated dentate gyrus LTP, as well as suppression of gamma oscillatory activity. CA3-lesioning prevented MPEP effects on CA1-LTP, suggesting that plasticity levels in CA1 are driven by mGluR5-dependent synaptic and network activity in the dentate gyrus. These data support the hypothesis that prolonged mGluR5-inactivation causes altered hippocampal LTP levels and network activity, which is mediated in part by impaired mGluR1-expression in the dentate gyrus. The consequence is impairment of long-term learning.
    Citation
    PLoS ONE. 2008 May 14; 3(5):e2155
    ae974a485f413a2113503eed53cd6c53
    10.1371/journal.pone.0002155
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