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mGluRs Modulate Strength and Timing of Excitatory Transmission in Hippocampal Area CA3

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Abstract

Excitatory transmission within hippocampal area CA3 stems from three major glutamatergic pathways: the perforant path formed by axons of layer II stellate cells in the entorhinal cortex, the mossy fiber axons originating from the dentate gyrus granule cells, and the recurrent axon collaterals of CA3 pyramidal cells. The synaptic communication of each of these pathways is modulated by metabotropic glutamate receptors that fine-tune the signal by affecting both the timing and strength of the connection. Within area CA3 of the hippocampus, group I mGluRs (mGluR1 and mGluR5) are expressed postsynaptically, whereas group II (mGluR2 and mGluR3) and III mGluRs (mGluR4, mGluR7, and mGluR8) are expressed presynaptically. Receptors from each group have been demonstrated to be required for different forms of pre- and postsynaptic long-term plasticity and also have been implicated in regulating short-term plasticity. A recent observation has demonstrated that a presynaptically expressed mGluR can affect the timing of action potentials elicited in the postsynaptic target. Interestingly, mGluRs can be distributed in a target-specific manner, such that synaptic input from one presynaptic neuron can be modulated by different receptors at each of its postsynaptic targets. Consequently, mGluRs provide a mechanism for synaptic specialization of glutamatergic transmission in the hippocampus. This review will highlight the variability in mGluR modulation of excitatory transmission within area CA3 with an emphasis on how these receptors contribute to the strength and timing of network activity within pyramidal cells and interneurons.

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Authors and Affiliations

  1. Department of Physiology, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA

    Kathleen E. Cosgrove

  2. Department of Pharmacobiology, CINVESTAV-Sur, Mexico City, Mexico

    Emilio J. Galván

  3. Department of Neuroscience, University of Pittsburgh, A210 Langley Hall, Pittsburgh, PA 15260, USA

    Germán Barrionuevo & Stephen D. Meriney

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  1. Kathleen E. Cosgrove
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  2. Emilio J. Galván
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  3. Germán Barrionuevo
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  4. Stephen D. Meriney
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Correspondence to Stephen D. Meriney.

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Cosgrove, K.E., Galván, E.J., Barrionuevo, G. et al. mGluRs Modulate Strength and Timing of Excitatory Transmission in Hippocampal Area CA3. Mol Neurobiol 44, 93–101 (2011). https://doi.org/10.1007/s12035-011-8187-z

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