Lamina-specific contribution of glutamatergic and GABAergic potentials to hippocampal sharp wave-ripple complexes
The mammalian hippocampus expresses highly organized patterns of neuronal activity which form a neuronal correlate of spatial memories. These memory-encoding neuronal ensembles form on top of different network oscillations which entrain neurons in a state- and experience-dependent manner. The mechan...
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| Main Authors: | , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
25 August 2014
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| In: |
Frontiers in neural circuits
Year: 2014, Volume: 8, Pages: 1-11 |
| ISSN: | 1662-5110 |
| DOI: | 10.3389/fncir.2014.00103 |
| Online Access: | Verlag, kostenfrei, Volltext: https://doi.org/10.3389/fncir.2014.00103 Verlag, kostenfrei, Volltext: https://www.frontiersin.org/articles/10.3389/fncir.2014.00103/full 
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| Author Notes: | Jan Schönberger, Andreas Draguhn and Martin Both |
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| 520 | |a The mammalian hippocampus expresses highly organized patterns of neuronal activity which form a neuronal correlate of spatial memories. These memory-encoding neuronal ensembles form on top of different network oscillations which entrain neurons in a state- and experience-dependent manner. The mechanisms underlying activation, timing and selection of participating neurons are incompletely understood. Here we studied the synaptic mechanisms underlying one prominent network pattern called sharp wave-ripple complexes (SPW-R) which are involved in memory consolidation during sleep. We recorded SPW-R with extracellular electrodes along the different layers of area CA1 in mouse hippocampal slices. Contribution of glutamatergic excitation and GABAergic inhibition, respectively, was probed by local application of receptor antagonists into stratum radiatum, pyramidale and oriens. Laminar profiles of field potentials show that GABAergic potentials contribute substantially to sharp waves and superimposed ripple oscillations in stratum pyramidale. Inhibitory inputs to stratum pyramidale and stratum oriens are crucial for action potential timing by ripple oscillations, as revealed by multiunit-recordings in the pyramidal cell layer. Glutamatergic afferents, on the other hand, contribute to sharp waves in stratum radiatum where they also evoke a fast oscillation at ~ 200 Hz. Surprisingly, field ripples in stratum radiatum are slightly slower than ripples in stratum pyramidale, resulting in a systematic shift between dendritic and somatic oscillations. This complex interplay between dendritic excitation and perisomatic inhibition may be responsible for the precise timing of discharge probability during the time course of SPW-R. Together, our data illustrate a complementary role of spatially confined excitatory and inhibitory transmission during highly ordered network patterns in the hippocampus. | ||
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