Spatio-temporal specialization of GABAergic septo-hippocampal neurons for rhythmic network activity
Medial septal GABAergic neurons of the basal forebrain innervate the hippocampus and related cortical areas, contributing to the coordination of network activity, such as theta oscillations and sharp wave-ripple events, via a preferential innervation of GABAergic interneurons. Individual medial sept...
| Main Authors: | , , , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
Springer Berlin Heidelberg
2018
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| _version_ | 1797097969298702336 |
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| author | Unal, G Crump, MG Viney, TJ Éltes, T Katona, L Klausberger, T Somogyi, P |
| author_facet | Unal, G Crump, MG Viney, TJ Éltes, T Katona, L Klausberger, T Somogyi, P |
| author_sort | Unal, G |
| collection | OXFORD |
| description | Medial septal GABAergic neurons of the basal forebrain innervate the hippocampus and related cortical areas, contributing to the coordination of network activity, such as theta oscillations and sharp wave-ripple events, via a preferential innervation of GABAergic interneurons. Individual medial septal neurons display diverse activity patterns, which may be related to their termination in different cortical areas and/or to the different types of innervated interneurons. To test these hypotheses, we extracellularly recorded and juxtacellularly labeled single medial septal neurons in anesthetized rats in vivo during hippocampal theta and ripple oscillations, traced their axons to distant cortical target areas, and analyzed their postsynaptic interneurons. Medial septal GABAergic neurons exhibiting different hippocampal theta phase preferences and/or sharp wave-ripple related activity terminated in restricted hippocampal regions, and selectively targeted a limited number of interneuron types, as established on the basis of molecular markers. We demonstrate the preferential innervation of bistratified cells in CA1 and of basket cells in CA3 by individual axons. One group of septal neurons was suppressed during sharp wave-ripples, maintained their firing rate across theta and non-theta network states and mainly fired along the descending phase of CA1 theta oscillations. In contrast, neurons that were active during sharp wave-ripples increased their firing significantly during "theta" compared to "non-theta" states, with most firing during the ascending phase of theta oscillations. These results demonstrate that specialized septal GABAergic neurons contribute to the coordination of network activity through parallel, target area- and cell type-selective projections to the hippocampus. |
| first_indexed | 2024-03-07T05:02:55Z |
| format | Journal article |
| id | oxford-uuid:d8ef7858-b23f-49a1-9be1-ec93f6679f03 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T05:02:55Z |
| publishDate | 2018 |
| publisher | Springer Berlin Heidelberg |
| record_format | dspace |
| spelling | oxford-uuid:d8ef7858-b23f-49a1-9be1-ec93f6679f032022-03-27T08:52:18ZSpatio-temporal specialization of GABAergic septo-hippocampal neurons for rhythmic network activityJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:d8ef7858-b23f-49a1-9be1-ec93f6679f03EnglishSymplectic Elements at OxfordSpringer Berlin Heidelberg2018Unal, GCrump, MGViney, TJÉltes, TKatona, LKlausberger, TSomogyi, PMedial septal GABAergic neurons of the basal forebrain innervate the hippocampus and related cortical areas, contributing to the coordination of network activity, such as theta oscillations and sharp wave-ripple events, via a preferential innervation of GABAergic interneurons. Individual medial septal neurons display diverse activity patterns, which may be related to their termination in different cortical areas and/or to the different types of innervated interneurons. To test these hypotheses, we extracellularly recorded and juxtacellularly labeled single medial septal neurons in anesthetized rats in vivo during hippocampal theta and ripple oscillations, traced their axons to distant cortical target areas, and analyzed their postsynaptic interneurons. Medial septal GABAergic neurons exhibiting different hippocampal theta phase preferences and/or sharp wave-ripple related activity terminated in restricted hippocampal regions, and selectively targeted a limited number of interneuron types, as established on the basis of molecular markers. We demonstrate the preferential innervation of bistratified cells in CA1 and of basket cells in CA3 by individual axons. One group of septal neurons was suppressed during sharp wave-ripples, maintained their firing rate across theta and non-theta network states and mainly fired along the descending phase of CA1 theta oscillations. In contrast, neurons that were active during sharp wave-ripples increased their firing significantly during "theta" compared to "non-theta" states, with most firing during the ascending phase of theta oscillations. These results demonstrate that specialized septal GABAergic neurons contribute to the coordination of network activity through parallel, target area- and cell type-selective projections to the hippocampus. |
| spellingShingle | Unal, G Crump, MG Viney, TJ Éltes, T Katona, L Klausberger, T Somogyi, P Spatio-temporal specialization of GABAergic septo-hippocampal neurons for rhythmic network activity |
| title | Spatio-temporal specialization of GABAergic septo-hippocampal neurons for rhythmic network activity |
| title_full | Spatio-temporal specialization of GABAergic septo-hippocampal neurons for rhythmic network activity |
| title_fullStr | Spatio-temporal specialization of GABAergic septo-hippocampal neurons for rhythmic network activity |
| title_full_unstemmed | Spatio-temporal specialization of GABAergic septo-hippocampal neurons for rhythmic network activity |
| title_short | Spatio-temporal specialization of GABAergic septo-hippocampal neurons for rhythmic network activity |
| title_sort | spatio temporal specialization of gabaergic septo hippocampal neurons for rhythmic network activity |
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