Corticosterone and corticotropin-releasing factor acutely facilitate gamma oscillations in the hippocampus in vitro
© 2014 Federation of European Neuroscience Societies and John Wiley & Sons Ltd..
Stressful experiences do not only cause peripheral changes in stress hormone levels, but also affect central structures such as the hippocampus, implicated in spatial orientation, stress evaluation, and learning and memory. It has been suggested that formation of memory traces is dependent on hippocampal gamma oscillations observed during alert behaviour and rapid eye movement sleep. Furthermore, during quiescent behaviour, sharp wave-ripple (SW-R) activity emerges. These events provide a temporal window during which reactivation of memory ensembles occur. We hypothesized that stress-responsive modulators, such as corticosterone (CORT), corticotropin-releasing factor (CRF) and the neurosteroid 3α, 21-dihydroxy-5α-pregnan-20-one (THDOC) are able to modulate gamma oscillations and SW-Rs. Using in vitro hippocampal slices, we studied acute and subacute (2 h) impact of these agents on gamma oscillations in area cornu ammonis 3 of the ventral hippocampus induced by acetylcholine (10 μm) combined with physostigmine (2 μm). CORT increased the gamma oscillations in a dose-dependent fashion. This effect was mediated by glucocorticoid receptors. Likewise, CRF augmented gamma oscillations via CRF type 1 receptor. Lastly, THDOC was found to diminish cholinergic gamma oscillations in a dose-dependent manner. Neither CORT, CRF nor THDOC modulated gamma power when pre-applied for 1 h, 2 h before the induction of gamma oscillations. Interestingly, stress-related neuromodulators had rather mild effects on spontaneous SW-R compared with their effects on gamma oscillations. These data suggest that the alteration of hippocampal gamma oscillation strength in vitro by stress-related agents is an acute process, permitting fast adaptation to new attention-requiring situations in vivo.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2015 |
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| Erschienen: |
2015 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:41 |
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| Enthalten in: |
The European journal of neuroscience - 41(2015), 1 vom: 25. Jan., Seite 31-44 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Çalışkan, Gürsel [VerfasserIn] |
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| Links: |
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| Anmerkungen: |
Date Completed 27.08.2015 Date Revised 02.12.2018 published: Print-Electronic Citation Status MEDLINE |
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| doi: |
10.1111/ejn.12750 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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NLM242700543 |
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| 245 | 1 | 0 | |a Corticosterone and corticotropin-releasing factor acutely facilitate gamma oscillations in the hippocampus in vitro |
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| 500 | |a Date Completed 27.08.2015 | ||
| 500 | |a Date Revised 02.12.2018 | ||
| 500 | |a published: Print-Electronic | ||
| 500 | |a Citation Status MEDLINE | ||
| 520 | |a © 2014 Federation of European Neuroscience Societies and John Wiley & Sons Ltd. | ||
| 520 | |a Stressful experiences do not only cause peripheral changes in stress hormone levels, but also affect central structures such as the hippocampus, implicated in spatial orientation, stress evaluation, and learning and memory. It has been suggested that formation of memory traces is dependent on hippocampal gamma oscillations observed during alert behaviour and rapid eye movement sleep. Furthermore, during quiescent behaviour, sharp wave-ripple (SW-R) activity emerges. These events provide a temporal window during which reactivation of memory ensembles occur. We hypothesized that stress-responsive modulators, such as corticosterone (CORT), corticotropin-releasing factor (CRF) and the neurosteroid 3α, 21-dihydroxy-5α-pregnan-20-one (THDOC) are able to modulate gamma oscillations and SW-Rs. Using in vitro hippocampal slices, we studied acute and subacute (2 h) impact of these agents on gamma oscillations in area cornu ammonis 3 of the ventral hippocampus induced by acetylcholine (10 μm) combined with physostigmine (2 μm). CORT increased the gamma oscillations in a dose-dependent fashion. This effect was mediated by glucocorticoid receptors. Likewise, CRF augmented gamma oscillations via CRF type 1 receptor. Lastly, THDOC was found to diminish cholinergic gamma oscillations in a dose-dependent manner. Neither CORT, CRF nor THDOC modulated gamma power when pre-applied for 1 h, 2 h before the induction of gamma oscillations. Interestingly, stress-related neuromodulators had rather mild effects on spontaneous SW-R compared with their effects on gamma oscillations. These data suggest that the alteration of hippocampal gamma oscillation strength in vitro by stress-related agents is an acute process, permitting fast adaptation to new attention-requiring situations in vivo | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a Research Support, Non-U.S. Gov't | |
| 650 | 4 | |a corticosterone | |
| 650 | 4 | |a corticotropin-releasing factor | |
| 650 | 4 | |a gamma oscillations | |
| 650 | 4 | |a hippocampus | |
| 650 | 4 | |a neurosteroid | |
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| 650 | 7 | |a Neurotransmitter Agents |2 NLM | |
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| 650 | 7 | |a tetrahydrodeoxycorticosterone |2 NLM | |
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| 700 | 1 | |a Schulz, Steffen B |e verfasserin |4 aut | |
| 700 | 1 | |a Gruber, David |e verfasserin |4 aut | |
| 700 | 1 | |a Behr, Joachim |e verfasserin |4 aut | |
| 700 | 1 | |a Heinemann, Uwe |e verfasserin |4 aut | |
| 700 | 1 | |a Gerevich, Zoltan |e verfasserin |4 aut | |
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