Acute ketamine challenge increases resting state prefrontal-hippocampal connectivity in both humans and rats
RationaleAberrant prefrontal-hippocampal (PFC-HC) connectivity is disrupted in several psychiatric and at-risk conditions. Advances in rodent functional imaging have opened the possibility that this phenotype could serve as a translational imaging marker for psychiatric research. Recent evidence fro...
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| Hauptverfasser: | , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
18 July 2015
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| In: |
Psychopharmacology
Year: 2015, Jahrgang: 232, Heft: 21-22, Pages: 4231-4241 |
| ISSN: | 1432-2072 |
| DOI: | 10.1007/s00213-015-4022-y |
| Online-Zugang: | Verlag, Volltext: http://dx.doi.org/10.1007/s00213-015-4022-y Verlag, Volltext: https://link.springer.com/article/10.1007/s00213-015-4022-y 
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| Verfasserangaben: | Oliver Grimm, Natalia Gass, Wolfgang Weber-Fahr, Alexander Sartorius, Esther Schenker, Michael Spedding, Celine Risterucci, Janina Isabel Schweiger, Andreas Böhringer, Zhenxiang Zang, Heike Tost, Adam James Schwarz, Andreas Meyer-Lindenberg |
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| 245 | 1 | 0 | |a Acute ketamine challenge increases resting state prefrontal-hippocampal connectivity in both humans and rats |c Oliver Grimm, Natalia Gass, Wolfgang Weber-Fahr, Alexander Sartorius, Esther Schenker, Michael Spedding, Celine Risterucci, Janina Isabel Schweiger, Andreas Böhringer, Zhenxiang Zang, Heike Tost, Adam James Schwarz, Andreas Meyer-Lindenberg |
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| 520 | |a RationaleAberrant prefrontal-hippocampal (PFC-HC) connectivity is disrupted in several psychiatric and at-risk conditions. Advances in rodent functional imaging have opened the possibility that this phenotype could serve as a translational imaging marker for psychiatric research. Recent evidence from functional magnetic resonance imaging (fMRI) studies has indicated an increase in PFC-HC coupling during working-memory tasks in both schizophrenic patients and at-risk populations, in contrast to a decrease in resting-state PFC-HC connectivity. Acute ketamine challenge is widely used in both humans and rats as a pharmacological model to study the mechanisms of N-methyl-d-aspartate (NMDA) receptor hypofunction in the context of psychiatric disorders.ObjectivesWe aimed to establish whether acute ketamine challenge has consistent effects in rats and humans by investigating resting-state fMRI PFC-HC connectivity and thus to corroborate its potential utility as a translational probe.MethodsTwenty-four healthy human subjects (12 females, mean age 25 years) received intravenous doses of either saline (placebo) or ketamine (0.5 mg/kg body weight). Eighteen Sprague-Dawley male rats received either saline or ketamine (25 mg/kg). Resting-state fMRI measurements took place after injections, and the data were analyzed for PFC-HC functional connectivity.ResultsIn both species, ketamine induced a robust increase in PFC-HC coupling, in contrast to findings in chronic schizophrenia.ConclusionsThis translational comparison demonstrates a cross-species consistency in pharmacological effect and elucidates ketamine-induced alterations in PFC-HC coupling, a phenotype often disrupted in pathological conditions, which may give clue to understanding of psychiatric disorders and their onset, and help in the development of new treatments. | ||
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