Transient DREADD Manipulation of the Dorsal Dentate Gyrus in Rats Impairs Initial Learning of Place‐Outcome Associations
ABSTRACT The dentate gyrus subfield of the hippocampus is thought to be critically involved in the disambiguation of similar episodic experiences and places in a context‐dependent manner. However, most empirical evidence has come from lesion and gene knock‐out studies in rodents, in which the dentat...
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| Veröffentlicht in: | Hippocampus Jg. 35; H. 3; S. e70014 - n/a |
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| Sprache: | Englisch |
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Hoboken, USA
John Wiley & Sons, Inc
01.05.2025
Wiley Subscription Services, Inc |
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| Abstract | ABSTRACT
The dentate gyrus subfield of the hippocampus is thought to be critically involved in the disambiguation of similar episodic experiences and places in a context‐dependent manner. However, most empirical evidence has come from lesion and gene knock‐out studies in rodents, in which the dentate gyrus is permanently perturbed and compensation of affected functions via other areas within the memory circuit could take place. The acute and causal role of the dentate gyrus herein remains therefore elusive. The present study aimed to investigate the acute role of the dorsal dentate gyrus in disambiguation learning using reversible inhibitory DREADDs. Rats were trained on a location discrimination task and learned to discriminate between a rewarded and unrewarded location with either small (similar condition) or large (dissimilar condition) separation. Reward contingencies switched after applying a reversal rule, allowing us to track the temporal engagement of the dentate gyrus during the task. Bilateral DREADD modulation of the dentate gyrus impaired the initial acquisition learning of place‐reward associations, but performance rapidly recovered to baseline levels within the same session. Modeling of the behavioral patterns revealed that reward sensitivity and alternation behavior were temporally associated with the DG‐dependent impairment during acquisition learning. Our study thus provides novel evidence that the dorsal dentate gyrus is acutely engaged during the initial acquisition learning of place‐reward associations. |
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| AbstractList | The dentate gyrus subfield of the hippocampus is thought to be critically involved in the disambiguation of similar episodic experiences and places in a context‐dependent manner. However, most empirical evidence has come from lesion and gene knock‐out studies in rodents, in which the dentate gyrus is permanently perturbed and compensation of affected functions via other areas within the memory circuit could take place. The acute and causal role of the dentate gyrus herein remains therefore elusive. The present study aimed to investigate the acute role of the dorsal dentate gyrus in disambiguation learning using reversible inhibitory DREADDs. Rats were trained on a location discrimination task and learned to discriminate between a rewarded and unrewarded location with either small (similar condition) or large (dissimilar condition) separation. Reward contingencies switched after applying a reversal rule, allowing us to track the temporal engagement of the dentate gyrus during the task. Bilateral DREADD modulation of the dentate gyrus impaired the initial acquisition learning of place‐reward associations, but performance rapidly recovered to baseline levels within the same session. Modeling of the behavioral patterns revealed that reward sensitivity and alternation behavior were temporally associated with the DG‐dependent impairment during acquisition learning. Our study thus provides novel evidence that the dorsal dentate gyrus is acutely engaged during the initial acquisition learning of place‐reward associations. ABSTRACT The dentate gyrus subfield of the hippocampus is thought to be critically involved in the disambiguation of similar episodic experiences and places in a context‐dependent manner. However, most empirical evidence has come from lesion and gene knock‐out studies in rodents, in which the dentate gyrus is permanently perturbed and compensation of affected functions via other areas within the memory circuit could take place. The acute and causal role of the dentate gyrus herein remains therefore elusive. The present study aimed to investigate the acute role of the dorsal dentate gyrus in disambiguation learning using reversible inhibitory DREADDs. Rats were trained on a location discrimination task and learned to discriminate between a rewarded and unrewarded location with either small (similar condition) or large (dissimilar condition) separation. Reward contingencies switched after applying a reversal rule, allowing us to track the temporal engagement of the dentate gyrus during the task. Bilateral DREADD modulation of the dentate gyrus impaired the initial acquisition learning of place‐reward associations, but performance rapidly recovered to baseline levels within the same session. Modeling of the behavioral patterns revealed that reward sensitivity and alternation behavior were temporally associated with the DG‐dependent impairment during acquisition learning. Our study thus provides novel evidence that the dorsal dentate gyrus is acutely engaged during the initial acquisition learning of place‐reward associations. The dentate gyrus subfield of the hippocampus is thought to be critically involved in the disambiguation of similar episodic experiences and places in a context-dependent manner. However, most empirical evidence has come from lesion and gene knock-out studies in rodents, in which the dentate gyrus is permanently perturbed and compensation of affected functions via other areas within the memory circuit could take place. The acute and causal role of the dentate gyrus herein remains therefore elusive. The present study aimed to investigate the acute role of the dorsal dentate gyrus in disambiguation learning using reversible inhibitory DREADDs. Rats were trained on a location discrimination task and learned to discriminate between a rewarded and unrewarded location with either small (similar condition) or large (dissimilar condition) separation. Reward contingencies switched after applying a reversal rule, allowing us to track the temporal engagement of the dentate gyrus during the task. Bilateral DREADD modulation of the dentate gyrus impaired the initial acquisition learning of place-reward associations, but performance rapidly recovered to baseline levels within the same session. Modeling of the behavioral patterns revealed that reward sensitivity and alternation behavior were temporally associated with the DG-dependent impairment during acquisition learning. Our study thus provides novel evidence that the dorsal dentate gyrus is acutely engaged during the initial acquisition learning of place-reward associations.The dentate gyrus subfield of the hippocampus is thought to be critically involved in the disambiguation of similar episodic experiences and places in a context-dependent manner. However, most empirical evidence has come from lesion and gene knock-out studies in rodents, in which the dentate gyrus is permanently perturbed and compensation of affected functions via other areas within the memory circuit could take place. The acute and causal role of the dentate gyrus herein remains therefore elusive. The present study aimed to investigate the acute role of the dorsal dentate gyrus in disambiguation learning using reversible inhibitory DREADDs. Rats were trained on a location discrimination task and learned to discriminate between a rewarded and unrewarded location with either small (similar condition) or large (dissimilar condition) separation. Reward contingencies switched after applying a reversal rule, allowing us to track the temporal engagement of the dentate gyrus during the task. Bilateral DREADD modulation of the dentate gyrus impaired the initial acquisition learning of place-reward associations, but performance rapidly recovered to baseline levels within the same session. Modeling of the behavioral patterns revealed that reward sensitivity and alternation behavior were temporally associated with the DG-dependent impairment during acquisition learning. Our study thus provides novel evidence that the dorsal dentate gyrus is acutely engaged during the initial acquisition learning of place-reward associations. |
| Author | Huis in ’t Veld, G. J. Pennartz, C. M. A. Lim, J. Ahmad, P. Lansink, C. S. Souiki, A. Oomen, C. A. Olcese, U. |
| AuthorAffiliation | 1 Cognitive and Systems Neuroscience Group Swammerdam Institute for Life Sciences, University of Amsterdam Amsterdam the Netherlands |
| AuthorAffiliation_xml | – name: 1 Cognitive and Systems Neuroscience Group Swammerdam Institute for Life Sciences, University of Amsterdam Amsterdam the Netherlands |
| Author_xml | – sequence: 1 givenname: J. orcidid: 0000-0002-2502-7432 surname: Lim fullname: Lim, J. organization: Swammerdam Institute for Life Sciences, University of Amsterdam – sequence: 2 givenname: A. surname: Souiki fullname: Souiki, A. organization: Swammerdam Institute for Life Sciences, University of Amsterdam – sequence: 3 givenname: P. surname: Ahmad fullname: Ahmad, P. organization: Swammerdam Institute for Life Sciences, University of Amsterdam – sequence: 4 givenname: C. A. surname: Oomen fullname: Oomen, C. A. organization: Swammerdam Institute for Life Sciences, University of Amsterdam – sequence: 5 givenname: G. J. orcidid: 0000-0002-3237-1047 surname: Huis in ’t Veld fullname: Huis in ’t Veld, G. J. organization: Swammerdam Institute for Life Sciences, University of Amsterdam – sequence: 6 givenname: C. S. surname: Lansink fullname: Lansink, C. S. organization: Swammerdam Institute for Life Sciences, University of Amsterdam – sequence: 7 givenname: C. M. A. orcidid: 0000-0001-8328-1175 surname: Pennartz fullname: Pennartz, C. M. A. email: c.m.a.pennartz@uva.nl organization: Swammerdam Institute for Life Sciences, University of Amsterdam – sequence: 8 givenname: U. orcidid: 0000-0001-6968-2503 surname: Olcese fullname: Olcese, U. email: u.olcese@uva.nl organization: Swammerdam Institute for Life Sciences, University of Amsterdam |
| BackLink | https://www.ncbi.nlm.nih.gov/pubmed/40326013$$D View this record in MEDLINE/PubMed |
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| Keywords | episodic memory place‐reward associations DREADDs dentate gyrus rats hippocampus |
| Language | English |
| License | Attribution 2025 The Author(s). Hippocampus published by Wiley Periodicals LLC. This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
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| Notes | Funding A. Souiki and P. Ahmad are contributed equally to this work. This work was supported by ZonMw and Amsterdam Neuroscience. ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14 content type line 23 Funding: This work was supported by ZonMw and Amsterdam Neuroscience. |
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The dentate gyrus subfield of the hippocampus is thought to be critically involved in the disambiguation of similar episodic experiences and places in... The dentate gyrus subfield of the hippocampus is thought to be critically involved in the disambiguation of similar episodic experiences and places in a... |
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| SubjectTerms | Animals Association Learning - drug effects Association Learning - physiology Dentate gyrus Dentate Gyrus - drug effects Dentate Gyrus - physiology Discrimination Learning - drug effects Discrimination Learning - physiology DREADDs episodic memory hippocampus Learning Male place‐reward associations Rats Rats, Long-Evans Reinforcement Reward |
| Title | Transient DREADD Manipulation of the Dorsal Dentate Gyrus in Rats Impairs Initial Learning of Place‐Outcome Associations |
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