Why am I lost without dopamine? Effects of 6-OHDA lesion on the encoding of reward and decision process in CA3
There is growing evidence that Parkinson's disease, generally characterized by motor symptoms, also causes cognitive impairment such as spatial disorientation. The hippocampus is a critical structure for spatial navigation and receives sparse but comprehensive dopamine (DA) innervation. DA loss...
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doaj-0455d9b310834cc3b85f903aa42adad22021-03-22T12:40:14ZengElsevierNeurobiology of Disease1095-953X2013-11-0159151164Why am I lost without dopamine? Effects of 6-OHDA lesion on the encoding of reward and decision process in CA3Aude Retailleau0Cyril Dejean1Benjamin Fourneaux2Xavier Leinekugel3Thomas Boraud4University of Bordeaux, Institut des Maladies Neurodegeneratives UMR 5293, Bordeaux, France; CNRS, Institut des Maladies Neurodegeneratives UMR 5293, Bordeaux, FranceUniversity of Bordeaux, Institut de Neurosciences Cognitives et Integratives d'Aquitaine UMR 5287, Bordeaux, France; CNRS, Institut de Neurosciences Cognitives et Integratives d'Aquitaine UMR 5287, Bordeaux, FranceUniversity of Bordeaux, Institut des Maladies Neurodegeneratives UMR 5293, Bordeaux, France; CNRS, Institut des Maladies Neurodegeneratives UMR 5293, Bordeaux, FranceUniversity of Bordeaux, Institut des Maladies Neurodegeneratives UMR 5293, Bordeaux, France; CNRS, Institut des Maladies Neurodegeneratives UMR 5293, Bordeaux, FranceUniversity of Bordeaux, Institut des Maladies Neurodegeneratives UMR 5293, Bordeaux, France; CNRS, Institut des Maladies Neurodegeneratives UMR 5293, Bordeaux, France; Corresponding author at: CNRS, Institut des Maladies Neurodegeneratives UMR 5293, Bordeaux, France.There is growing evidence that Parkinson's disease, generally characterized by motor symptoms, also causes cognitive impairment such as spatial disorientation. The hippocampus is a critical structure for spatial navigation and receives sparse but comprehensive dopamine (DA) innervation. DA loss is known to be the cause of Parkinson's disease and therefore it has been hypothesized that the associated spatial disorientation could result from hippocampal dysfunction. Because DA is involved in the prediction of reward expectation, it is possible to infer that spatial disorientation in DA depleted subjects results from the loss of the ability to detect the rewarding features within the environment. Amongst hippocampal formation subdivisions, CA3 properties such as the high liability of its place fields make it a serious candidate for interfacing DA reward system and spatial information encoding. We addressed this issue using multiple electrode recordings of CA3 in normal and dopamine depleted rats performing a spatial learning in a Y-maze. Our data confirm that DA is essential to spatial learning as its depletion results in spatial impairments. The present work also shows that CA3 involvement in the detection of spatial feature contextual significance is under DA control. Finally, it also shows that CA3 contributes to the decision making processes of navigation tasks. The data also reveal a lateralization effect of DA depletion underlined by neural correlates.http://www.sciencedirect.com/science/article/pii/S0969996113002088Spatial navigationHippocampusMonoamineElectrophysiologyBehavioral studiesRats |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Aude Retailleau Cyril Dejean Benjamin Fourneaux Xavier Leinekugel Thomas Boraud |
spellingShingle |
Aude Retailleau Cyril Dejean Benjamin Fourneaux Xavier Leinekugel Thomas Boraud Why am I lost without dopamine? Effects of 6-OHDA lesion on the encoding of reward and decision process in CA3 Neurobiology of Disease Spatial navigation Hippocampus Monoamine Electrophysiology Behavioral studies Rats |
author_facet |
Aude Retailleau Cyril Dejean Benjamin Fourneaux Xavier Leinekugel Thomas Boraud |
author_sort |
Aude Retailleau |
title |
Why am I lost without dopamine? Effects of 6-OHDA lesion on the encoding of reward and decision process in CA3 |
title_short |
Why am I lost without dopamine? Effects of 6-OHDA lesion on the encoding of reward and decision process in CA3 |
title_full |
Why am I lost without dopamine? Effects of 6-OHDA lesion on the encoding of reward and decision process in CA3 |
title_fullStr |
Why am I lost without dopamine? Effects of 6-OHDA lesion on the encoding of reward and decision process in CA3 |
title_full_unstemmed |
Why am I lost without dopamine? Effects of 6-OHDA lesion on the encoding of reward and decision process in CA3 |
title_sort |
why am i lost without dopamine? effects of 6-ohda lesion on the encoding of reward and decision process in ca3 |
publisher |
Elsevier |
series |
Neurobiology of Disease |
issn |
1095-953X |
publishDate |
2013-11-01 |
description |
There is growing evidence that Parkinson's disease, generally characterized by motor symptoms, also causes cognitive impairment such as spatial disorientation. The hippocampus is a critical structure for spatial navigation and receives sparse but comprehensive dopamine (DA) innervation. DA loss is known to be the cause of Parkinson's disease and therefore it has been hypothesized that the associated spatial disorientation could result from hippocampal dysfunction. Because DA is involved in the prediction of reward expectation, it is possible to infer that spatial disorientation in DA depleted subjects results from the loss of the ability to detect the rewarding features within the environment. Amongst hippocampal formation subdivisions, CA3 properties such as the high liability of its place fields make it a serious candidate for interfacing DA reward system and spatial information encoding. We addressed this issue using multiple electrode recordings of CA3 in normal and dopamine depleted rats performing a spatial learning in a Y-maze. Our data confirm that DA is essential to spatial learning as its depletion results in spatial impairments. The present work also shows that CA3 involvement in the detection of spatial feature contextual significance is under DA control. Finally, it also shows that CA3 contributes to the decision making processes of navigation tasks. The data also reveal a lateralization effect of DA depletion underlined by neural correlates. |
topic |
Spatial navigation Hippocampus Monoamine Electrophysiology Behavioral studies Rats |
url |
http://www.sciencedirect.com/science/article/pii/S0969996113002088 |
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