Artículo
The late consolidation of an aversive memory is promoted by VTA dopamine release in the dorsal hippocampus
Kramar, Cecilia Paula
; Castillo Díaz, Fernando
; Gigante, Eduardo D.; Medina, Jorge Horacio
; Barbano, María Flavia
![Icon](/themes/CONICETDigital/images/conicet.png)
![Icon](/themes/CONICETDigital/images/conicet.png)
![Icon](/themes/CONICETDigital/images/conicet.png)
![Icon](/themes/CONICETDigital/images/conicet.png)
Fecha de publicación:
02/2021
Editorial:
Wiley Blackwell Publishing, Inc
Revista:
European Journal of Neuroscience
ISSN:
0953-816X
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
The hippocampus has been implicated in the processing and storage of aversive memories but the precise mechanisms by which these memories persist in time remain elusive. We have demonstrated that dopaminergic neurotransmission in the dorsal hippocampus regulates the long-term storage of both appetitive and aversive memories at a critical time point known as “late consolidation” (12 hr after the learning experience). This modulation appears to have opposite effects depending on the valence of the stimuli, with hippocampal dopamine release peaking immediately and 13–17 hr after a rewarding experience. Here, we determined the release pattern of hippocampal dopamine following an aversive experience, in order to better understand this opposite modulation process. We observed significant increases in dopamine levels at several times (6–8, 11–12, and 15 hr) after subjecting rats to a conditioned place aversion (CPA) task with the aversive agent lithium chloride (LiCl). Early pharmacological blockade of hippocampal DA receptors impaired CPA memory consolidation. In addition and consistent with previous findings showing that late post-training infusions of dopaminergic agents into the hippocampus modulate the long-term storage of aversive memories, we found that the photostimulation of dopaminergic VTA fibers in the dorsal hippocampus 11–12 hr after CPA training was enough to transform a short-lasting long-term memory into a long-lasting one. The fact that the persistence of an aversive memory can still be affected several hours after the learning experience opens new avenues to develop behavioral and pharmacological strategies for the treatment of a variety of mental disorders.
Palabras clave:
AVERSION
,
CPA
,
DOPAMINE
,
HIPPOCAMPUS
,
MEMORY PERSISTENCE
,
RAT
,
VTA
Archivos asociados
Licencia
Identificadores
Colecciones
Articulos(IBCN)
Articulos de INST.DE BIOLO.CEL.Y NEURCS."PROF.E.DE ROBERTIS"
Articulos de INST.DE BIOLO.CEL.Y NEURCS."PROF.E.DE ROBERTIS"
Citación
Kramar, Cecilia Paula; Castillo Díaz, Fernando; Gigante, Eduardo D.; Medina, Jorge Horacio; Barbano, María Flavia; The late consolidation of an aversive memory is promoted by VTA dopamine release in the dorsal hippocampus; Wiley Blackwell Publishing, Inc; European Journal of Neuroscience; 53; 3; 2-2021; 841-851
Compartir
Altmétricas