The Importance of Ventral Hippocampal Dopamine and Norepinephrine in Recognition Memory

Titulaer, JoepUppsala universitet,Institutionen för farmaceutisk biovetenskap,Karolinska Inst, Sect Neuropsychopharmacol, Dept Physiol & Pharmacol, Stockholm, Sweden. (författare)

De två sista författarna delar sistaförfattarskapet.
Dopaminergic neurons originating from the ventral tegmental area (VTA) and the locus coeruleus are innervating the ventral hippocampus and are thought to play an essential role for efficient cognitive function. Moreover, these VTA projections are hypothesized to be part of a functional loop, in which dopamine regulates memory storage. It is hypothesized that when a novel stimulus is encountered and recognized as novel, increased dopamine activity in the hippocampus induces long-term potentiation and long-term storage of memories. We here demonstrate the importance of increased release of dopamine and norepinephrinein the rat ventral hippocampus on recognition memory, using microdialysis combined to a modified novel object recognition test. We found that presenting rats to a novel object significantly increased dopamine and norepinephrine output in the ventral hippocampus. Two hours after introducing the first object, a second object (either novel or familiar) was placed in the same position as the first object. Presenting the animals to a second novel object significantly increased dopamine and norepinephrine release in the ventral hippocampus, compared to a familiar object. In conclusion, this study suggests that dopamine and norepinephrine output in the ventral hippocampus has a crucial role in recognition memory and signals novelty.

MEDICIN OCH HÄLSOVETENSKAP Medicinska och farmaceutiska grundvetenskaper Neurovetenskaper hsv//swe
MEDICAL AND HEALTH SCIENCES Basic Medicine Neurosciences hsv//eng
ventral hippocampus
hippocampus
dopamine
norepinephrine
microdialysis
novelty
novel object recognition (NOR)
recognition memory

Björkholm, CarlKarolinska Inst, Sect Neuropsychopharmacol, Dept Physiol & Pharmacol, Stockholm, Sweden.;Janssen Cilag AB, Solna, Sweden. (författare)
Feltmann, KristinKarolinska Institutet (författare)
Malmlöf, TorunKarolinska Inst, Sect Neuropsychopharmacol, Dept Physiol & Pharmacol, Stockholm, Sweden. (författare)
Mishra, DeveshKarolinska Inst, Sect Neuropsychopharmacol, Dept Physiol & Pharmacol, Stockholm, Sweden. (författare)
Bengtsson Gonzales, CarolinaKarolinska Inst, Sect Neuropsychopharmacol, Dept Physiol & Pharmacol, Stockholm, Sweden. (författare)
Schilström, BjörnKarolinska Inst, Sect Neuropsychopharmacol, Dept Physiol & Pharmacol, Stockholm, Sweden. (författare)
Konradsson-Geuken, ÅsaUppsala universitet,Institutionen för farmaceutisk biovetenskap,Karolinska Inst, Sect Neuropsychopharmacol, Dept Physiol & Pharmacol, Stockholm, Sweden.(Swepub:uu)asako336 (författare)
Uppsala universitetInstitutionen för farmaceutisk biovetenskap (creator_code:org_t)

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