Abstract：
:Memory consolidation is the process by which recently acquired information becomes stable and is modulated by different neurotransmitters depending on the structure involved and the nature of the memory. Here we evaluate the participation of both D1 and D5 dopamine receptors in the CA1 region of the hippocampus in the consolidation of the memory of two different tasks, object recognition (OR) and inhibitory avoidance (IA). For this, male rats with infusion cannulae stereotaxically implanted in the CA1 region of the dorsal hippocampus were trained in an OR task involving exposure to two different objects, or in a one-trial step-down IA task. At different times after the training, some of the animals received intrahippocampal infusions of the D1-family receptor antagonist SCH-23390. In a test session carried out 24h later, the animals that received infusions immediately or 60 min but not 180 min after the training showed impaired long-term memory. Since D1- and D5-subtypes engage different signaling pathways involving cAMP-dependent protein kinase (PKA) and protein kinase C (PKC), respectively, we assessed whether they participate distinctively in consolidation. The animals that received intra-CA1 infusions of the PKA inhibitor, Rp-cAMP, or the PKC inhibitor, Gö6976, immediately after OR or IA training had a long-term memory impairment and the amnesic effect caused by SCH-23390 was reversed when co-infused with activators of PKA (8Br-cAMP) or PKC (PMA). These results indicate that both D1 and D5 dopamine receptors are required in the CA1 region of the hippocampus for consolidation of the two tasks. This supports the notion of a commonality of consolidation mechanisms across tasks.
journal_name
Behav Brain Resjournal_title
Behavioural brain researchauthors
Furini CR,Myskiw JC,Schmidt BE,Marcondes LA,Izquierdo Idoi
10.1016/j.bbr.2014.06.027subject
Has Abstractpub_date
2014-09-01 00:00:00pages
212-7eissn
0166-4328issn
1872-7549pii
S0166-4328(14)00401-Xjournal_volume
271pub_type
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