Navegando por Autor "Gonzalez, Carolina"
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Artigo Consolidation of object recognition memory requires simultaneous activation of dopamine D1/D5 receptors in the amygdala and medial prefrontal cortex but not in the hippocampus(2013-11) Rossato, Janine I.; Radiske, Andressa; Kohler, Cristiano A.; Gonzalez, Carolina; Bevilaqua, Lia Rejane Müller; Medina, Jorge H.; Cammarota, Martín PabloThe mesocorticolimbic dopaminergic system includes the ventral tegmental area (VTA) and its projections to the amygdala (AMY), the hippocampus (HIP) and the medial prefrontal cortex (mPFC), among others. Object recognition (OR) long-term memory (LTM) processing requires dopaminergic activity but, although some of the brain regions mentioned above are necessary for OR LTM consolidation, their possible dopamine-mediated interplay remains to be analyzed. Using adult male Wistar rats, we found that posttraining microinjection of the dopamine D1/D5 receptor antagonist SCH23390 in mPFC or AMY, but not in HIP, impaired OR LTM. The dopamine D2 receptor agonist quinpirole had no effect on retention. VTA inactivation also hindered OR LTM, and even though this effect was unaffected by co-infusion of the dopamine D1/D5 receptor agonist SKF38393 in HIP, mPFC or AMY alone, it was reversed by simultaneous activation of D1/D5 receptors in the last two regions. Our results demonstrate that the mesocorticolimbic dopaminergic system is indeed essential for OR LTM consolidation and suggest that the role played by some of its components during this process is much more complex than previously thought.Artigo Medial prefrontal cortex is a crucial node of a rapid learning system that retrieves recent and remote memories(2013) Gonzalez, Carolina; Kramar, Cecilia; Garagoli, Fernando; Rossato, Janine I.; Weisstaub, Noelia; Cammarota, Martín Pablo; Medina, Jorge H.The neocortex is thought to be a distributed learning system that gradually integrates semantic information into the initial mnemonic representation rapidly formed by the hippocampus after acquisition. Nevertheless, an emerging view suggests that some cortical regions, in particular the medial prefrontal cortex (mPFC), may also have a role during the initial steps of memory consolidation as well as in the recall of recent memories. Here, we show that mPFC plays a critical role during the first few hours of inhibitory avoidance memory consolidation and is necessary for the normal retrieval of both recent and remote memories, supporting the idea that involvement of neocortical areas in memory processing is not restricted to the late post-training consolidation phase.Artigo On the Role of Retrosplenial Cortex in Long-Lasting Memory Storage(2013) Katche, Cynthia; Dorman, Guido; Gonzalez, Carolina; Kramar, Cecilia P.; Slipczuk, Leandro; Rossato, Janine I.; Cammarota, Martín Pablo; Medina, Jorge H.The retrosplenial cortex (RSC) is involved in a range of cognitive functions. However, its precise involvement in memory processing is unknown. Pharmacological and behavioral experiments demonstrate that protein synthesis and c-Fos expression in the anterior part of RSC (aRSC) are necessary late after training to maintain for many days a fear-motivated memory. Long-lasting memory storage is regulated by D1/ D5 dopamine receptors in aRSC and depends on the functional interplay between dorsal hippocampus and aRSC. These results suggest that the RSC recapitulates some of the molecular events that occur in the hippocampus to maintain memory trace over time.