Regular ArticleEffects of Posttraining Treatments in the Posterior Cingulate Cortex on Short- and Long-Term Memory for Inhibitory Avoidance in Rats☆
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2022, NeuroscienceCitation Excerpt :Later, the same laboratory replicated this amnesic effect and also found that RSC PKA activity inhibition hinders STM and, perhaps, LTM, a tentative conclusion because of scores variance. Interestingly, the muscimol amnesic effect on STM was more robust and easier to verify (Souza et al., 2002). Izquierdo and associates also showed that, in the RSC, adenosine A1 receptors inhibit memory consolidation so that their blockade facilitates IA memory (Pereira et al., 2002b), and the ectonucleotidase pathway responds to a mild footshock (Pereira et al., 2002a).
Individual Subnuclei of the Rat Anterior Thalamic Nuclei Differently affect Spatial Memory and Passive Avoidance Tasks
2020, NeuroscienceCitation Excerpt :One possibility is that the AV nucleus affects consolidation of the PA task via its extensive reciprocal connections with the ACC and retrosplenial cortex (PCC) (van Groen and Wyss, 1990; Shibata and Naito, 2005; Wright et al., 2010) or through its afferents from the prelimbic cortex (Wright et al., 2013). Involvement of the PCC and ACC has been proved in processing information related to consolidation phase of the PA task (Mello e Souza et al., 1999; Souza et al., 2002). It has been shown that stimulation of GABAergic synapses and inhibition of glutamatergic synapses via inactivation of NMDA receptors in the retrosplenial cortex causes disturbances in the PA consolidation (Mello e Souza et al., 1999).
Taraxerol as a possible therapeutic agent on memory impairments and Alzheimer's disease: Effects against scopolamine and streptozotocin-induced cognitive dysfunctions
2018, SteroidsCitation Excerpt :Also, TRX could affect pro- or anti-conflict behaviors, and to considering that, the animals were submitted to the elevated plus-maze test. The animals were allowed to explore the apparatus which consists in two opened arms (50 × 10 cm3), two closed arms (50 × 10 × 15 cm3) and a central area (10 × 10 cm3) 70 cm elevated from floor, which is used to measure anxiety behavior of animals [32]. After 5 min of intra-hippocampal administration of the TRX (1.77 µM/side, 0.5 µL) or vehicle, each animal was placed on the center of the apparatus, facing one of the enclosed arms.
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2015, Neurobiology of Learning and MemoryProtective effects of anthocyanins on the ectonucleotidase activity in the impairment of memory induced by scopolamine in adult rats
2012, Life SciencesCitation Excerpt :Furthermore, our results showed that 5′-nucleotidase and ADA activities seem to be more sensitive in the HC than CC, so we believe that ectonucleotidase in the hippocampus is more affected by scopolamine (see Figs. 3 and 4). However, we can not exclude that specific regions of the cerebral cortex which are known to participate in memory formation, as the posterior cingulate and entorhinal cortex (Lima et al., 2009; Pereira et al., 2005, 2001; Souza et al., 2002), are also affected by SCO administration, so ectonucleotidase activities were measured in the whole cerebral cortex and not in specific regions, might have been the reason that no significant differences were observed in this brain structure. The activity of this enzyme is very important because this leads to production of extracellular adenosine (Burnstock, 2006a, b; Robson et al., 2006; Schetinger et al., 2001).
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This study was supported by Conselho Nacional de Pesquisa (CNPq) and PRONEX, Brazil. We are grateful to Beatriz Aparecida de Almeida Moleta for her contribution to the present work.
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Address correspondence and reprint requests to T. Mello e Souza, Centro de Memória, Departamento de Bioquimica, Instituto de Ciências Bāsicas de Saúde, Universidade Federal do Rio Grande do Sul (UFRGS), Ramiro Barcelos 2600, 90035-003 Porto Alegre, RS, Brazil. Fax: 5551 3165535. E-mail: [email protected].