Título principal
Intervenções metabólicas sobre o comportamento e cognição [recurso eletrônico] : efeitos de dietas hiperlipídicas e fármacos da classe estatina em processos comportamentais e na memória de roedores / orientador, Eduardo Luiz Gasnhar Moreira ; coorientador Gianni Mancini.
Data de publicação
2022
Descrição física
129 p. : il. gráfs. tab.
Nota
Disponível somente em versão on-line.
Tese (doutorado) - Universidade Federal de Santa Catarina, Centro de Ciências Biológicas, Programa de Pós-Graduação em Neurociências, Florianópolis, 2022.
Inclui referências.
Intervenções metabólicas sobre o comportamento e cognição [recurso eletrônico] : efeitos de dietas hiperlipídicas e fármacos da classe estatina em processos comportamentais e na memória de roedores / orientador, Eduardo Luiz Gasnhar Moreira ; coorientador Gianni Mancini.
Data de publicação
2022
Descrição física
129 p. : il. gráfs. tab.
Nota
Disponível somente em versão on-line.
Tese (doutorado) - Universidade Federal de Santa Catarina, Centro de Ciências Biológicas, Programa de Pós-Graduação em Neurociências, Florianópolis, 2022.
Inclui referências.
Abstract: The relation between behavior and cognition are complex, rigorous scientific investigation is necessary to undestand this interaction. In this work, from two different and not directly connected studies, we evaluated how different metabolic, dietary and pharmacological interferences can influence behavioral and cognitive processes in rodents. Despite many studies showing the long-term impacts of high-fat diets (HFD) on the organism, the temporal dynamic of behavior and metabolic effects in short periods of an HFD is poorly known, this was the objective of fist chapter of this work. In this we show that short periods of HFD (15, 25, and 35 days) differently impacted behavior and metabolism in Swiss mice. The results suggest that after 15 days of the diet, animals show alteration of exploratory habituation, accompanied by a significant increase in visceral adipose mass, fasting glucose, and glucose intolerance. After 25 days of the diet, the metabolic effects intensified, and animals showed impairment in the recognition memory acquisition, in addition to a significant increase in the variation of body mass, accompanied by a significant increase in plasma cholesterol and triglyceride levels. Finally, 35 days of diet resulted in an intensification of the effects observed in the previous groups, and an anxiogenic-like effect was observed in the open field test. Moreover, it was found that metabolic effects positively correlate with behavioral impairments. We also showed that 35 days of HFD induced mitochondrial dysfunction in the prefrontal cortex. Our data reveal some aspects of the flow of metabolic disorders and their relation to the HFD’s behavioral changes and cognitive impairments. In the second chapter, the study focused on evaluating, through an experimental approach and a systematic review, the possible effects of statins on learning and memory processes in rodents. It was experimentally observed that acute intervention with simvastatin immediately before training prevented fear memory formation in mice in the inhibitory avoidance paradigm. A systematic review of the literature revealed evidence of positive and negative effects on memory in rodents undergoing treatment with statins. The positive effects were observed in studies that evaluated the treatment in insults to the nervous system or models of different pathologies. Such consequences were normally associated with plasma cholesterol lowering effects and pleiotropic anti-inflammatory and antioxidant effects. In another line, most of the studies that evaluated the per se effect of statins on memory point to losses induced by these drugs on learning and mnemonic processes, such effects vary in mechanisms, being mainly related to the reduction of cholesterol and other derivatives of the mevalonate pathway in neurons. Interestingly, there do not seem to be any clear dose-dependence or dose-specific relationships, which indicates that the modulation of these drugs on learning and memory processes is complex. Further studies should investigate how different doses of statins influence the processing phases of different memory systems.