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|data=$a Impacto do colesterol plasmático sobre a cognição de ratos hipertensos $h [recurso eletrônico] / $c Andressa Betat ; orientadora, Renata Maria Larato |
|data=$a Impacto do colesterol plasmático sobre a cognição de ratos hipertensos $h [recurso eletrônico] / $c Andressa Betat ; orientadora, Renata Maria Larato |
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Edição atual tal como às 15h01min de 30 de outubro de 2024
Título principal
Impacto do colesterol plasmático sobre a cognição de ratos hipertensos [recurso eletrônico] / Andressa Betat ; orientadora, Renata Maria Larato
Data de publicação
2024
Descrição física
68 p. : il.
Nota
Disponível somente em versão on-line.
Dissertação (mestrado) – Universidade Federal de Santa Catarina, Centro de Ciências Biológicas, Programa de Pós-Graduação de Ciências Fisiológicas, Florianópolis, 2024.
Inclui referências.
Impacto do colesterol plasmático sobre a cognição de ratos hipertensos [recurso eletrônico] / Andressa Betat ; orientadora, Renata Maria Larato
Data de publicação
2024
Descrição física
68 p. : il.
Nota
Disponível somente em versão on-line.
Dissertação (mestrado) – Universidade Federal de Santa Catarina, Centro de Ciências Biológicas, Programa de Pós-Graduação de Ciências Fisiológicas, Florianópolis, 2024.
Inclui referências.
Abstract: Systemic arterial hypertension (SAH) is a multifactorial clinical condition characterized by an increase in blood pressure levels ≥ 140 and/or 90 mmHg. SAH is the main risk factor for vascular dementia and stroke, as it causes important cerebrovascular changes, thus making the brain prone to heart attacks, microaneurysms, and ischemia. Furthermore, a association between hypercholesterolemia and cognitive impairment in humans has been described. However, there is a lack of studies that independently evaluated the role of hypertension and hypercholesterolemia, or their association, on cognitive impairment. Among the animal models used to understand the impact of SAH, the spontaneously hypertensive rat (SHR) is a commonly used model of hypertension, as it presents progressive increases in blood pressure, similar to SAH in adulthood in humans. Thus, the hypothesis of the study was that hypercholesterolemia will cause cognitive impairment in SHR and that the reduction in blood pressure will produce beneficial effects on cognition in SHR. Therefore, the objective of the study was to evaluate the effects of hypercholesterolemia, and treatment with captopril and amlodipine on the locomotion and memory of hypertensive rats. The rats' locomotion, recognition memory, short-term spatial memory and work memory were assessed using the open field test, new object recognition test, Tmaze test, and Y-maze test. Hypercholesterolemia was induced through a high-fat diet (HD). The experimental protocol was carried out with WISTAR RATS and SHR for seven weeks and at the beginning and end of the experimental protocol, the rats were subjected to memory tests and tail plethysmography, for arterial pressure recording. The administration of the drugs captopril (25mg/kg/day) and amlodipine (10mg/kg/day) was carried out daily through voluntary ingestion by the rats, associated with strawberry jelly and water. The SHR that received a standard diet had higher blood pressure, lower body weight, and lower food intake, remaining longer in the center of the apparatus in the open field, without demonstrating impairments in recognition memory, short-term spatial memory and working memory, compared to WISTAR rats. WISTAR rats that received HD, compared to WISTAR rats that received a standard diet, increased their weight, had higher concentrations of total cholesterol and LDL, lower concentrations of HDL. These rats covered a shorter distance in the open field, however, they did not show impairment in recognition memory, short-term spatial memory and working memory. The SHR who received DH did not change their body weight, however, they showed an increase in total and LDL cholesterol. Hypercholesterolemia in SHR did not change the distance covered in the open field or the duration in the center of the apparatus and also did not induce impairment in recognition memory, short-term spatial memory and working memory. These data indicate that hypertension or hypercholesterolemia, or the association of these two factors, did not produce memory deficits in rats. SHR that received treatment with amlodipine besylate, and captopril showed a decrease in SBP compared to rats that received vehicle. Nevertheless, in memory tests, the rats that received drugs showed no difference in the parameters evaluated. Therefore, it is concluded that the administration of a high-fat diet did not cause any damage to the memory of hypertensive and normotensive rats, likewise, the use of captopril and amlodipine did not cause changes in the memory of SHR.