Proposta de modelo experimental para o estudo da síndrome metabólica
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Data
2008-05-09
Autores
Mota, Clécia Soares de Alencar [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
Na identificação da síndrome metabólica existem controvérsias, pois não há um único critério internacional para a descrição definitiva. As alterações comuns encontradas na tentativa de definir essa síndrome incluem resistência à insulina, com ou sem diabetes mellitus tipo 2, hipertensão arterial, obesidade, dislipidemia, disfunção endotelial, entre outras. Na busca de um modelo experimental adequado ao estudo da síndrome metabólica, o presente estudo visou analisar características metabólicas de ratos submetidos ao tratamento neonatal com aloxana e/ou à dieta hipercalórica altamente palatável a partir do desmame (28 dias) à idade adulta (120 dias). Como o exercício físico tem sido indicado no tratamento desta doença, este estudo visou também avaliar a capacidade aeróbia dos animais. Foram utilizados ratos da linhagem Wistar, que receberam, aos seis dias de idade, injeção intraperitonial de aloxana – grupo aloxana (250mg/Kg de peso corporal); ou tampão citrato 0,01M – grupo controle. Após o desmame (28 dias), os grupos foram subdivididos conforme a dieta recebida, balanceada ou hipercalória, compondo 4 grupos: Controle (C), Hipercalórica (H), Aloxana (A) e Aloxana Hipercalórica (AH). Foram analisados peso corporal, tolerância à glicose e sensibilidade periférica à insulina, pressão sistólica, concentrações séricas de glicose, insulina, triglicerídeos, colesterol total, colesterol HDL, colesterol LDL e AGL, concentrações hepáticas de lipídeos e glicogênio, peso e concentrações de lipídeos nas diferentes regiões do tecido adiposo, secreção de insulina por ilhotas pancreáticas isoladas, composição química da carcaça além das respostas dos animais a um teste de 2 esforço para avaliar a capacidade aeróbia. A partir dos resultados obtidos, foi possível verificar que a associação entre dieta hipercalórica e aloxana (AH)...
There are many controversial points in the metabolic syndrome characterization, since it does not exist an international agreement on the definitive metabolic syndrome concept. Some disorders as insulin resistance, with or without type 2 diabetes, hypertension, obesity, dyslipidemia, endothelial dysfunction are often found among the characteristics included set a definition to metabolic syndrome. In order to establish an adequate model to study the role of exercise on preventing from metabolic syndrome, the present study aimed to evaluate the metabolic characteristics of Wistar rats submitted to neonatal alloxan treatment and /or high palatable diet from weaning (28 days) to adult age (120 days). As physical exercise has used in the treatment of the disease, this study aimed, also, to evaluate the animals’ aerobic capacity. Wistar rats received intraperitonial injection of alloxan – Alloxan group (250mg/kg of body weigh); or citrate buffer 0,01M – Control group. After weaning (28 days), the groups were subdivided according to the diet: balanced (Control) or high caloric diet, forming 4 groups: Control (C), High caloric diet (H), Alloxan (A) and Alloxan High caloric (AH). Body weight gain, glucose tolerance and peripheral insulin sensibility, systolic blood pressure, serum glucose, insulin, triglycerides, total cholesterol, HDL cholesterol, LDL cholesterol and AGL concentration and liver lipid and glycogen concentrations, weight and lipid concentrations in distict regions from adipose tissue, glucose-induced insulin secretion by the isolated pancreatic islets, and the carcass chemical composition were analyzed. The animals responses to an effort tests to evaluate the aerobic capacity were also analyzed. The association between high caloric diet and alloxan was found to be efficient in inducing metabolic syndrome characteristics, since the animals (AH group) presented high body weigh... (Complete abstract click electronic access below)
There are many controversial points in the metabolic syndrome characterization, since it does not exist an international agreement on the definitive metabolic syndrome concept. Some disorders as insulin resistance, with or without type 2 diabetes, hypertension, obesity, dyslipidemia, endothelial dysfunction are often found among the characteristics included set a definition to metabolic syndrome. In order to establish an adequate model to study the role of exercise on preventing from metabolic syndrome, the present study aimed to evaluate the metabolic characteristics of Wistar rats submitted to neonatal alloxan treatment and /or high palatable diet from weaning (28 days) to adult age (120 days). As physical exercise has used in the treatment of the disease, this study aimed, also, to evaluate the animals’ aerobic capacity. Wistar rats received intraperitonial injection of alloxan – Alloxan group (250mg/kg of body weigh); or citrate buffer 0,01M – Control group. After weaning (28 days), the groups were subdivided according to the diet: balanced (Control) or high caloric diet, forming 4 groups: Control (C), High caloric diet (H), Alloxan (A) and Alloxan High caloric (AH). Body weight gain, glucose tolerance and peripheral insulin sensibility, systolic blood pressure, serum glucose, insulin, triglycerides, total cholesterol, HDL cholesterol, LDL cholesterol and AGL concentration and liver lipid and glycogen concentrations, weight and lipid concentrations in distict regions from adipose tissue, glucose-induced insulin secretion by the isolated pancreatic islets, and the carcass chemical composition were analyzed. The animals responses to an effort tests to evaluate the aerobic capacity were also analyzed. The association between high caloric diet and alloxan was found to be efficient in inducing metabolic syndrome characteristics, since the animals (AH group) presented high body weigh... (Complete abstract click electronic access below)
Descrição
Palavras-chave
Fisiologia, Obesidade, Dislipidemia, Resistência à insulina, Physiology, Obesity
Como citar
MOTA, Clécia Soares de Alencar. Proposta de modelo experimental para o estudo da síndrome metabólica. 2008. 160 f. Dissertação (mestrado) - Universidade Estadual Paulista, Instituto de Biociências de Rio Claro, 2008.