Efeitos do treinamento físico moderado nas concentrações de grelina, leptina e no eixo GH-IGF em ratos diabéticos
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Data
2010-10-04
Autores
Leme, José Alexandre Curiacos de Almeida [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
Para investigar os efeitos do treinamento físico moderado nas concentrações de grelina, leptina, GH e IGF-I em ratos diabéticos, ratos wistar foram distribuídos nos seguintes grupos: controle sedentário, controle treinado, diabético sedentário e diabético treinado. A indução do diabetes foi feita por aloxana (32 mg/kg). Após determinação da carga equivalente à máxima fase estável do lactato (MFEL), o protocolo de treinamento físico de natação consistiu de 1 hora/dia, 5 dias/semana durante 8 semanas suportando uma carga equivalente à 90% da MFEL. Durante o período experimental foram registradas semanalmente a massa corporal e ingestão hídrica e alimentar. Ao final do período experimental, foi feita a eutanásia dos animais e o sangue foi coletado para determinação das concentrações de glicose, insulina, albumina, triglicerídeos, GH, IGF-I, grelina acilada e leptina. A massa do estômago foi registrada e foram coletadas amostras dos seguintes tecidos: fígado para determinação de IGF-I, proteína, DNA e triglicerídeos; pâncreas para determinação de IGF-I, proteína e DNA; hipófise para determinação de GH, estômago para determinação de grelina, proteína e DNA e tecido adiposo epididimal para determinação de leptina, proteína e DNA. O diabetes experimental reduziu a massa e comprimento corporal além das concentrações no sangue de insulina, leptina, GH e IGF-I, mas aumentou as ingestões hídrica e alimentar, e as concentrações de triglicerídeos, glicose e grelina acilada sanguíneas. Nos animais diabéticos, o exercício físico promoveu redução da ingestão alimentar, diminuiu as concentrações sanguíneas de glicose e triglicerídeos e recuperou os valores de IGF-I. No fígado, o diabetes reduziu os valores de IGF-I, proteína e razão proteína/DNA, aumentou os valores de triglicerídeos que foram recuperados pelo treinamento físico...
In order to investigate the effects of moderate physical training in the concentrations of ghrelin, leptin, GH and IGF-I in diabetic rats, Wistar rats were distributed in four groups: sedentary control, trained control, sedentary diabetic and trained diabetic. Experimental diabetes was induced by alloxan (32 mg / bw). After workload determination equivalent to maximal lactate steady-state (MLSS), the exercise training protocol consisted in swimming 1 h / day, 5 days / week during 8 weeks supporting a load equivalent to 90% of the MLSS. During the experimental period, weekly body mass, and water and food intake were recorded. At the end of the experiment, euthanasia was performed and the blood was collected to determine the level of glucose, insulin, albumin, triglycerides, GH, IGF-I, acylated ghrelin and leptin. The weight of the stomach was recorded and samples of the following tissues were collected: liver to determine IGF-I, protein, DNA and triglycerides; pancreas to determine IGF-I, protein and DNA; pituitary to determine GH; stomach to determine of ghrelin, protein and DNA and epididymal adipose tissue to determine leptin, protein and DNA. In addition to body weight and length, experimental diabetes also reduced blood concentrations of insulin, leptin, GH and IGF-I. Nevertheless, it increased water and food intake, and also the concentrations of triglycerides, blood glucose and acylated ghrelin. In diabetic rats, exercise caused a reduction of food intake, blood concentrations of glucose and triglycerides, and recovery blood IGF-I. In the liver, diabetes reduced the IGF-I, protein and protein/DNA ratio values, and increased triglycerides level, which was recovered by physical training in these parameters. Diabetes also reduced pituitary GH concentrations, which did not alter by physical training. On the other hand, training increased IGF-I and protein / DNA ratio values... (Complete abstract click electronic access below)
In order to investigate the effects of moderate physical training in the concentrations of ghrelin, leptin, GH and IGF-I in diabetic rats, Wistar rats were distributed in four groups: sedentary control, trained control, sedentary diabetic and trained diabetic. Experimental diabetes was induced by alloxan (32 mg / bw). After workload determination equivalent to maximal lactate steady-state (MLSS), the exercise training protocol consisted in swimming 1 h / day, 5 days / week during 8 weeks supporting a load equivalent to 90% of the MLSS. During the experimental period, weekly body mass, and water and food intake were recorded. At the end of the experiment, euthanasia was performed and the blood was collected to determine the level of glucose, insulin, albumin, triglycerides, GH, IGF-I, acylated ghrelin and leptin. The weight of the stomach was recorded and samples of the following tissues were collected: liver to determine IGF-I, protein, DNA and triglycerides; pancreas to determine IGF-I, protein and DNA; pituitary to determine GH; stomach to determine of ghrelin, protein and DNA and epididymal adipose tissue to determine leptin, protein and DNA. In addition to body weight and length, experimental diabetes also reduced blood concentrations of insulin, leptin, GH and IGF-I. Nevertheless, it increased water and food intake, and also the concentrations of triglycerides, blood glucose and acylated ghrelin. In diabetic rats, exercise caused a reduction of food intake, blood concentrations of glucose and triglycerides, and recovery blood IGF-I. In the liver, diabetes reduced the IGF-I, protein and protein/DNA ratio values, and increased triglycerides level, which was recovered by physical training in these parameters. Diabetes also reduced pituitary GH concentrations, which did not alter by physical training. On the other hand, training increased IGF-I and protein / DNA ratio values... (Complete abstract click electronic access below)
Descrição
Palavras-chave
Patologia, Diabetes, Fome, Respostas endócrino-metabólicas, Exercício crônico, IGF-I, Diabetes Mellitus, Physical Training, Ghrelin, Leptin
Como citar
LEME, José Alexandre Curiacos de Almeida. Efeitos do treinamento físico moderado nas concentrações de grelina, leptina e no eixo GH-IGF em ratos diabéticos. 2010. 97 f. Tese (doutorado) - Universidade Estadual Paulista, Instituto de Biociências de Rio Claro, 2010.