Efeito do treinamento resistido na densidade mineral óssea e no conteúdo de GLUT4 em ratos diabéticos (tipo 2) osteopênicos
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2013-06-05
Autores
Yamamoto, Aline Pedro de Melo [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
O diabetes melittus (DM) é considerado um importante problema na saúde pública em vários países do mundo, pois além de estar em ascendente prevalência, compromete tanto a produtividade quanto a qualidade de vida e sobrevida dos seus portadores. Sua principal característica é a presença de hiperglicemia crônica decorrente de defeitos na secreção e/ou ação da insulina. A literatura tem mostrado uma associação de DM com redução da massa óssea. Contudo, os mecanismos de mudanças da densidade mineral óssea (DMO) nesses pacientes diabéticos ainda não estão claros. Portanto, o objetivo deste estudo foi investigar o efeito do treinamento resistido (TR) sobre a DMO, as propriedades biomecânicas do osso, glicemia, calcemia, fosfatemia, a sensibilidade à insulina e a expressão de GLUT4 em ratos osteopênicos com diabetes tipo 2 (DM2). Para tanto, foram utilizados 64 ratos machos (5 dias de idade) divididos em dois grandes grupos: grupo controle (CN), que recebeu injeção de veículo (tampão citrato 10 mmol/L, pH 4.5 i.p.) e grupo diabético (DM), que recebeu injeção de estreptozotocina (150 mg/kg i.p.). Após 55 dias, foi mensurada a glicose de cada animal utilizando o monitor (Accu-Chek Advantage, Roche Diagnostics, Indianapolis, IN) para verificar se os animais do grupo DM estavam diabéticos. Apenas os ratos do grupo DM com glicose acima de 200mg/dl foram utilizados no experimento. Logo em seguida, todos os animais foram anestesiados com cloridrato de quetamina (80 mg/kg de peso corporal, i.m) e xilazina (10 mg/kg de peso corporal, i.m) para realizar a primeira análise densitométrica (AD) (pré-suspensão) da tíbia direita por emissões de absorciometria de raios-X (DXA), do aparelho DPX (Lunar DPX Alpha, WI, USA). Em seguida, esses grupos foram subdivididos em quatro grupos: CN, controle osteopênicos (CO), DM e diabéticos...
Diabetes mellitus (DM) is considered an important public health problem in many countries of the world, because, besides being in ascending prevalence, it commits the productivity, the quality of life and survival of their bearers. Its main characteristic is the presence of chronic hyperglycemia due to defects in secretion and/or insulin action. The literature has shown an association between DM and reduced bone mass. However, the mechanisms of change in bone mineral density (BMD) in these diabetic patients are still unclear. Therefore, the aim of this study was to investigate the effect of resistance training (RT) on BMD, bone biomechanical properties, glycemia, calcemia and phosphatemia, insulin sensitivity and GLUT4 expression in osteopenic rats with type 2 diabetes (DM2). Thus, we used 64 male rats (5 days old) divided into two groups: control (CN), which received an injection of vehicle (citrate buffer 10 mmol/L, pH 4.5 i.p.) and diabetic (DM), which received an injection of streptozotocin (150 mg/kg i.p). After 55 days, glucose was measured in each animal using the monitor (Accu-Chek Advantage, Roche Diagnostics, Indianapolis, IN) to verify if animals of DM group were diabetic. Only diabetic group rats with glucose above 200mg/dl were used in the experiment. After that all animals were anesthetized with ketamine (80 mg/kg body weight, i.m) and xylazine (10 mg/kg bodyweight i.m) so that the first densitometric analysis (DA) (pre-suspension) of the right tibia by dual X-ray absorptiometry emissions (DXA), from apparatus DPX (Lunar DPX Alpha, WI, USA) was performed. Then, these groups were subdivided into four groups: CN, osteopenic control (OC), DM and osteopenic diabetic (OD). Animals in groups OC and OD were suspended by their tails for a period of 21 days to promote osteopenia in hindlimb. Thereafter, the second DA (post-suspension)...
Diabetes mellitus (DM) is considered an important public health problem in many countries of the world, because, besides being in ascending prevalence, it commits the productivity, the quality of life and survival of their bearers. Its main characteristic is the presence of chronic hyperglycemia due to defects in secretion and/or insulin action. The literature has shown an association between DM and reduced bone mass. However, the mechanisms of change in bone mineral density (BMD) in these diabetic patients are still unclear. Therefore, the aim of this study was to investigate the effect of resistance training (RT) on BMD, bone biomechanical properties, glycemia, calcemia and phosphatemia, insulin sensitivity and GLUT4 expression in osteopenic rats with type 2 diabetes (DM2). Thus, we used 64 male rats (5 days old) divided into two groups: control (CN), which received an injection of vehicle (citrate buffer 10 mmol/L, pH 4.5 i.p.) and diabetic (DM), which received an injection of streptozotocin (150 mg/kg i.p). After 55 days, glucose was measured in each animal using the monitor (Accu-Chek Advantage, Roche Diagnostics, Indianapolis, IN) to verify if animals of DM group were diabetic. Only diabetic group rats with glucose above 200mg/dl were used in the experiment. After that all animals were anesthetized with ketamine (80 mg/kg body weight, i.m) and xylazine (10 mg/kg bodyweight i.m) so that the first densitometric analysis (DA) (pre-suspension) of the right tibia by dual X-ray absorptiometry emissions (DXA), from apparatus DPX (Lunar DPX Alpha, WI, USA) was performed. Then, these groups were subdivided into four groups: CN, osteopenic control (OC), DM and osteopenic diabetic (OD). Animals in groups OC and OD were suspended by their tails for a period of 21 days to promote osteopenia in hindlimb. Thereafter, the second DA (post-suspension)...
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Palavras-chave
Densidade óssea, Diabetes, Exercicios, Doenças ósseas metabólicas, Fraturas ósseas, Insulina, Bone density
Como citar
YAMAMOTO, Aline Pedro de Melo. Efeito do treinamento resistido na densidade mineral óssea e no conteúdo de GLUT4 em ratos diabéticos (tipo 2) osteopênicos. 2013. 71 f. Dissertação (mestrado) - Universidade Estadual Paulista Júlio de Mesquita Filho, Faculdade de Odontologia de Araçatuba, 2013.