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Effects of Fibre Type and Diffusion Distance on Mouse Skeletal Muscle Glycogen Content In Vitro

机译:纤维类型和扩散距离对小鼠骨骼肌糖原原含量的影响

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摘要

In vitro incubation of isolated rodent skeletal muscle is a widely used procedure in metabolic research. One concern with this method is the development of an anoxic state during the incubation period that can cause muscle glycogen depletion. Our aim was to investigate whether in vitro incubation conditions influence glycogen concentration in glycolytic extensor digitorum longus (EDL) and oxidative soleus mouse muscle. Quantitative immunohistochemistry was applied to assess glycogen content in incubated skeletal muscle. Glycogen concentration was depleted, independent of insulin-stimulation in the incubated skeletal muscle. The extent of glycogen depletion was correlated with the oxidative fibre distribution and with the induction of hypoxia-induced-factor-1-alpha. Insulin exposure partially prevented glycogen depletion in soleus, but not in EDL muscle, providing evidence that glucose diffusion is not a limiting step to maintain glycogen content. Our results provide evidence to suggest that the anoxic milieu and the intrinsic characteristics of the skeletal muscle fibre type play a major role in inducing glycogen depletion in during in vitro incubations.
机译:离体啮齿动物骨骼肌的体外孵育是代谢研究中广泛使用的程序。该方法的一个关注点是在潜伏期出现缺氧状态,该状态可引起肌肉糖原耗竭。我们的目的是研究体外培养条件是否会影响糖原性伸指长肌(EDL)和比目鱼的氧化比目鱼肌肉中的糖原浓度。定量免疫组织化学用于评估培养的骨骼肌中糖原含量。糖原浓度被耗尽,独立于孵育的骨骼肌中的胰岛素刺激。糖原消耗的程度与氧化纤维分布和缺氧诱导因子-1-α的诱导相关。胰岛素暴露部分阻止了比目鱼肌中糖原的消耗,但不能阻止EDL肌肉中的糖原消耗,这表明葡萄糖扩散不是维持糖原含量的限制步骤。我们的结果提供证据表明缺氧环境和骨骼肌纤维类型的内在特征在体外培养过程中在诱导糖原消耗中起主要作用。

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