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首页> 外文期刊>Journal of Theoretical Biology >Increased entropy production in diaphragm muscle of PPAR alpha knockout mice
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Increased entropy production in diaphragm muscle of PPAR alpha knockout mice

机译:增加PPAR alpha基因敲除小鼠的diaphragm肌的熵产生

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Peroxisome proliferator activated receptor alpha (PPAR alpha) regulates fatty acid beta-oxidation (FAO) and plays a central role in the metabolic and energetic homeostasis of striated muscles. The thermodynamic consequences of the absence of PPAR alpha were investigated in diaphragm muscle of PPAR alpha knockout mice (KO). Statistical mechanics provides a powerful tool for determining entropy production, which quantifies irreversible chemical processes generated by myosin molecular motors and which is the product of thermodynamic force A/T (chemical affinity A and temperature 7) and thermodynamic flow (myosin crossbridge (CB) cycle velocity nu). The behavior of both wild type (WT) and KO diaphragm was shown to be near-equilibrium and in a stationary state, but KO was farther from equilibrium than WT. In KO diaphragm, a substantial decrease in contractile function was associated with an increase in both A/T and nu and with profound histological injuries such as contraction band necrosis. There were no changes in PPAR delta and gamma expression levels or myosin heavy chain (MHC) patterns. In KO diaphragm, a marked increase in entropy production (A/T x nu) accounted for major thermodynamic dysfunction and a dramatic increase in irreversible chemical processes during the myosin CB cycle. (C) 2007 Elsevier Ltd. All rights reserved.
机译:过氧化物酶体增殖物激活受体α(PPARα)调节脂肪酸β-氧化(FAO),并在横纹肌的代谢和能量稳态中发挥核心作用。在PPARα基因敲除小鼠(KO)的diaphragm肌中研究了缺少PPARα的热力学后果。统计力学为确定熵的产生提供了强大的工具,它量化了肌球蛋白分子马达产生的不可逆化学过程,并且是热力学力A ​​/ T(化学亲和力A和温度7)和热力学流(肌球蛋白跨桥(CB)循环)的乘积速度nu)。野生型(WT)和KO隔膜的行为均显示为接近平衡且处于稳定状态,但KO比WT更远离平衡。在KO隔膜中,收缩功能的实质性降低与A / T和nu的升高有关,并与诸如收缩带坏死等深刻的组织学损伤有关。 PPARδ和γ表达水平或肌球蛋白重链(MHC)模式没有变化。在KO隔膜中,熵产生(A / T x nu)的显着增加是肌球蛋白CB循环过程中主要的热力学功能障碍和不可逆化学过程的急剧增加的原因。 (C)2007 Elsevier Ltd.保留所有权利。

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