5 运动适应中的代谢调控
从p53对能量代谢的选择性调控来看,p53+/+可通过SCO2的转录调控促进线粒体有氧氧化,同时通过TIGAR的转录调控抑制糖酵解,将细胞能量代谢导向有氧氧化方向,p53/、p53沉默或突变则相反。糖酵解与有氧氧化是不同的ATP合成方式,这种不同不仅在于ADP的磷酸化方式不同,更在于底物选择上的不同。糖和脂肪是线粒体有氧氧化合成ATP的主要底物,但糖的有氧氧化须经历糖酵解途径,p53+/+抑制糖酵解,促进有氧氧化,意味着这种有氧氧化的底物很大程度上只能是脂肪。换句话说,p53+/+有着节省糖原、消耗脂肪的良好效用,长期有氧训练可以使机体能量代谢出现糖原节省化现象。
运动能力下降是衰老功能的表现之一,能量代谢是运动能力的基本保障,同时运动也是改善能量代谢的最有效手段,我们相信p53很可能是其中重要的分子衔接。
【参考文献】(p53信号稳态调节线粒体能量代谢延缓衰老的运动适应)
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