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The effects of PGC-1alpha on control of micro vascular Po_2 kinetics following onset of muscle contractions

机译:PGC-1alpha对控制肌肉收缩后微血管Po_2动力学的影响

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Peroxisome proliferator-activated receptor gamma coactivator la (PGC-la) is increased by endurance training (26, 43), and its upregulation improves endurance performance due to mito-chondrial biogenesis, a fiber-type switch to oxidative fibers, and angiogenesis in skeletal muscle (2, 14, 43, 62). We have previously investigated alterations of skeletal muscle metabolism induced by muscle-specific overexpression of PGC-la in skeletal muscle that lead to increase in peak O_2 uptake and exercise capacity (55). However, nothing is known regarding the impact of PGC-1alpha overexpression on the dynamics of the Pmvo_2 during contractions. It is expected that the improved endurance capacity of PGC-la mice is a consequence of improved aerobic metabolism especially in fast-twitch muscle. Therefore, based upon the exercise training responses of Hirai et al. (24) we tested the hypothesis that genetic overexpression of PGC-la would slow the Pmvo_2 kinetics profile and raise steady-state Pmvo_2 of the fast-twitch (white) gastrocnemius during contractions to resemble that profile found in slow-twitch muscles.
机译:通过耐力训练增加了过氧化物酶体增殖物激活的受体γ共激活子Ia(PGC-la)(26,43),并且由于线粒体的生物发生,纤维类型向氧化纤维的转换以及骨骼的血管生成,其上调改善了耐力性能肌肉(2、14、43、62)。我们以前曾研究过骨骼肌中PGC-1a的肌肉特异性过表达引起的骨骼肌代谢改变,这些改变导致峰值O_2摄取和运动能力增加(55)。但是,关于PGC-1alpha过度表达对收缩过程中Pmvo_2动力学的影响,我们一无所知。可以预期,PGC-1a小鼠的耐力提高是有氧代谢提高的结果,尤其是在快速抽搐的肌肉中。因此,基于平井等人的运动训练反应。 (24)我们检验了以下假设:遗传上PGC-1a的过度表达会减慢快肌(白色)腓肠肌的Pmvo_2动力学曲线,并使其稳态Pmvo_2升高,从而类似于慢肌中发现的这种曲线。

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