Yanai Hidekatsu, Watanabe Ichiro, Ishii Kojiro, Morimoto Mie, Fujiwara Hironobu, Yoshida Shigeru, Hui Shu-Ping, Matsuno Kazuhiko, Chiba Hitoshi
Department of Laboratory Medicine, Hokkaido University School of Medicine, Sapporo 060-8648, Japan.
J Med Genet. 2007 Jul;44(7):445-7. doi: 10.1136/jmg.2007.050070. Epub 2007 Apr 5.
An important role of CD36 in muscle fatty acid (FA) uptake has been shown in CD36-knockout or CD36-overexpressed mice. FA is a predominant substrate in energy production during light exercise below the anaerobic threshold (AT). We studied whether aerobic exercise capacity in humans could be affected by CD36 deficiency.
We investigated the ventilatory threshold (VT) and serum FA changes in normal participants (n = 22) and participants with CD36 deficiency (n = 12) during pedalling on a cycle ergometer.
In participants with CD36 deficiency, FA levels were not reduced at peak work rate, whereas FA levels decreased by about 50% in normal participants. Participants with CD36 deficiency showed significantly lower VT than normal participants. A significant correlation was observed between VT and percentage changes in FA at peak work rate.
This study found reduced FA utilisation and an attenuated aerobic exercise capacity in CD36 deficiency, indicating that CD36-mediated FA oxidation is an important determinant for aerobic exercise capacity in humans.
在CD36基因敲除或CD36过表达的小鼠中,已证实CD36在肌肉脂肪酸(FA)摄取中起重要作用。在低于无氧阈值(AT)的轻度运动期间,FA是能量产生的主要底物。我们研究了人类的有氧运动能力是否会受到CD36缺乏的影响。
我们调查了正常参与者(n = 22)和CD36缺乏参与者(n = 12)在蹬踩自行车测力计过程中的通气阈值(VT)和血清FA变化。
在CD36缺乏的参与者中,峰值工作率时FA水平未降低,而正常参与者的FA水平下降了约50%。CD36缺乏的参与者的VT显著低于正常参与者。在峰值工作率时,观察到VT与FA百分比变化之间存在显著相关性。
本研究发现CD36缺乏时FA利用减少且有氧运动能力减弱,表明CD36介导的FA氧化是人类有氧运动能力的重要决定因素。