Effect of Mild Intermittent Hypoxia on Glucose Tolerance, Muscle Morphology and AMPK-PGC-1α Signaling

10.4077/CJP.2010.AMK078

Chung-Yu Chen；Ying-Lan Tsai；Chung-Lan Kao；Shin-Da Lee；Ming-Chieh Wu；Mallikarjuna K；Yi-Hung Liao；John L. Ivy；Chia-Hua Kuo

hypoxia ； obesity ； insulin resistance ； AMPK ； angiogenesis

The Chinese Journal of Physiology

53卷1期（2010 / 02 / 28）

62 - 71

英文

The main goal of this studs as to investigate the long-term effect of daily 8-hour mild intermittent hypoxia (14-15% O2) on glucose tolerance and muscle morphology of Sprague-Dale rats. The involvement of AMPK-PGC-1α-VEGF signaling pathways in the skeletal muscle as also determined during the first 8 hours of hypoxia. We found that mRNA levels of VEGF and PGC-1α were significantly increased above control after 8-h mild hypoxia without a change in AMPK phosphorylation. After 8 weeks of mild intermittent hypoxia treatment, plasma glucose and insulin levels in oral glucose tolerance test (OGTT), epididymal fat mass, and both weight were significantly lower compared to the control group. While soleus muscle weight as not changed, capillary and fiber densities in the hypoxia group were 33% and 35% above the control suggesting reorganization of muscle fibers. In conclusion, our data provide strong evidence that long-term mild intermittent hypoxia decreases the diffusion distance of glucose and insulin across muscle fibers, and decreases adiposity in rats. These changes ma account for the improved glucose tolerance observed following the 8-eek hypoxia treatment, and provides grounds for investigating the development of a mild non-pharmacological intervention in the treatment of obesity and type 2 diabetes.

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