کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1939933 1050770 2006 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Oral glucose ingestion attenuates exercise-induced activation of 5′-AMP-activated protein kinase in human skeletal muscle
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی زیست شیمی
پیش نمایش صفحه اول مقاله
Oral glucose ingestion attenuates exercise-induced activation of 5′-AMP-activated protein kinase in human skeletal muscle
چکیده انگلیسی

5′-AMP-activated protein kinase (AMPK) has been suggested to be a ‘metabolic master switch’ regulating various aspects of muscle glucose and fat metabolism. In isolated rat skeletal muscle, glucose suppresses the activity of AMPK and in human muscle glycogen loading decreases exercise-induced AMPK activation. We hypothesized that oral glucose ingestion during exercise would attenuate muscle AMPK activation. Nine male subjects performed two bouts of one-legged knee-extensor exercise at 60% of maximal workload. The subjects were randomly assigned to either consume a glucose containing drink or a placebo drink during the two trials. Muscle biopsies were taken from the vastus lateralis before and after 2 h of exercise. Plasma glucose was higher (6.0 ± 0.2 vs. 4.9 ± 0.1 mmol L−1, P < 0.001), whereas glycerol (44.8 ± 7.8 vs. 165.7 ± 22.3 μmol L−1), and free fatty acid (169.3 ± 9.5 vs. 1161 ± 144.9 μmol L−1) concentrations were lower during the glucose compared to the placebo trial (both P < 0.001). Calculated fat oxidation was lower during the glucose trial (0.17 ± 0.02 vs. 0.25 ± 0.03 g min−1, P < 0.001). Activation of α2-AMPK was attenuated in the glucose trial compared to the placebo trial (0.24 ± 0.07 vs. 0.46 ± 0.14 pmol mg−1 min−1, P = 0.03), whereas the α1-AMPK activity was not different between trials or affected by exercise. AMPK and the downstream target of AMPK, acetyl-CoA carboxylase-β, were phosphorylated as a response to exercise, but neither was significantly different between the two trials. We conclude that oral glucose ingestion attenuates the exercise-induced activation of α2-AMPK, bringing further support for a fuel-sensing role of AMPK in skeletal muscle.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biochemical and Biophysical Research Communications - Volume 342, Issue 3, 14 April 2006, Pages 949–955
نویسندگان
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