Published in:
01-01-2016 | Original Article
Effect of regional muscle location but not adiposity on mitochondrial biogenesis-regulating proteins
Authors:
Jesús Gustavo Ponce-González, Ignacio Ara, Steen Larsen, Borja Guerra, Jose A. L. Calbet, Jørn Wulff Helge
Published in:
European Journal of Applied Physiology
|
Issue 1/2016
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Abstract
Purpose
The aim of this study was to determine if the expression of the mitochondrial biogenesis-regulating proteins SIRT1, SIRT3 and PGC-1alpha in human skeletal muscle is influenced by adiposity.
Method
Twenty-nine male subjects were recruited into three groups: control (n = 10), obese (n = 10) and post-obese (n = 9). Intentionally, groups were matched by age, aerobic capacity and in addition the control and post-obese groups also by BMI. Muscle biopsies were obtained from the m. deltoid and vastus lateralis. PGC-1alpha, SIRT1 and SIRT3 protein expression was analyzed by Western blot.
Result
PGC-1alpha, SIRT1 and SIRT3 protein expression was similar regardless of the level of adiposity. Only a main effect of group on SIRT1 protein showed a trend toward higher expression in post-obese than control and obese (P = 0.09). Despite similar muscle fiber-type composition (previously reported), PGC-1alpha, SIRT1 and SIRT3 protein expression was higher in leg compared to arm muscle in all groups (P < 0.05).
Conclusion
This study shows that PGC-1alpha, SIRT1 and SIRT3 protein expression in basal conditions was not altered in humans with different levels of adiposity but similar aerobic capacity. The expression of PGC-1alpha, SIRT1 and SIRT3 was higher in vastus lateralis than in deltoid muscle, indicating that local rather than systemic factors prevail in regulating the level of expression of these proteins.