TY - JOUR
T1 - Endurance exercise increases the SIRT1 and peroxisome proliferator-activated receptor γ coactivator-1α protein expressions in rat skeletal muscle
AU - Suwa, Masataka
AU - Nakano, Hiroshi
AU - Radak, Zsolt
AU - Kumagai, Shuzo
N1 - Funding Information:
This work was supported by a Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology of Japan (no. 16300209) to SK. MS was supported by Research Fellowships of the Japan Society for the Promotion of Science for Young Scientists.
PY - 2008/7
Y1 - 2008/7
N2 - Peroxisome proliferator-activated receptor γ coactivator-1α (PGC-1α) is considered to play a pivotal role in the exercise-induced metabolic adaptation of skeletal muscle. Although the oxidized form of nicotinamide adenine dinucloetide (NAD+)-dependent histone deacetylase SIRT1 has been shown to mediate PGC-1α-induced metabolic adaptation, the effect of endurance exercise on the SIRT1 protein remains to be elucidated. The purposes of this study were (1) to investigate the distribution of SIRT1 and PGC-1α proteins in skeletal muscle and (2) to examine the effects of acute endurance exercise and low- or high-intensity exercise training on SIRT1 and PGC-1α protein expressions and on the metabolic components in rat skeletal muscle. Both the SIRT1 and PGC-1α proteins preferentially accumulate in red oxidative muscles. Acute endurance exercise on a motor-driven treadmill (20 m/min, 18.5% incline, 45 minutes) increases the PGC-1α protein expression at 18 hours after exercise and the SIRT1 protein expression at 2 hours after exercise in the soleus muscle. In the training experiment, the rats were divided into control, low-intensity (20 m/min, 18.5% incline, 90 min/d), and high-intensity (30 m/min, 18.5% incline, 60 min/d) training groups. After 14 days of training, the SIRT1 and PGC-1α proteins, hexokinase activity, mitochondrial proteins and enzyme activities, and glucose transporter 4 protein in the soleus muscle were increased by both trainings. In the plantaris muscle, SIRT1, hexokinase activity, mitochondrial proteins and enzyme activities, and glucose transporter 4 were increased by high-intensity training whereas the PGC-1α was not. These results suggest that endurance exercise increases the skeletal muscle SIRT1 protein content. In addition, the findings also raise the possibility that the SIRT1 protein expression may play a potentially important role in such adaptations, whereas an increase in the PGC-1α protein expression is not necessary for such adaptations.
AB - Peroxisome proliferator-activated receptor γ coactivator-1α (PGC-1α) is considered to play a pivotal role in the exercise-induced metabolic adaptation of skeletal muscle. Although the oxidized form of nicotinamide adenine dinucloetide (NAD+)-dependent histone deacetylase SIRT1 has been shown to mediate PGC-1α-induced metabolic adaptation, the effect of endurance exercise on the SIRT1 protein remains to be elucidated. The purposes of this study were (1) to investigate the distribution of SIRT1 and PGC-1α proteins in skeletal muscle and (2) to examine the effects of acute endurance exercise and low- or high-intensity exercise training on SIRT1 and PGC-1α protein expressions and on the metabolic components in rat skeletal muscle. Both the SIRT1 and PGC-1α proteins preferentially accumulate in red oxidative muscles. Acute endurance exercise on a motor-driven treadmill (20 m/min, 18.5% incline, 45 minutes) increases the PGC-1α protein expression at 18 hours after exercise and the SIRT1 protein expression at 2 hours after exercise in the soleus muscle. In the training experiment, the rats were divided into control, low-intensity (20 m/min, 18.5% incline, 90 min/d), and high-intensity (30 m/min, 18.5% incline, 60 min/d) training groups. After 14 days of training, the SIRT1 and PGC-1α proteins, hexokinase activity, mitochondrial proteins and enzyme activities, and glucose transporter 4 protein in the soleus muscle were increased by both trainings. In the plantaris muscle, SIRT1, hexokinase activity, mitochondrial proteins and enzyme activities, and glucose transporter 4 were increased by high-intensity training whereas the PGC-1α was not. These results suggest that endurance exercise increases the skeletal muscle SIRT1 protein content. In addition, the findings also raise the possibility that the SIRT1 protein expression may play a potentially important role in such adaptations, whereas an increase in the PGC-1α protein expression is not necessary for such adaptations.
UR - http://www.scopus.com/inward/record.url?scp=44949188628&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=44949188628&partnerID=8YFLogxK
U2 - 10.1016/j.metabol.2008.02.017
DO - 10.1016/j.metabol.2008.02.017
M3 - Article
C2 - 18555842
AN - SCOPUS:44949188628
SN - 0026-0495
VL - 57
SP - 986
EP - 998
JO - Metabolism: Clinical and Experimental
JF - Metabolism: Clinical and Experimental
IS - 7
ER -
