Abstract
A recent study identified ursolic acid (UA) as a potent stimulator of muscle protein anabolism via PI3K/Akt signaling, thereby suggesting that UA can increase Akt-independent mTOR complex 1 (mTORC1) activation induced by resistance exercise via Akt signaling. The purpose of the present study was to investigate the effect of UA on resistance exercise-induced mTORC1 activation. The right gastrocnemius muscle of male Sprague-Dawley rats aged 11 wk was isometrically exercised via percutaneous electrical stimulation (stimulating ten 3-s contractions per set for 5 sets), while the left gastrocnemius muscle served as the control. UA or placebo (PLA; corn oil only) was injected intraperitoneally immediately after exercise. The rats were killed 1 or 6 h after the completion of exercise and the target tissues removed immediately. With placebo injection, the phosphorylation of p70S6K at Thr389 increased 1 h after resistance exercise but attenuated to the control levels 6 h after the exercise. On the other hand, the augmented phosphorylation of p70S6K was maintained even 6 h after exercise when UA was injected immediately after exercise. A similar trend of prolonged phosphorylation was observed in PRAS40 Thr246, whereas UA alone or resistance exercise alone did not alter its phosphorylation level at 6 h after intervention. These results indicate that UA is able to sustain resistance exercise-induced mTORC1 activity.
| Original language | English |
|---|---|
| Journal | American Journal of Physiology - Endocrinology and Metabolism |
| Volume | 305 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - 2013 Sep |
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Keywords
- Exercise
- Intracellular signaling
- Muscle hypertrophy
- Nutrition
- Supplement
ASJC Scopus subject areas
- Physiology
- Physiology (medical)
- Endocrinology, Diabetes and Metabolism
Cite this
Ursolic acid stimulates mTORC1 signaling after resistance exercise in rat skeletal muscle. / Ogasawara, Riki; Sato, Koji; Higashida, Kazuhiko; Nakazato, Koichi; Fujita, Satoshi.
In: American Journal of Physiology - Endocrinology and Metabolism, Vol. 305, No. 6, 09.2013.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Ursolic acid stimulates mTORC1 signaling after resistance exercise in rat skeletal muscle
AU - Ogasawara, Riki
AU - Sato, Koji
AU - Higashida, Kazuhiko
AU - Nakazato, Koichi
AU - Fujita, Satoshi
PY - 2013/9
Y1 - 2013/9
N2 - A recent study identified ursolic acid (UA) as a potent stimulator of muscle protein anabolism via PI3K/Akt signaling, thereby suggesting that UA can increase Akt-independent mTOR complex 1 (mTORC1) activation induced by resistance exercise via Akt signaling. The purpose of the present study was to investigate the effect of UA on resistance exercise-induced mTORC1 activation. The right gastrocnemius muscle of male Sprague-Dawley rats aged 11 wk was isometrically exercised via percutaneous electrical stimulation (stimulating ten 3-s contractions per set for 5 sets), while the left gastrocnemius muscle served as the control. UA or placebo (PLA; corn oil only) was injected intraperitoneally immediately after exercise. The rats were killed 1 or 6 h after the completion of exercise and the target tissues removed immediately. With placebo injection, the phosphorylation of p70S6K at Thr389 increased 1 h after resistance exercise but attenuated to the control levels 6 h after the exercise. On the other hand, the augmented phosphorylation of p70S6K was maintained even 6 h after exercise when UA was injected immediately after exercise. A similar trend of prolonged phosphorylation was observed in PRAS40 Thr246, whereas UA alone or resistance exercise alone did not alter its phosphorylation level at 6 h after intervention. These results indicate that UA is able to sustain resistance exercise-induced mTORC1 activity.
AB - A recent study identified ursolic acid (UA) as a potent stimulator of muscle protein anabolism via PI3K/Akt signaling, thereby suggesting that UA can increase Akt-independent mTOR complex 1 (mTORC1) activation induced by resistance exercise via Akt signaling. The purpose of the present study was to investigate the effect of UA on resistance exercise-induced mTORC1 activation. The right gastrocnemius muscle of male Sprague-Dawley rats aged 11 wk was isometrically exercised via percutaneous electrical stimulation (stimulating ten 3-s contractions per set for 5 sets), while the left gastrocnemius muscle served as the control. UA or placebo (PLA; corn oil only) was injected intraperitoneally immediately after exercise. The rats were killed 1 or 6 h after the completion of exercise and the target tissues removed immediately. With placebo injection, the phosphorylation of p70S6K at Thr389 increased 1 h after resistance exercise but attenuated to the control levels 6 h after the exercise. On the other hand, the augmented phosphorylation of p70S6K was maintained even 6 h after exercise when UA was injected immediately after exercise. A similar trend of prolonged phosphorylation was observed in PRAS40 Thr246, whereas UA alone or resistance exercise alone did not alter its phosphorylation level at 6 h after intervention. These results indicate that UA is able to sustain resistance exercise-induced mTORC1 activity.
KW - Exercise
KW - Intracellular signaling
KW - Muscle hypertrophy
KW - Nutrition
KW - Supplement
UR - http://www.scopus.com/inward/record.url?scp=84884377447&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84884377447&partnerID=8YFLogxK
U2 - 10.1152/ajpendo.00302.2013
DO - 10.1152/ajpendo.00302.2013
M3 - Article
C2 - 23900420
AN - SCOPUS:84884377447
VL - 305
JO - American Journal of Physiology
JF - American Journal of Physiology
SN - 0193-1849
IS - 6
ER -