(L773:0012 1797 OR L773:1939 327X) srt2:(2005-2009)
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Exercise-induced phosphorylation of the novel Akt substrates AS160 and filamin A in human skeletal muscle
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- Deshmukh, A (author)
- Karolinska Institutet
- Coffey, VG (author)
- Zhong, ZH (author)
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- Hawley, JA (author)
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- (creator_code:org_t)
- American Diabetes Association, 2006
- 2006
- English.
- In: Diabetes. - : American Diabetes Association. - 0012-1797 .- 1939-327X. ; 55:6, s. 1776-1782
- Journal article (peer-reviewed)
Abstract
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- Skeletal muscle contraction stimulates multiple signaling cascades that govern a variety of metabolic and transcriptional events. Akt/protein kinase B regulates metabolism and growth/muscle hypertrophy, but contraction effects on this target and its substrates are varied and may depend on the mode of the contractile stimulus. Accordingly, we determined the effects of endurance or resistance exercise on phosphorylation of Akt and downstream substrates in six trained cyclists who performed a single bout of endurance or resistance exercise separated by ∼7 days. Muscle biopsies were taken from the vastus lateralis at rest and immediately after exercise. Akt Ser473 phosphorylation was increased (1.8-fold; P = 0.011) after endurance but was unchanged after resistance exercise. Conversely, Akt Thr308 phosphorylation was unaltered after either bout of exercise. Several exercise-responsive phosphoproteins were detected by immunoblot analysis with a phospho-Akt substrate antibody. pp160 and pp300 were identified as AS160 and filamin A, respectively, with increased phosphorylation (2.0- and 4.9-fold, respectively; P < 0.05) after endurance but not resistance exercise. In conclusion, AS160 and filamin A may provide an important link to mediate endurance exercise–induced bioeffects in skeletal muscle.
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- Deshmukh, A
- Coffey, VG
- Zhong, ZH
- Chibalin, AV
- Hawley, JA
- Zierath, JR
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- Diabetes
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- Karolinska Institutet
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