Akt substrate of 160 kDa (AS160/TBC1D4) is associated with insulin and contraction-mediated glucose uptake. Human skeletal muscle AS160 phosphorylation is increased during aerobic exercise but not immediately following resistance exercise. It is not known whether AS160 phosphorylation is altered during recovery from resistance exercise. Therefore, we hypothesized that muscle AS160/TBC1D4 phosphorylation and glucose uptake across the leg would be increased during recovery following resistance exercise. We studied 9 male subjects before, during, and for 2 h of postexercise recovery. We utilized femoral catheterizations and muscle biopsies in combination with indirect calorimetry and immunoblotting to determine whole body glucose and fat oxidation, leg glucose uptake, muscle AMPKα2 activity, and the phosphorylation of muscle Akt and AS160/TBC1D4. Glucose oxidation was reduced while fat oxidation increased (∼35%) during postexercise recovery ( P ≤ 0.05). Glucose uptake increased during exercise and postexercise recovery ( P ≤ 0.05). Akt phosphorylation was increased at 1 h and AMPKα2 activity increased at 2 h postexercise ( P ≤ 0.05). Phospho(Ser/Thr)-Akt substrate (PAS) phosphorylation (often used as a marker for AS160) was unchanged immediately postexercise and increased at 1 h ( P ≤ 0.05) and 2 h postexercise ( P = 0.07). The PAS antibody is not always specific for AS160/TBC1D4 and can detect proteins at a similar molecular weight. Therefore, we immunoprecipitated AS160/TBC1D4 and then blotted with the PAS antibody, which confirmed that PAS phosphorylation is occurring on AS160/TBC1D4. There was also a positive correlation between PAS phosphorylation and leg glucose uptake during recovery ( P < 0.05). We conclude that resistance exercise increases AS160/TBC1D4 phosphorylation in association with an increase in leg glucose uptake during postexercise recovery. AMP-activated protein kinase; fat oxidation; GLUT4; Akt Address for reprint requests and other correspondence: B. B. Rasmussen, Univ. of Texas Medical Branch, Dept. of Physical Therapy, Division of Rehabilitation Sciences, 301 Univ. Blvd., Galveston, TX 77555-1144 (e-mail: email@example.com )
Journal of Applied Physiology – The American Physiological Society
Published: Dec 1, 2008
It’s your single place to instantly
discover and read the research
that matters to you.
Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.
All for just $49/month
Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly
Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.
Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.
Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.
All the latest content is available, no embargo periods.
“Hi guys, I cannot tell you how much I love this resource. Incredible. I really believe you've hit the nail on the head with this site in regards to solving the research-purchase issue.”Daniel C.
“Whoa! It’s like Spotify but for academic articles.”@Phil_Robichaud
“I must say, @deepdyve is a fabulous solution to the independent researcher's problem of #access to #information.”@deepthiw
“My last article couldn't be possible without the platform @deepdyve that makes journal papers cheaper.”@JoseServera