Cited by 273Metabolism, Diabetes, and CancerPI3K/AKT/mTOR signaling in cancerMuscle Physiology and Disorders

Increased Phosphorylation of Akt Substrate of 160 kDa (AS160) in Rat Skeletal Muscle in Response to Insulin or Contractile Activity

Bruss, Matthew D., Arias, Edward B., Lienhard, Gustav E., Cartee, Gregory D.·2005·Diabetes

Abstract

In 3T3-L1 adipocytes, insulin-stimulated GLUT4 translocation requires phosphorylation of the protein designated Akt substrate of 160 kDa (AS160). Both insulin and contractions activate Akt in skeletal muscle. Therefore, we assessed the effects in skeletal muscle of each stimulus on phosphorylation of proteins, including AS160, on the Akt phosphomotif. Isolated rat epitrochlearis muscles were incubated with insulin (for time course and dose response), stimulated to contract, or incubated with 5-aminoimidazole-4-carboxamide-1-β-d-ribofuranoside (AICAR) and used to assess the following: serine-phosphorylation of Akt (P-Akt), immunoreactivity with an antibody recognizing the Akt phosphomotif (α-phospho-[Ser/Thr] Akt substrate [PAS]), and PAS immunoreactivity of samples immunoprecipitated with anti-AS160. P-Akt peaked at 5 min of insulin, and PAS immunoreactivity subsequently peaked for proteins of 250 kDa (10 min) and 160 kDa (15 min). P-Akt, PAS-160, and PAS-250 increased significantly with 0.6 nmol/l insulin. Contractile activity led to increased P-Akt and PAS immunoreactivity of proteins of 160 and 250 kDa. The 160-kDa protein was confirmed to be AS160 based on elevated PAS immunoreactivity in AS160 immunoprecipitates. Wortmannin inhibited insulin (120 nmol/l) and contraction effects on AS160 phosphorylation. Incubation with AICAR caused increased phosphorylation of AMP-activated protein kinase and AS160 but not Akt. Our working hypothesis is that phosphorylation of these putative Akt substrates is important for some of the insulin and contraction bioeffects.

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Crossref · 10.2337/diabetes.54.1.41

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  • AMPK rather than Akt is a possible candidate regulating TBC1D4 activity in response to exercise and muscle contractions.

    “AMPK rather than Akt has been proposed to be a possible candidate regulating TBC1D4 activity in response to exercise and muscle contractions given 1) Akt phosphorylation is not increased by exercise; 2) AICAR stimulates glucose uptake independently of insulin; 3) AICAR increases phosphorylation of TBC1D4 at PAS motifs in both rat [115] and mouse skeletal muscle [76]; and 4) glucose uptake is impa”

    From AMPK and Exercise: Glucose Uptake and Insulin Sensitivity (2013) · cites this paper as [115]

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Authors
Bruss, M. D., Arias, E. B., Lienhard, G. E., & Cartee, G. D.
Affiliations
  • University of Wisconsin–Madison (US)
  • University of Michigan (US)
  • Dartmouth College (US)
Venue
Diabetes
Published
2005-01-01
Volume
54
Issue
1
Pages
41-50
ISSN
  • 0012-1797 (ISSN-L)
  • 1939-327X
OpenAlex
W2148321229
Cited by
273
References
30
Citations by year
2025: 2 · 2023: 1 · 2022: 14 · 2021: 9 · 2020: 5 · 2019: 10 · 2018: 11 · 2017: 7 · 2016: 7 · 2015: 16 · 2014: 16 · 2013: 11 · 2012: 20
FWCI
9.97
Type
journal article
Language
en
Open access
closed
Locations
  • Diabetes (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health
  • National Institute on Aging (AG 10026)
  • National Institute of Diabetes and Digestive and Kidney Diseases (R01DK025336, DK-25336, R56DK042816)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › PI3K/AKT/mTOR signaling in cancer
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
Keywords
AS160, Akt phosphorylation, skeletal muscle, insulin signaling, muscle contraction, GLUT4 translocation, AMPK, wortmannin, epitrochlearis muscle
MeSH terms
Aminoimidazole Carboxamide, Animals, Insulin, Kinetics, Male, Muscle Contraction, Muscle Proteins, Phosphorylation, Proto-Oncogene Proteins, Ribonucleotides, Rats, Wistar, Protein Serine-Threonine Kinases, Muscle, Skeletal, Proto-Oncogene Proteins c-akt, Rats

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