Cited by 200Muscle Physiology and DisordersMuscle metabolism and nutritionMetabolism, Diabetes, and Cancer

Protein kinase B/Akt: a nexus of growth factor and cytokine signaling in determining muscle mass

Frost, Robert A., Lang, Charles H.·2007·Journal of Applied Physiology

Abstract

Although the boundaries of skeletal muscle size are fundamentally determined by genetics, this dynamic tissue also demonstrates great plasticity in response to environmental and hormonal factors. Recent work indicates that contractile activity, nutrients, growth factors, and cytokines all contribute to determining muscle mass. Muscle responds not only to endocrine hormones but also to the autocrine production of growth factors and cytokines. Skeletal muscle synthesizes anabolic growth factors such as insulin-like growth factor (IGF)-I and potentially inhibitory cytokines such as interleukin (IL)-6, tumor necrosis factor (TNF)-α, and myostatin. These self-regulating inputs in turn influence muscle metabolism, including the use of nutrients such as glucose and amino acids. These changes are principally achieved by altering the activity of the protein kinase known as protein kinase B or Akt. Akt plays a central role in integrating anabolic and catabolic responses by transducing growth factor and cytokine signals via changes in the phosphorylation of its numerous substrates. Activation of Akt stimulates muscle hypertrophy and antagonizes the loss of muscle protein. Here we review the many signals that funnel through Akt to alter muscle mass.

Integrity signals

Registry

Crossref · 10.1152/japplphysiol.00089.2007

Cites

122 of 122 references verified0 citation errors · 0 not checkable

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  • Akt is a serine/threonine kinase that signals downstream of growth factor receptors and PI3K; growth factor receptors, nutrients, and muscle contraction increase Akt activity.

    “Akt is a serine/threonine kinase that signals downstream of growth factor receptors and phosphoinositide-3 kinase (PI3K); therefore, growth factor receptors, nutrients, and even muscle contraction increase Akt activity (13).”

    From Anabolic effect of plant brassinosteroid (2011) · cites this paper as [13]

  • Akt is a serine/threonine kinase that signals downstream of growth factor receptors and phosphoinositide-3 kinase PI3K.

    “Akt is a serine/threonine kinase that signals downstream of growth factor receptors and phosphoinositide-3 kinase PI3K.”

    From Anabolic effect of plant brassinosteroid (2011) · cites this paper as [13]

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Authors
Frost, R. A., & Lang, C. H.
Affiliations
Pennsylvania State University (US)
Venue
Journal of Applied Physiology
Published
2007-07
Volume
103
Issue
1
Pages
378-387
ISSN
  • 0161-7567 (ISSN-L)
  • 8750-7587
  • 1522-1601
OpenAlex
W2105981385
Cited by
200
References
122
Citations by year
2026: 6 · 2025: 2 · 2024: 7 · 2023: 5 · 2022: 10 · 2021: 8 · 2020: 5 · 2019: 9 · 2018: 5 · 2017: 4 · 2016: 15 · 2015: 8 · 2014: 10 · 2013: 14 · 2012: 11
FWCI
8.79
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Applied Physiology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institute on Alcohol Abuse and Alcoholism (AA 11290, R01AA011290)
  • National Institute of General Medical Sciences (GM 38032)
  • National Institute of Diabetes and Digestive and Kidney Diseases (DK-72909, R01DK072909)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Muscle metabolism and nutrition
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
Keywords
Akt/protein kinase B, skeletal muscle mass, muscle hypertrophy, muscle atrophy, growth factor signaling, cytokine signaling, insulin-like growth factor I, interleukin-6, TNF-α, myostatin, autocrine signaling, muscle metabolism, nutrient utilization, muscle protein synthesis, muscle protein degradation, contractile activity
MeSH terms
Adenosine Triphosphate, Animals, Humans, Hypertrophy, Insulin-Like Growth Factor I, Muscle Contraction, Muscular Atrophy, Signal Transduction, Cytokines, Transforming Growth Factor beta, NF-kappa B, Muscle, Skeletal, Phosphatidylinositol 3-Kinases, Autocrine Communication, Paracrine Communication, Intercellular Signaling Peptides and Proteins, Cell Size, Cell Proliferation, Proto-Oncogene Proteins c-akt, Myostatin

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