Cited by 415Fibroblast Growth Factor ResearchMuscle Physiology and DisordersMetabolism, Diabetes, and Cancer

FGF21 is an Akt‐regulated myokine

Open access
Izumiya, Yasuhiro, Bina, Holly A., Ouchi, Noriyuki, Akasaki, Yuichi, Kharitonenkov, Alexei, Walsh, Kenneth·2008·FEBS Letters

Abstract

Fibroblast growth factor‐21 (FGF21) functions as a metabolic regulator. The FGF21 transcript is reported to be abundantly expressed in liver, but little is known about the regulation of FGF21 expression in other tissues. In this study, we show that levels of FGF21 protein expression were similar in skeletal muscle and liver from fasted mice. FGF21 transcript and protein expression were upregulated in gastrocnemius muscle of skeletal muscle‐specific Akt1 transgenic mice. Serum concentration of FGF21 was also increased by Akt1 transgene activation. In cultured skeletal muscle cells, FGF21 expression and secretion was regulated by insulin, Akt transduction and LY294002. These data indicate that skeletal muscle is a source of FGF21 and that its expression is regulated by a phosphatidylinosistol 3‐kinase (PI3‐kinase)/Akt1 signaling pathway‐dependent mechanism.

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1016/j.febslet.2008.10.021

Cites

31 of 31 references verified0 citation errors · 0 not checkable

Statistics

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • FGF-21 is regulated by insulin through PI3K/Akt1 signaling pathway.

    “Fibroblast growth factor-21 is regulated by insulin285 through the PI3K/Akt1 signaling pathway.286”

    From Pancreatic regulation of glucose homeostasis. (2016) · cites this paper as [286]

  • In healthy skeletal muscle, FGF21 expression is almost undetectable.

    “In skeletal muscle, FGF21 expression, in healthy conditions, is almost undetectable, and therefore, the circulating FGF21 is predominantly produced and released by the liver.6, 12”
  • Starvation is one of the stress conditions known to induce FGF21 expression in the liver, white adipose tissue, and skeletal muscle.

    “Starvation is one of the stress conditions known to induce FGF21 expression in the liver,8, 32 WAT,10 and skeletal muscle (Figure 2A).6”
  • Skeletal muscle is not only a producer but also a target of FGF21 because it expresses the cofactor β-klotho and the FGFRs.

    “Recent studies reported that skeletal muscle is not only a producer but also a target of FGF21 because it expresses the cofactor β‐klotho and the FGFRs.6, 13, 14, 17, 18, 19”
  • Muscle-dependent systemic release of FGF21 increases with starvation, endoplasmic reticulum stress, mitochondrial dysfunction, obesity, mitochondrial myopathies, and aging.

    “In contrast, muscle‐dependent systemic release of FGF21 increases with starvation, endoplasmic reticulum stress, mitochondrial dysfunction, obesity, mitochondrial myopathies, and aging.6, 13, 14, 15, 16, 17, 18, 19”

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Cites

Flagged first, then by citations

Cited by

Sorted by citations

Authors
Izumiya, Y., Bina, H. A., Ouchi, N., Akasaki, Y., Kharitonenkov, A., & Walsh, K.
Affiliations
  • Boston University (US)
  • Eli Lilly (United States) (US)
Corresponding author
Walsh, Kenneth
Venue
FEBS Letters
Publisher
Wiley
Published
2008-10-21
Volume
582
Issue
27
Pages
3805-3810
ISSN
  • 0014-5793 (ISSN-L)
  • 1873-3468
OpenAlex
W2047726905
Cited by
415
References
31
Citations by year
2026: 7 · 2025: 23 · 2024: 25 · 2023: 25 · 2022: 21 · 2021: 18 · 2020: 20 · 2019: 35 · 2018: 31 · 2017: 26 · 2016: 21 · 2015: 36 · 2014: 33 · 2013: 23 · 2012: 24
FWCI
6.44
Type
journal article
Language
en
Open access
Locations
  • FEBS Letters (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institute on Aging (R01AG015052, R37AG015052, AG15052)
  • National Heart, Lung, and Blood Institute (HL81587, HL77774, R01HL086785, P01HL081587, HL 86785, R01HL077774)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Fibroblast Growth Factor Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
Keywords
FGF21, myokines, AKT1, skeletal muscle, PI3K/Akt signaling, insulin, gastrocnemius, metabolic regulation, fasting
MeSH terms
Phosphoinositide-3 Kinase Inhibitors, Animals, Cell Line, Chromones, Fibroblast Growth Factors, Insulin, Liver, Mice, Transgenic, Morpholines, Signal Transduction, Up-Regulation, Muscle, Skeletal, Phosphatidylinositol 3-Kinases, Protein Kinase Inhibitors, Proto-Oncogene Proteins c-akt, Mice

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review