Cited by 213Metabolism, Diabetes, and CancerAdipose Tissue and MetabolismMuscle Physiology and Disorders

The DOI matches its Crossref record; 82 of the 82 references it cites were found in a registry or an index; none of the 12 sources its claims cite is checked for support yet.

Dynamic changes in fat oxidation in human primary myocytes mirror metabolic characteristics of the donor

Open access
Ukropcova, Barbara, McNeil, Michele, Sereda, Olga, de Jonge, Lilian, Xie, Hui, Bray, George A., Smith, Steven R.·2005·Journal of Clinical Investigation

Abstract

Metabolic flexibility of skeletal muscle, that is, the preference for fat oxidation (FOx) during fasting and for carbohydrate oxidation in response to insulin, is decreased during insulin resistance. The aim of this study was to test the hypothesis that the capacity of myotubes to oxidize fat in vitro reflects the donor's metabolic characteristics. Insulin sensitivity (IS) and metabolic flexibility of 16 healthy, young male subjects was determined by euglycemic hyperinsulinemic clamp. Muscle samples were obtained from vastus lateralis, cultured, and differentiated into myotubes. In human myotubes in vitro, we measured suppressibility (glucose suppression of FOx) and adaptability (an increase in FOx in the presence of high palmitate concentration). We termed these dynamic changes in FOx metabolic switching. In vivo, metabolic flexibility was positively correlated with IS and maximal oxygen uptake and inversely correlated with percent body fat. In vitro suppressibility was inversely correlated with IS and metabolic flexibility and positively correlated with body fat and fasting FFA levels. Adaptability was negatively associated with percent body fat and fasting insulin and positively correlated with IS and metabolic flexibility. The interindividual variability in metabolic phenotypes was preserved in human myotubes separated from their neuroendocrine environment, which supports the hypothesis that metabolic switching is an intrinsic property of skeletal muscle.

Overview

Integrity signals

Registry

Crossref · 10.1172/jci24332

Cites

82 of 82 references verified0 citation errors · 0 not checkable

Statistics

Nothing to recompute.

Verification

Claims the paper makes

0 of 12 cited sources checked · 0 supported · 0 flagged

Show all 57 claims

  • It may state two separate claims as one. 13
  • Probably not a substantial claim. 7
  • The quote only partly states this claim. 3
18 of 18
  • The paper relies on this without support.

    Growing human myotubes in a standardized insulin-free medium strips away whole-body neuroendocrine and environmental effects, so the in vitro readouts reveal intrinsic muscle-cell properties.

    “We cultured muscle satellite cells from individuals with differing clinical characteristics in a standardized, insulin-free medium”
    “This model is ideal for studying interindividual differences of metabolism intrinsic to the skeletal muscle, i.e., independent of the influences of the whole-body environment”
  • The paper relies on this without support.

    The donor's metabolic phenotype is stable and captured well enough by the measured in vivo traits.

    “We related these responses of myotubes in vitro to the clinical phenotypes of their donors.”
  • The paper relies on this without support.

    In vitro intrinsic defects in metabolic switching reflect processes that contribute to obesity and insulin resistance in vivo.

    “Intrinsic defects in metabolic switching of skeletal muscle might participate in the generation of a “lipotoxic milieu” in the muscle cell (13, 14) that acts in concert with environmental factors, such as a HFD, to favor the accumulation of lipids and lipid intermediates implicated in insulin resistance (34)(35)(36)(37).”
  • The paper relies on this without support.

    The in vitro suppressibility assay in insulin-free medium measures the same process as in vivo insulin responsiveness.

    “The in vitro suppressibility assay was designed to measure the ability of myotubes to maintain FOx in the presence of glucose, in insulin-free medium (that is, fuel preference of metabolic switching).”
  • The paper relies on this without support.

    The in vitro adaptability assay measures the capacity of myotubes to increase fat oxidation in a way that reflects in vivo adaptability.

    “The in vitro adaptability assay focused on the capacity of myotubes to increase FOx in response to an acute exposure to a high palmitate concentration.”
5 of 5

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?

Self-check

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

Each contradiction between two passages listed here was confirmed by an independent check.

  • Adaptability SD is incompatible with its mean and range

    Minor

    For 16 observations with a mean of 3.19 and a range of 2.99-4.87, the sample SD cannot exceed about 0.60. The reported SD of 0.76 is therefore incompatible with the other reported values.

  • Biopsy-method citation points to a different reference

    Minor

    The text cites reference 73 for the Bergstrom biopsy technique, but reference 73 is about energy expenditure. The Bergstrom biopsy paper is listed as reference 74.

2 of 2

Citations

Cites

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Show all 79 references

Research works printed but not linked: 12

  1. Raben, 1998, Am. J. Physiol., 275, E487
  2. Ranneries, 1998, Am. J. Physiol., 274, E155
  3. Zurlo, 1990, Am. J. Physiol., 259, E650
  4. Ravussin, 1993, Int. J. Obes. Relat. Metab. Disord., 17(Suppl. 3), S28
  5. Astrup, 1994, Am. J. Physiol., 266, E592
  6. Mandarino, 1996, Am. J. Physiol., 270, E463
  7. Sidossis, 1996, Am. J. Physiol., 270, E733
  8. Kleiber, 1992, Diabete. Metab., 18, 84
  9. Oakes, 2002, J. R. Soc. Med., 95(Suppl. 42), 33
  10. Kirkwood, 1991, Am. J. Physiol., 260, E89
  11. DeFronzo, 1979, Am. J. Physiol., 237, E214
  12. Acheson, 1984, Am. J. Physiol., 246, E62

Cited by

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Items 101–200 of 213

Metadata

Authors
Ukropcova, B., McNeil, M., Sereda, O., de Jonge, L., Xie, H., Bray, G. A., & Smith, S. R.
Affiliations
Pennington Biomedical Research Center (US)
Corresponding author
Smith, Steven R.
Venue
Journal of Clinical Investigation
Published
2005-07-01
Volume
115
Issue
7
Pages
1934-1941
ISSN
0021-9738 (ISSN-L)
OpenAlex
W2098384661
Cited by
213
References
79
Citations by year
2026: 2 · 2025: 7 · 2024: 4 · 2023: 4 · 2022: 3 · 2021: 5 · 2020: 10 · 2019: 4 · 2018: 7 · 2017: 9 · 2016: 10 · 2015: 11 · 2014: 12 · 2013: 21 · 2012: 11
FWCI
5.52
Type
journal article
Language
en
Open access
Locations
  • Journal of Clinical Investigation (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
U.S. Department of Agriculture
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
  • Health Sciences › Medicine › Physiology (medical) › Adipose Tissue and Metabolism
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
Keywords
fat oxidation, insulin sensitivity, myotubes, metabolic switch, insulin resistance, palmitate, fat mass, VO2max, interindividual variability, vastus lateralis
MeSH terms
Adolescent, Adult, Dietary Fats, Glucose, Humans, Insulin Resistance, Male, Models, Biological, Oxidation-Reduction, Phenotype, Glucose Clamp Technique, Muscle Fibers, Skeletal, Palmitic Acid, In Vitro Techniques

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