Cited by 152Adipokines, Inflammation, and Metabolic DiseasesAdipose Tissue and MetabolismDiabetes, Cardiovascular Risks, and Lipoproteins

Associations between insulin resistance and TNF-α in plasma, skeletal muscle and adipose tissue in humans with and without type 2 diabetes

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Plomgaard, P., Nielsen, A. R., Fischer, C. P., Mortensen, O. H., Broholm, C., Penkowa, M., Krogh-Madsen, R., Erikstrup, C. +4 more·2007·Diabetologia

Abstract

Aims/hypothesis Clear evidence exists that TNF-alpha inhibits insulin signalling and thereby glucose uptake in myocytes and adipocytes. However, conflicting results exist with regard to the role of TNF-alpha in type 2 diabetes.Methods We obtained blood and biopsy samples from skeletal muscle and subcutaneous adipose tissue in patients with type 2 diabetes (n = 96) and healthy controls matched for age, sex and BMI (n = 103).Results Patients with type 2 diabetes had higher plasma levels of fasting insulin (p < 0.0001) and glucose (p < 0.0001) compared with controls, but there was no difference between groups with regard to fat mass. Plasma levels of TNF-alpha (p = 0.0009) and soluble TNF receptor 2 (sTNFR2; p = 0.002) were elevated in diabetic patients. Insulin sensitivity was correlated with quartiles of plasma TNF-alpha after adjustment for age, sex, obesity, WHR, neutrophils, IL-6 and maximum O(2) uptake (VO2/kg) in the diabetes group (p < 0.05). The TNF mRNA content of adipose or muscle tissue did not differ between the groups, whereas muscle TNF-alpha protein content, evaluated by western blotting, was higher in type 2 diabetic patients. Immunohistochemistry revealed more TNF-alpha protein in type 2 than in type 1 muscle fibres.Conclusions/interpretation After adjustment for multiple confounders, plasma TNF-alpha is associated with insulin resistance. This supports the idea that TNF-alpha plays a significant role in the pathogenesis of chronic insulin resistance in humans. However, findings on the TNF-alpha protein levels in plasma and skeletal muscle indicate that measurement of TNF mRNA content in adipose or muscle tissue provides no information with regard to the degree of insulin resistance.

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  • After adjustment for multiple confounders including IL-6, high plasma TNF concentrations are associated with insulin resistance.

    “After adjustment for multiple confounders, including IL-6, high plasma TNF concentrations are associated with insulin resistance [40].”
  • Elevated TNF-α is not secondary to the pathological conditions associated with insulin resistance, but plays a direct pathogenic role in glucose metabolism.

    “Thus, a number of studies indicate that elevated TNF-α is not secondary to the pathological conditions associated with insulin resistance, but that TNF-α plays a direct pathogenic role in glucose metabolism [29, 40].”
  • Both TNF-α and IL-6 induce lipolysis, but only IL-6 appears to induce fat oxidation.

    “Of note, whereas it is known that both TNF-α and IL-6 induce lipolysis [40, 49], only IL-6 appears to induce fat oxidation [19, 59].”

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Authors
Plomgaard, P., Nielsen, A. R., Fischer, C. P., Mortensen, O. H., Broholm, C., Penkowa, M., Krogh-Madsen, R., Erikstrup, C., Lindegaard, B., Petersen, A. M. W., Taudorf, S., & Pedersen, B. K.
Affiliations
University of Copenhagen (DK)
Corresponding author
Plomgaard, P.
Venue
Diabetologia
Published
2007-10-10
Volume
50
Issue
12
Pages
2562-2571
ISSN
  • 0012-186X (ISSN-L)
  • 1432-0428
OpenAlex
W1989605721
Cited by
152
References
41
Citations by year
2026: 3 · 2025: 3 · 2024: 4 · 2023: 11 · 2022: 7 · 2021: 3 · 2020: 5 · 2019: 8 · 2018: 9 · 2017: 5 · 2016: 7 · 2015: 11 · 2014: 10 · 2013: 12 · 2012: 12
FWCI
8.02
Type
journal article
Language
en
Open access
Locations
  • Diabetologia (publishedVersion)
  • PubMed (publishedVersion)
  • Research at the University of Copenhagen (University of Copenhagen) (submittedVersion)
  • Scopus (Elsevier) (submittedVersion)
Funders
  • Sundhed og Sygdom, Det Frie Forskningsråd (LSHM-CT-2004-005272 EXGENESIS, LSHM-CT-2004-005272)
  • National Research Foundation
  • Danmarks Grundforskningsfond (02-512-555, DG 02–512‐555, LSHM-CT-2004-005272, LSHM-CT-2004-005272 EXGENESIS)
  • Novo Nordisk
  • Novo Nordisk Fonden
  • Diabetesforeningen
  • Medical Research Council
Topics
  • Health Sciences › Medicine › Epidemiology › Adipokines, Inflammation, and Metabolic Diseases
  • Health Sciences › Medicine › Physiology › Adipose Tissue and Metabolism
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes, Cardiovascular Risks, and Lipoproteins
Keywords
type 2 diabetes, insulin resistance, TNF-α, soluble TNF receptor 2, skeletal muscle, subcutaneous adipose tissue, insulin sensitivity, TNF-alpha mRNA, muscle fiber type, insulin signaling, glucose uptake
MeSH terms
Adipose Tissue, Body Composition, C-Reactive Protein, Cross-Sectional Studies, Diabetes Mellitus, Type 2, Female, Humans, Insulin Resistance, Leukocyte Count, Male, Middle Aged, Neutrophils, Tumor Necrosis Factor-alpha, Interleukin-6, Case-Control Studies, Muscle, Skeletal, Receptors, Tumor Necrosis Factor, Type II

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