Cited by 1,305Adipokines, Inflammation, and Metabolic DiseasesAdipose Tissue and MetabolismCardiovascular Disease and Adiposity

The expression of tumor necrosis factor in human adipose tissue. Regulation by obesity, weight loss, and relationship to lipoprotein lipase

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Kern, P A, Saghizadeh, M, Ong, J M, Bosch, R J, Deem, R, Simsolo, R B·1995·Journal of Clinical Investigation

Abstract

A previous study reported the increased expression of the cytokine TNF in the adipose tissue of genetically obese rodents. To examine this paradigm in humans, we studied TNF expression in lean, obese, and reduced-obese human subjects. TNF mRNA was demonstrated in human adipocytes and adipose tissue by Northern blotting and PCR. TNF protein was quantitated by Western blotting and ELISA in both adipose tissue and the medium surrounding adipose tissue. Using quantitative reverse transcriptase PCR (RT-PCR), TNF mRNA levels were examined in the adipose tissue of 39 nondiabetic subjects, spanning a broad range of body mass index (BMI). There was a significant increase in adipose TNF mRNA levels with increasing adiposity. There was a significant correlation between TNF mRNA and percent body fat (r = 0.46, P < 0.05, n = 23). TNF mRNA tended to decrease in very obese subjects, but when subjects with a BMI > 45 kg/m2 were excluded, there was a significant correlation between TNF mRNA and BMI (r = 0.37, P < 0.05, n = 32). In addition, there was a significant decrease in adipose TNF with weight loss. In 11 obese subjects who lost between 14 and 66 kg (mean 34.7 kg, or 26.6% of initial weight), TNF mRNA levels decreased to 58% of initial levels after weight loss (P < 0.005), and TNF protein decreased to 46% of initial levels (P < 0.02). TNF is known to inhibit LPL activity. When fasting adipose LPL activity was measured in these subjects, there was a significant inverse relationship between TNF expression and LPL activity (r = -0.39, P < 0.02, n = 39). With weight loss, LPL activity increased to 411% of initial levels. However, the magnitude of the increase in LPL did not correlate with the decrease in TNF. Thus, TNF is expressed in human adipocytes. TNF is elevated in most obese subjects and is decreased by weight loss. In addition, there is an inverse relationship between TNF and LPL expression. These data suggest that endogenous TNF expression in adipose tissue may help limit obesity in some subjects, perhaps by increasing insulin resistance and decreasing LPL.

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Authors
Kern, P. A., Saghizadeh, M., Ong, J. M., Bosch, R. J., Deem, R., & Simsolo, R. B.
Affiliations
Cedars-Sinai Medical Center (US)
Venue
Journal of Clinical Investigation
Published
1995-05-01
Volume
95
Issue
5
Pages
2111-2119
ISSN
0021-9738 (ISSN-L)
OpenAlex
W2066160102
Cited by
1,305
References
62
Citations by year
2026: 13 · 2025: 12 · 2024: 18 · 2023: 26 · 2022: 29 · 2021: 26 · 2020: 33 · 2019: 24 · 2018: 39 · 2017: 40 · 2016: 26 · 2015: 46 · 2014: 55 · 2013: 49 · 2012: 51
FWCI
28.34
Type
journal article
Language
en
Open access
Locations
  • Journal of Clinical Investigation (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • American Heart Association
  • Deutsches Krebsforschungszentrum
  • Cedars-Sinai Medical Center
  • National Institutes of Health
  • National Institute of Diabetes and Digestive and Kidney Diseases (DK 39176)
  • National Center for Research Resources (RR00425, M01RR000425)
Topics
  • Health Sciences › Medicine › Epidemiology › Adipokines, Inflammation, and Metabolic Diseases
  • Health Sciences › Medicine › Physiology › Adipose Tissue and Metabolism
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiovascular Disease and Adiposity
Keywords
TNF-α, adipose tissue, obesity, weight loss, lipoprotein lipase, adipocytes, body mass index, TNF mRNA expression, insulin resistance, adipose tissue inflammation, adipose tissue cytokines
MeSH terms
Adipose Tissue, Adult, Biopsy, Cells, Cultured, Enzyme-Linked Immunosorbent Assay, Female, Gene Expression Regulation, Humans, Lipoprotein Lipase, Male, Middle Aged, Obesity, Regression Analysis, RNA, Messenger, Tumor Necrosis Factor-alpha, Blotting, Northern, Weight Loss, Body Mass Index, Polymerase Chain Reaction, Adipocytes

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