Cited by 4,664Adipokines, Inflammation, and Metabolic DiseasesImmune cells in cancerAdipose Tissue and Metabolism

Obesity induces a phenotypic switch in adipose tissue macrophage polarization

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Lumeng, Carey N., Bodzin, Jennifer L., Saltiel, Alan R.·2007·Journal of Clinical Investigation

Abstract

Adipose tissue macrophages (ATMs) infiltrate adipose tissue during obesity and contribute to insulin resistance. We hypothesized that macrophages migrating to adipose tissue upon high-fat feeding may differ from those that reside there under normal diet conditions. To this end, we found a novel F4/80(+)CD11c(+) population of ATMs in adipose tissue of obese mice that was not seen in lean mice. ATMs from lean mice expressed many genes characteristic of M2 or "alternatively activated" macrophages, including Ym1, arginase 1, and Il10. Diet-induced obesity decreased expression of these genes in ATMs while increasing expression of genes such as those encoding TNF-alpha and iNOS that are characteristic of M1 or "classically activated" macrophages. Interestingly, ATMs from obese C-C motif chemokine receptor 2-KO (Ccr2-KO) mice express M2 markers at levels similar to those from lean mice. The antiinflammatory cytokine IL-10, which was overexpressed in ATMs from lean mice, protected adipocytes from TNF-alpha-induced insulin resistance. Thus, diet-induced obesity leads to a shift in the activation state of ATMs from an M2-polarized state in lean animals that may protect adipocytes from inflammation to an M1 proinflammatory state that contributes to insulin resistance.

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  • Obese ATMs produce high levels of TNFα, IL-6, and IL-1β, also elevated in insulin resistant individuals.

    “These cells produce high levels of TNFα, IL-6, and IL-1β, all of which are also observed in increased levels of adipose tissue from insulin resistant individuals.”
  • In obesity, ATMs have a strongly polarized pro-inflammatory M1 phenotype.

    “While the ATMs present in healthy lean adipose tissue are primarily of an M2 phenotype, those that accumulate in the adipose tissue during obesity have a strongly polarized pro-inflammatory, M1 phenotype [63,69–71].”
  • Two studies that investigated cellular markers of inflammation both reported an anti-inflammatory effect of vitamin D.

    “However, two studies that investigated cellular markers of inflammation both reported an anti-inflammatory effect of vitamin D (747,748) .”
  • Devaraj et al. found significant inverse relationships between serum 25(OH)D3 and CRP concentration, monocyte NF-κB activation and TLR4 expression in pooled healthy subjects, type 1 diabetics and type 1 diabetics with microvascular complications.

    “Using data pooled from thirty-six healthy subjects, twenty-four type 1 diabetics and twenty-six type 1 diabetics with microvascular complications, Devaraj et al. (747) found significant inverse relationships between serum 25(OH)D 3 and CRP concentration, monocyte NF-kB activation and TLR4 expression.”
  • These proinflammatory macrophages are implicated in the development of insulin resistance.

    “Accordingly, because of their proinflammatory properties, these macrophages are implicated in the pathogenesis of insulin resistance (103, 105, 112, 113).”

    From Insulin sensitivity: Modulation by nutrients and inflammation (2008) · cites this paper as [103]

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Authors
Lumeng, C. N., Bodzin, J. L., & Saltiel, A. R.
Affiliations
University of Michigan (US)
Corresponding author
Saltiel, Alan R.
Venue
Journal of Clinical Investigation
Published
2007-01-02
Volume
117
Issue
1
Pages
175-184
ISSN
0021-9738 (ISSN-L)
OpenAlex
W2145697808
Cited by
4,664
References
54
Citations by year
2026: 157 · 2025: 214 · 2024: 227 · 2023: 224 · 2022: 256 · 2021: 324 · 2020: 320 · 2019: 304 · 2018: 290 · 2017: 322 · 2016: 296 · 2015: 290 · 2014: 286 · 2013: 319 · 2012: 226
FWCI
92.09
Type
journal article
Language
en
Open access
Locations
  • Journal of Clinical Investigation (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • University of Michigan
  • National Institutes of Health (HD028820)
  • National Institute of Diabetes and Digestive and Kidney Diseases (R01DK60591, R01DK060591)
  • Eunice Kennedy Shriver National Institute of Child Health and Human Development (T32HD007513, K12HD028820)
Topics
  • Health Sciences › Medicine › Epidemiology › Adipokines, Inflammation, and Metabolic Diseases
  • Life Sciences › Immunology and Microbiology › Immunology › Immune cells in cancer
  • Health Sciences › Medicine › Physiology › Adipose Tissue and Metabolism
Keywords
obesity, adipose tissue macrophages, macrophage polarization, M1/M2 macrophages, insulin resistance, diet-induced obesity, CCR2, IL-10, TNF-α, adipocyte inflammation, high-fat diet, M2 macrophages
MeSH terms
Adipose Tissue, Animals, Base Sequence, Biological Transport, Energy Intake, Deoxyglucose, Dietary Fats, Disease Models, Animal, Macrophages, Male, Mice, Inbred C57BL, Mice, Obese, Obesity, 3T3 Cells, DNA Primers, Reverse Transcriptase Polymerase Chain Reaction, Mice

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