Cited by 1,143Peroxisome Proliferator-Activated ReceptorsAdipokines, Inflammation, and Metabolic DiseasesAdipose Tissue and Metabolism

PPAR-γ is a major driver of the accumulation and phenotype of adipose tissue Treg cells

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Cipolletta, Daniela, Feuerer, Markus, Li, Amy, Kamei, Nozomu, Lee, Jongsoon, Shoelson, Steven E., Benoist, Christophe, Mathis, Diane·2012·Nature

Abstract

Obesity and type-2 diabetes have increased markedly over the past few decades, in parallel. One of the major links between these two disorders is chronic, low-grade inflammation. Prolonged nutrient excess promotes the accumulation and activation of leukocytes in visceral adipose tissue (VAT) and ultimately other tissues, leading to metabolic abnormalities such as insulin resistance, type-2 diabetes and fatty-liver disease. Although invasion of VAT by pro-inflammatory macrophages is considered to be a key event driving adipose-tissue inflammation and insulin resistance, little is known about the roles of other immune system cell types in these processes. A unique population of VAT-resident regulatory T (Treg) cells was recently implicated in control of the inflammatory state of adipose tissue and, thereby, insulin sensitivity. Here we identify peroxisome proliferator-activated receptor (PPAR)-γ, the 'master regulator' of adipocyte differentiation, as a crucial molecular orchestrator of VAT Treg cell accumulation, phenotype and function. Unexpectedly, PPAR-γ expression by VAT Treg cells was necessary for complete restoration of insulin sensitivity in obese mice by the thiazolidinedione drug pioglitazone. These findings suggest a previously unknown cellular mechanism for this important class of thiazolidinedione drugs, and provide proof-of-principle that discrete populations of Treg cells with unique functions can be precisely targeted to therapeutic ends.

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  • Treg cells support tissue homeostasis and regeneration, ranging from regulating metabolic parameters in adipose tissue to potentiating tissue repair in skeletal muscles, lung tissue, or brain.

    “They have been shown to support tissue homeostasis and regeneration, ranging from regulating metabolic parameters in the adipose tissue to potentiating tissue repair [444-446], e.g., in skeletal muscles [447], lung tissue [448], or brain [449].”
  • PPARγ is known to regulate VAT Treg cell development.

    “Transcription factors whose activity were increased in both liver and V AT Treg cells compared to spleen Treg cells included PPAR γ (known to regulate VAT Treg cell development 40 ), AHR, AR, HIF1 α , and ROR γ t, while transcription factors with increased activity in liver Treg cells but not VAT Treg cells compared to spleen Treg cells included HOXB4, IRF4, IRF8, and STAT5 (Fig. 2G).”
  • The numerical increase in hepatic Tregs in mice with MASH, also observed by single-cell RNA-sequencing in MASH patients, is consistent with recent reports of Treg enrichment in this setting.

    “The numerical increase in hepatic Tregs in mice with MASH, also observed via scRNA-seq in MASH patients, is consistent with recent reports of Treg enrichment in such a setting (26).”

    From Regulatory T cells safeguard liver health during metabolic-associated steatohepatitis (2026) · cites this paper as [26]

    The passage on pioglitazone-treated, high-fat-diet-fed mice (section labeled Abstract; page unavailable) reports Treg enrichment in visceral fat, not liver. Our copy does not address hepatic Treg enrichment in MASH mice or scRNA-seq findings in MASH patients; searches for MASH, NASH, and liver Tregs found no passage establishing either point. (LLM, conf=0.75)

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Authors
Cipolletta, D., Feuerer, M., Li, A., Kamei, N., Lee, J., Shoelson, S. E., Benoist, C., & Mathis, D.
Affiliations
  • Harvard University (US)
  • Joslin Diabetes Center (US)
Corresponding author
Mathis, Diane
Venue
Nature
Published
2012-05-16
Volume
486
Issue
7404
Pages
549-553
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
OpenAlex
W2041544510
Cited by
1,143
References
23
Citations by year
2026: 47 · 2025: 85 · 2024: 74 · 2023: 56 · 2022: 90 · 2021: 104 · 2020: 99 · 2019: 93 · 2018: 96 · 2017: 92 · 2016: 78 · 2015: 80 · 2014: 65 · 2013: 76 · 2012: 7
FWCI
29.29
Type
journal article
Language
en
Open access
Locations
  • Nature (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • Digital Access to Scholarship at Harvard (DASH) (Harvard University) (submittedVersion, cc-by)
  • RePEc: Research Papers in Economics (submittedVersion)
Funders
  • National Institute of General Medical Sciences (T32GM007753)
  • National Institute of Diabetes and Digestive and Kidney Diseases (DK 51729, DK092541, R01DK051729, P30-DK36836, R37DK051729, P30DK036836, R01DK092541)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Peroxisome Proliferator-Activated Receptors
  • Health Sciences › Medicine › Epidemiology › Adipokines, Inflammation, and Metabolic Diseases
  • Health Sciences › Medicine › Physiology › Adipose Tissue and Metabolism
Keywords
PPARγ, regulatory T cells, visceral adipose tissue, thiazolidinediones, pioglitazone, insulin sensitivity, obesity, type 2 diabetes, adipose tissue inflammation, insulin resistance
MeSH terms
Pioglitazone, Adipose Tissue, Animals, Cell Differentiation, Diabetes Mellitus, Type 2, Epididymis, Hypoglycemic Agents, Inflammation, Insulin Resistance, Male, Mice, Inbred C57BL, Mice, Obese, Obesity, Phenotype, RNA, Messenger, Transcription, Genetic, Gene Expression, Lymphocyte Count, Thiazolidinediones, PPAR gamma, T-Lymphocytes, Regulatory, Mice, Forkhead Transcription Factors

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