Cited by 297Adipokines, Inflammation, and Metabolic DiseasesInflammasome and immune disordersAdipose Tissue and Metabolism

Obese adipocytes show ultrastructural features of stressed cells and die of pyroptosis

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Giordano, Antonio, Murano, Incoronata, Mondini, Eleonora, Perugini, Jessica, Smorlesi, Arianna, Severi, Ilenia, Barazzoni, Rocco, Scherer, Philipp E. +1 more·2013·Journal of Lipid Research

Abstract

We previously suggested that, in obese animals and humans, white adipose tissue inflammation results from the death of hypertrophic adipocytes; these are then cleared by macrophages, giving rise to distinctive structures we denominated crown-like structures. Here we present evidence that subcutaneous and visceral hypertrophic adipocytes of leptin-deficient (ob/ob and db/db) obese mice exhibit ultrastructural abnormalities (including calcium accumulation and cholesterol crystals), many of which are more common in hyperglycemic db/db versus normoglycemic ob/ob mice and in visceral versus subcutaneous depots. Degenerating adipocytes whose intracellular content disperses in the extracellular space were also noted in obese mice; in addition, increased anti-reactive oxygen species enzyme expression in obese fat pads, documented by RT-PCR and immunohistochemistry, suggests that ultrastructural changes are accompanied by oxidative stress. RT-PCR showed NLRP3 inflammasome activation in the fat pads of both leptin-deficient and high-fat diet obese mice, in which formation of active caspase-1 was documented by immunohistochemistry in the cytoplasm of several hypertrophic adipocytes. Notably, caspase-1 was not detected in FAT-ATTAC transgenic mice, where adipocytes die of apoptosis. Thus, white adipocyte overexpansion induces a stress state that ultimately leads to death. NLRP3-dependent caspase-1 activation in hypertrophic adipocytes likely induces obese adipocyte death by pyroptosis, a proinflammatory programmed cell death.

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Authors
Giordano, A., Murano, I., Mondini, E., Perugini, J., Smorlesi, A., Severi, I., Barazzoni, R., Scherer, P. E., & Cinti, S.
Affiliations
  • University of Trieste (IT)
  • The University of Texas Southwestern Medical Center (US)
  • Marche Polytechnic University (IT)
Corresponding author
Cinti, Saverio
Venue
Journal of Lipid Research
Publisher
Elsevier BV
Published
2013-09
Volume
54
Issue
9
Pages
2423-2436
ISSN
0022-2275 (ISSN-L)
OpenAlex
W1968144622
Cited by
297
References
52
Citations by year
2026: 17 · 2025: 18 · 2024: 25 · 2023: 32 · 2022: 38 · 2021: 27 · 2020: 31 · 2019: 18 · 2018: 20 · 2017: 20 · 2016: 12 · 2015: 19 · 2014: 15 · 2013: 4
FWCI
12.17
Type
journal article
Language
en
Open access
Locations
  • Journal of Lipid Research (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • ArTS Archivio della ricerca di Trieste (University of Trieste https://www.units.it/) (submittedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Università Politecnica delle Marche (Università Politecnica delle Marche) (submittedVersion)
Funders
European Commission (278373)
Topics
  • Health Sciences › Medicine › Epidemiology › Adipokines, Inflammation, and Metabolic Diseases
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Inflammasome and immune disorders
  • Health Sciences › Medicine › Physiology › Adipose Tissue and Metabolism
Keywords
obesity, pyroptosis, NLRP3 inflammasome, caspase-1, white adipose tissue inflammation, crown-like structures, leptin deficiency, db/db mice, ob/ob mice, oxidative stress, reactive oxygen species, calcium accumulation, cholesterol crystals, adipocyte ultrastructure, visceral adipose tissue, subcutaneous adipose tissue, programmed cell death
MeSH terms
NLR Family, Pyrin Domain-Containing 3 Protein, Animals, Carrier Proteins, Female, Obesity, Ultrasonography, Cell Death, Adipocytes, Oxidative Stress, Leptin, Subcutaneous Fat, Intra-Abdominal Fat, Mice, Receptors, Leptin, Inflammasomes, Diet, High-Fat

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