Cited by 1,039Inflammasome and immune disordersAtherosclerosis and Cardiovascular DiseasesCholesterol and Lipid Metabolism

Cholesterol Crystals Activate the NLRP3 Inflammasome in Human Macrophages: A Novel Link between Cholesterol Metabolism and Inflammation

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Rajamäki, Kristiina, Lappalainen, Jani, Öörni, Katariina, Välimäki, Elina, Matikainen, Sampsa, Kovanen, Petri T., Eklund, Kari K.·2010·PLoS ONE

Abstract

BACKGROUND: Chronic inflammation of the arterial wall is a key element in the pathogenesis of atherosclerosis, yet the factors that trigger and sustain the inflammation remain elusive. Inflammasomes are cytoplasmic caspase-1-activating protein complexes that promote maturation and secretion of the proinflammatory cytokines interleukin(IL)-1beta and IL-18. The most intensively studied inflammasome, NLRP3 inflammasome, is activated by diverse substances, including crystalline and particulate materials. As cholesterol crystals are abundant in atherosclerotic lesions, and IL-1beta has been linked to atherogenesis, we explored the possibility that cholesterol crystals promote inflammation by activating the inflammasome pathway. PRINCIPAL FINDINGS: Here we show that human macrophages avidly phagocytose cholesterol crystals and store the ingested cholesterol as cholesteryl esters. Importantly, cholesterol crystals induced dose-dependent secretion of mature IL-1beta from human monocytes and macrophages. The cholesterol crystal-induced secretion of IL-1beta was caspase-1-dependent, suggesting the involvement of an inflammasome-mediated pathway. Silencing of the NLRP3 receptor, the crucial component in NLRP3 inflammasome, completely abolished crystal-induced IL-1beta secretion, thus identifying NLRP3 inflammasome as the cholesterol crystal-responsive element in macrophages. The crystals were shown to induce leakage of the lysosomal protease cathepsin B into the cytoplasm and inhibition of this enzyme reduced cholesterol crystal-induced IL-1beta secretion, suggesting that NLRP3 inflammasome activation occurred via lysosomal destabilization. CONCLUSIONS: The cholesterol crystal-induced inflammasome activation in macrophages may represent an important link between cholesterol metabolism and inflammation in atherosclerotic lesions.

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Authors
Rajamäki, K., Lappalainen, J., Öörni, K., Välimäki, E., Matikainen, S., Kovanen, P. T., & Eklund, K. K.
Affiliations
  • Wihuri Research Institute (FI)
  • Finnish Institute of Occupational Health (FI)
Corresponding author
Rajamäki, Kristiina
Venue
PLoS ONE
Published
2010-07-23
Volume
5
Issue
7
Pages
e11765
ISSN
1932-6203 (ISSN-L)
OpenAlex
W2028545985
Cited by
1,039
References
60
Citations by year
2026: 65 · 2025: 51 · 2024: 45 · 2023: 77 · 2022: 80 · 2021: 74 · 2020: 72 · 2019: 57 · 2018: 66 · 2017: 77 · 2016: 52 · 2015: 76 · 2014: 75 · 2013: 70 · 2012: 59
FWCI
21.86
Type
journal article
Language
en
Open access
Locations
  • PLoS ONE (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
Funders
Jenny ja Antti Wihurin Rahasto
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Inflammasome and immune disorders
  • Life Sciences › Immunology and Microbiology › Immunology › Atherosclerosis and Cardiovascular Diseases
  • Health Sciences › Medicine › Surgery › Cholesterol and Lipid Metabolism
Keywords
cholesterol crystals, NLRP3 inflammasome, macrophages, atherosclerosis, IL-1β secretion, caspase-1, lysosomal destabilization, cathepsin B, cholesterol esters, cholesterol metabolism, inflammation, monocytes
MeSH terms
NLR Family, Pyrin Domain-Containing 3 Protein, Carrier Proteins, Cathepsin B, Cells, Cultured, Cholesterol, Chromatography, Thin Layer, Cytoplasm, Humans, Inflammation, Lipopolysaccharides, Lysosomes, Macrophages, Monocytes, Phagocytosis, Potassium, Blotting, Western, Cytochalasin D, Microscopy, Confocal, Reverse Transcriptase Polymerase Chain Reaction, Caspase 1, RNA, Small Interfering, Interleukin-1beta, Caspase Inhibitors

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