Cited by 76Inflammasome and immune disordersAtherosclerosis and Cardiovascular DiseasesCholesterol and Lipid Metabolism

p38δ MAPK: A Novel Regulator of NLRP3 Inflammasome Activation With Increased Expression in Coronary Atherogenesis

Rajamäki, Kristiina, Mäyränpää, Mikko I., Risco, Ana, Tuimala, Jarno, Nurmi, Katariina, Cuenda, Ana, Eklund, Kari K., Öörni, Katariina +1 more·2016·Arteriosclerosis, Thrombosis, and Vascular Biology

Abstract

Objective—: Activation of the inflammasome pathway in macrophages results in the secretion of 2 potent proinflammatory and proatherogenic cytokines, interleukin (IL)-1β, and IL-18. Atherosclerotic lesions are characterized by the presence of various endogenous activators of the NLR family pyrin domain containing 3 (NLRP3) inflammasome, including cholesterol crystals and extracellular ATP. The aim of this study was to comprehensively characterize the expression of inflammasome pathway components and regulators in human atherosclerotic lesions. Approach and Results—: Twenty human coronary artery RNA samples from 10 explanted hearts were analyzed using an inflammasome pathway–focused quantitative polymerase chain reaction array. Advanced atherosclerotic plaques, when compared with early-to-intermediate lesions from the same coronary trees, displayed significant upregulation of 12 target genes, including the key inflammasome components apoptosis-associated speck-like protein containing a CARD domain, caspase-1, and IL-18. Immunohistochemical stainings of the advanced plaques revealed macrophage foam cells positive for NLRP3 inflammasome components around the necrotic lipid cores. The polymerase chain reaction array target p38δ mitogen-activated protein kinase was upregulated in advanced plaques and strongly expressed by lesional macrophage foam cells. In cultured human monocyte–derived macrophages, the p38δ mitogen-activated protein kinase was activated by intracellular stress signals triggered during ATP- and cholesterol crystal–induced NLRP3 inflammasome activation and was required for NLRP3-mediated IL-1β secretion. Conclusions—: Increased expression of the key inflammasome components in advanced coronary lesions implies enhanced activity of the inflammasome pathway in progression of coronary atherosclerosis. The p38δ mitogen-activated protein kinase was identified as a novel regulator of NLRP3 inflammasome activation in primary human macrophages, and thus, represents a potential target for modulation of atherosclerotic inflammation.

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Crossref · 10.1161/atvbaha.115.307312

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  • Human atherosclerotic lesions show increased expression of major NLRP3 components, and inhibition of the NLRP3 inflammasome reduces atherosclerosis in Apoe−/− mice.

    “Human atherosclerotic lesions show increased expression of the major components of NLRP3 (REF 61), and inhibition of the NLRP3 inflammasome reduces atherosclerosis in Apoe−/− mice62.”

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Authors
Rajamäki, K., Mäyränpää, M. I., Risco, A., Tuimala, J., Nurmi, K., Cuenda, A., Eklund, K. K., Öörni, K., & Kovanen, P. T.
Affiliations
University of Helsinki (FI)
Venue
Arteriosclerosis, Thrombosis, and Vascular Biology
Published
2016-09
Volume
36
Issue
9
Pages
1937-1946
ISSN
  • 1079-5642 (ISSN-L)
  • 1524-4636
OpenAlex
W2474072601
Cited by
75
References
40
Citations by year
2026: 3 · 2025: 14 · 2024: 10 · 2023: 9 · 2022: 6 · 2021: 6 · 2020: 9 · 2019: 5 · 2018: 3 · 2017: 8 · 2016: 2
FWCI
3.12
Type
journal article
Language
en
Open access
closed
Locations
  • Arteriosclerosis Thrombosis and Vascular Biology (publishedVersion)
  • PubMed (publishedVersion)
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
NLRP3 inflammasome, coronary artery disease, foam cells, IL-1β secretion, caspase-1, IL-18, cholesterol crystals, extracellular ATP, atherosclerotic plaque progression, atherosclerotic inflammation
MeSH terms
NLR Family, Pyrin Domain-Containing 3 Protein, Adenosine Triphosphate, Histocompatibility Antigens Class II, Cells, Cultured, Cholesterol, Coronary Artery Disease, Coronary Vessels, Crystallization, Enzyme Activation, Foam Cells, Humans, Male, Middle Aged, Necrosis, Nuclear Proteins, Time Factors, Signal Transduction, Trans-Activators, Up-Regulation, Oligonucleotide Array Sequence Analysis, Gene Expression Profiling, Mitogen-Activated Protein Kinase 13, Plaque, Atherosclerotic, Inflammasomes, Real-Time Polymerase Chain Reaction, Primary Cell Culture

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