Cited by 355Inflammasome and immune disordersImmune Response and Inflammationinterferon and immune responses

Oxysterol Restraint of Cholesterol Synthesis Prevents AIM2 Inflammasome Activation

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Dang, Eric V., McDonald, Jeffrey G., Russell, David W., Cyster, Jason G.·2017·Cell

Abstract

Type I interferon restrains interleukin-1β (IL-1β)-driven inflammation in macrophages by upregulating cholesterol-25-hydroxylase (Ch25h) and repressing SREBP transcription factors. However, the molecular links between lipid metabolism and IL-1β production remain obscure. Here, we demonstrate that production of 25-hydroxycholesterol (25-HC) by macrophages is required to prevent inflammasome activation by the DNA sensor protein absent in melanoma 2 (AIM2). We find that in response to bacterial infection or lipopolysaccharide (LPS) stimulation, macrophages upregulate Ch25h to maintain repression of SREBP2 activation and cholesterol synthesis. Increasing macrophage cholesterol content is sufficient to trigger IL-1β release in a crystal-independent but AIM2-dependent manner. Ch25h deficiency results in cholesterol-dependent reduced mitochondrial respiratory capacity and release of mitochondrial DNA into the cytosol. AIM2 deficiency rescues the increased inflammasome activity observed in Ch25h-/-. Therefore, activated macrophages utilize 25-HC in an anti-inflammatory circuit that maintains mitochondrial integrity and prevents spurious AIM2 inflammasome activation.

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Authors
Dang, E. V., McDonald, J. G., Russell, D. W., & Cyster, J. G.
Affiliations
  • Howard Hughes Medical Institute (US)
  • The University of Texas Southwestern Medical Center (US)
Corresponding author
  • Dang, Eric V.
  • Cyster, Jason G.
Venue
Cell
Publisher
Elsevier BV
Published
2017-11
Volume
171
Issue
5
Pages
1057-1071.e11
ISSN
0092-8674 (ISSN-L)
OpenAlex
W2763382180
Cited by
348
References
43
Citations by year
2026: 34 · 2025: 47 · 2024: 55 · 2023: 49 · 2022: 46 · 2021: 31 · 2020: 35 · 2019: 25 · 2018: 25
FWCI
9.25
Type
journal article
Language
en
Open access
Locations
  • Cell (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • eScholarship (California Digital Library) (submittedVersion)
Funders
  • UCSF DRC Center (P30 DK063720)
  • NIH (F30AI120527, AI040098, HL20948)
  • UCSF Medical Scientist Training Program (MSTP)
  • NIGMS (T32GM007618)
  • Howard Hughes Medical Institute
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Inflammasome and immune disorders
  • Life Sciences › Immunology and Microbiology › Immunology › Immune Response and Inflammation
  • Life Sciences › Immunology and Microbiology › Immunology › interferon and immune responses
Keywords
oxysterols, 25-hydroxycholesterol, cholesterol biosynthesis, AIM2 inflammasome, IL-1β, macrophages, cholesterol 25-hydroxylase, SREBP2, lipid metabolism, mitochondrial DNA release, mitochondrial respiration, lipopolysaccharide, bacterial infection, type I interferon
MeSH terms
Oxysterols, Animals, Cholesterol, DNA-Binding Proteins, DNA, Mitochondrial, Humans, Hydroxycholesterols, Inflammation, Listeriosis, Listeria monocytogenes, Macrophages, Membrane Proteins, Mitochondria, Intracellular Signaling Peptides and Proteins, Mice, Interleukin-1beta, Inflammasomes

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