Cited by 148Liver physiology and pathologyInflammasome and immune disordersLiver Disease Diagnosis and Treatment

NLR Family Pyrin Domain-Containing 3 Inflammasome Activation in Hepatic Stellate Cells Induces Liver Fibrosis in Mice

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Inzaugarat, Maria Eugenia, Johnson, Casey D., Holtmann, Theresa Maria, McGeough, Matthew D., Trautwein, Christian, Papouchado, Bettina G., Schwabe, Robert, Hoffman, Hal M. +2 more·2019·Hepatology

Abstract

The NLR family pyrin domain‐containing 3 (NLRP3) inflammasome plays an important role in liver fibrosis (LF) development. However, the mechanisms involved in NLRP3‐induced fibrosis are unclear. Our aim was to test the hypothesis that the NLRP3 inflammasome in hepatic stellate cells (HSCs) can directly regulate their activation and contribute to LF. Primary HSCs isolated from wild‐type (WT), Nlrp3–/– , or Nlrp3L351PneoR knock‐in crossed to inducible (estrogen receptor Cre‐CreT) mice were incubated with lipopolysaccharide (LPS) and adenosine triphosphate (ATP), or 4OH‐tamoxifen, respectively. HSC‐specific Nlrp3L351P knock‐in mice were generated by crossing transgenic mice expressing lecithin retinol acyltransferase (Lrat)‐driven Cre and maintained on standard rodent chow for 6 months. Mice were then sacrificed; liver tissue and serum were harvested. Nlrp3 inflammasome activation along with HSC phenotype and fibrosis were assessed by RT‐PCR, western blotting, fluorescence‐activated cell sorting (FACS), enzyme‐linked immunosorbent assay, immunofluorescence (IF), and immunohistochemistry (IHC). Stimulated WT HSCs displayed increased levels of NLRP3 inflammasome‐induced reactive oxygen species (ROS) production and cathepsin B activity, accompanied by an up‐regulation of mRNA and protein levels of fibrotic makers, an effect abrogated in Nlrp3–/– HSCs. Nlrp3L351P CreT HSCs also showed elevated mRNA and protein expression of fibrotic markers 24 hours after inflammasome activation induced with 4‐hydroxytamoxifen (4OHT). Protein and mRNA expression levels of fibrotic markers were also found to be increased in isolated HSCs and whole liver tissue from Nlrp3L351P Lrat Cre mice compared to WT. Liver sections from 24‐week‐old NlrpL351P Lrat Cre mice showed fibrotic changes with increased alpha smooth muscle actin (αSMA) and desmin‐positive cells and collagen deposition, independent of inflammatory infiltrates; these changes were also observed after LPS challenge in 8‐week‐old NlrpL351P Lrat Cre mice. Conclusion : Our results highlight a direct role for the NLRP3 inflammasome in the activation of HSCs directly triggering LF.

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Crossref · 10.1002/hep.30252

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  • Selective expression of a constitutively active transgenic NLRP3 in mouse HSCs is sufficient to induce fibrosis.

    “Selective expression of a constitutively active transgenic NLRP3 in mouse HSCs is sufficient to induce fibrosis (75).”

    From Hepatic Stellate Cell-Immune Interactions in NASH (2022) · cites this paper as [75]

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Authors
Inzaugarat, M. E., Johnson, C. D., Holtmann, T. M., McGeough, M. D., Trautwein, C., Papouchado, B. G., Schwabe, R., Hoffman, H. M., Wree, A., & Feldstein, A. E.
Affiliations
  • Department of Internal Medicine III,RWTH University Hospital Aachen,Aachen,Germany
  • University of California San Diego (US)
  • Universitätsklinikum Aachen (DE)
  • Columbia University (US)
Corresponding author
  • Wree, Alexander
  • Feldstein, Ariel E.
Venue
Hepatology
Published
2019-01-03
Volume
69
Issue
2
Pages
845-859
ISSN
  • 0270-9139 (ISSN-L)
  • 1527-3350
OpenAlex
W2891702824
Cited by
148
References
34
Citations by year
2026: 14 · 2025: 20 · 2024: 15 · 2023: 22 · 2022: 29 · 2021: 23 · 2020: 21 · 2019: 4
FWCI
7.52
Type
journal article
Language
en
Open access
Locations
  • Hepatology (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • RWTH Publications (RWTH Aachen) (submittedVersion)
Funders
  • Deutsche Forschungsgemeinschaft (SFB‐TRR57, WR173/2‐1)
  • National Institutes of Health
  • National Institute on Alcohol Abuse and Alcoholism (R01AA024206, U01AA024206)
  • National Institute of Diabetes and Digestive and Kidney Diseases (R01DK113592)
Topics
  • Health Sciences › Medicine › Hepatology › Liver physiology and pathology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Inflammasome and immune disorders
  • Health Sciences › Medicine › Epidemiology › Liver Disease Diagnosis and Treatment
Keywords
NLRP3 inflammasome, liver fibrosis, hepatic stellate cells, inflammasome activation, reactive oxygen species, cathepsin B, 4-hydroxytamoxifen, lipopolysaccharide, ATP, alpha-smooth muscle actin, desmin, collagen deposition
MeSH terms
NLR Family, Pyrin Domain-Containing 3 Protein, Animals, Female, Lipopolysaccharides, Liver, Liver Cirrhosis, Male, Mice, Inbred C57BL, Mice, Transgenic, Biomarkers, Hepatic Stellate Cells, Myofibroblasts, Inflammasomes

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