Cited by 266Liver physiology and pathologyAutophagy in Disease and TherapyLiver Diseases and Immunity

Macrophage autophagy protects against liver fibrosis in mice

Open access
Lodder, Jasper, Denaës, Timothé, Chobert, Marie-Noële, Wan, JingHong, El-Benna, Jamel, Pawlotsky, Jean-Michel, Lotersztajn, Sophie, Teixeira-Clerc, Fatima·2015·Autophagy

Abstract

Autophagy is a lysosomal degradation pathway of cellular components that displays antiinflammatory properties in macrophages. Macrophages are critically involved in chronic liver injury by releasing mediators that promote hepatocyte apoptosis, contribute to inflammatory cell recruitment and activation of hepatic fibrogenic cells. Here, we investigated whether macrophage autophagy may protect against chronic liver injury. Experiments were performed in mice with mutations in the autophagy gene Atg5 in the myeloid lineage (Atg5(fl/fl) LysM-Cre mice, referred to as atg5(-/-)) and their wild-type (Atg5(fl/fl), referred to as WT) littermates. Liver fibrosis was induced by repeated intraperitoneal injection of carbon tetrachloride. In vitro studies were performed in cultures or co-cultures of peritoneal macrophages with hepatic myofibroblasts. As compared to WT littermates, atg5(-/-) mice exposed to chronic carbon tetrachloride administration displayed higher hepatic levels of IL1A and IL1B and enhanced inflammatory cell recruitment associated with exacerbated liver injury. In addition, atg5(-/-) mice were more susceptible to liver fibrosis, as shown by enhanced matrix and fibrogenic cell accumulation. Macrophages from atg5(-/-) mice secreted higher levels of reactive oxygen species (ROS)-induced IL1A and IL1B. Moreover, hepatic myofibroblasts exposed to the conditioned medium of macrophages from atg5(-/-) mice showed increased profibrogenic gene expression; this effect was blunted when neutralizing IL1A and IL1B in the conditioned medium of atg5(-/-) macrophages. Finally, administration of recombinant IL1RN (interleukin 1 receptor antagonist) to carbon tetrachloride-exposed atg5(-/-) mice blunted liver injury and fibrosis, identifying IL1A/B as central mediators in the deleterious effects of macrophage autophagy invalidation. These results uncover macrophage autophagy as a novel antiinflammatory pathway regulating liver fibrosis.

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Crossref · 10.1080/15548627.2015.1058473

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  • Activation of a noncanonical form of autophagy (LC3-associated phagocytosis) shifts the macrophage phenotype toward an anti-inflammatory stage with resulting antifibrogenic effects.

    “activation of a noncanonical form of autophagy (LC3-associated phagocytosis) shifts the macrophage phenotype toward an anti-inflammatory stage with resulting antifibrogenic effects (133, 134)”
  • Activation of autophagy protects against hepatocyte injury, improves endothelial dysfunction, and decreases the release of profibrogenic extracellular vesicles from hepatic stellate cells.

    “Besides its anti-inflammatory effects, activation of autophagy protects against hepatocyte injury, improves endothelial dysfunction, and decreases the release of profibrogenic extracellular vesicles from HSCs (133, 135–138).”
  • Atg5 deletion and genetic inhibition of LAP components in the myeloid compartment exacerbate hepatic inflammation in mice with chronic liver injury, thus enhancing liver fibrosis.

    “In particular, atg5 deletion (Lodder et al, 2015; Habib et al, 2019) and genetic inhibition of LAP components (Wan et al, 2020) in the myeloid compartment exacerbate hepatic inflammation in mice with chronic liver injury, thus enhancing liver fibrosis.”

    From Autophagy in major human diseases (2021) · cites this paper as Lodder et al, 2015

  • Autophagy is a limiting factor to a pro-inflammatory phenotype in macrophages.

    “and (ii) autophagy as a limiting factor to a pro‐inflammatory phenotype in macrophages.”

    From Autophagy in major human diseases (2021) · cites this paper as Lodder et al, 2015

  • In cirrhosis, myeloid cell-specific deletion of Atg5 causes exacerbated CCl4-induced liver fibrosis linked to enhanced inflammatory infiltrate.

    “| Cirrhosis | Myeloid cell‐specific deletion of Atg5 | Exacerbated CCl4‐induced liver fibrosis linked to enhanced inflammatory infiltrate | Lodder et al (2015), Habib et al (2019) |”

    From Autophagy in major human diseases (2021) · cites this paper as Lodder et al, 2015

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Authors
Lodder, J., Denaës, T., Chobert, M.-N., Wan, J., El-Benna, J., Pawlotsky, J.-M., Lotersztajn, S., & Teixeira-Clerc, F.
Affiliations
  • Inserm (FR)
  • INSERM UMR-1149; Centre de Recherche sur l'Inflammation; Paris; France
Corresponding author
  • Lotersztajn, Sophie
  • Teixeira-Clerc, Fatima
Venue
Autophagy
Published
2015-08-03
Volume
11
Issue
8
Pages
1280-1292
ISSN
  • 1554-8627 (ISSN-L)
  • 1554-8635
OpenAlex
W1807054663
Cited by
266
References
43
Citations by year
2026: 14 · 2025: 22 · 2024: 21 · 2023: 31 · 2022: 23 · 2021: 34 · 2020: 25 · 2019: 25 · 2018: 28 · 2017: 19 · 2016: 17 · 2015: 5 · 2014: 2
FWCI
13.63
Type
journal article
Language
en
Open access
Locations
  • Autophagy (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Agence Nationale de la Recherche (ANR-11-IDEX-0005)
  • Institut National de la Santé et de la Recherche Médicale (ANR-11-Idex-005-02)
Topics
  • Health Sciences › Medicine › Hepatology › Liver physiology and pathology
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
  • Health Sciences › Medicine › Hepatology › Liver Diseases and Immunity
Keywords
macrophage autophagy, liver fibrosis, ATG5, carbon tetrachloride-induced liver injury, interleukin-1 alpha, IL-1β, interleukin-1 receptor antagonist, hepatic myofibroblasts, reactive oxygen species, chronic inflammation, anti-inflammatory pathways
MeSH terms
Autophagy-Related Protein 5, Animals, Autophagy, Carbon Tetrachloride, Disease Models, Animal, Inflammation, Kupffer Cells, Liver, Liver Cirrhosis, Lysosomes, Macrophages, Microtubule-Associated Proteins, Mutation, Neutrophils, Recombinant Proteins, Culture Media, Conditioned, Reactive Oxygen Species, Macrophages, Peritoneal, Mice, Knockout, Cell Lineage, Mice, Interleukin-1alpha, Interleukin-1beta, Myofibroblasts

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