Cited by 1,003Liver physiology and pathologyImmune cells in cancerLiver Disease Diagnosis and Treatment

Targeting hepatic macrophages to treat liver diseases

Tacke, Frank·2017·Journal of Hepatology

Abstract

Our view on liver macrophages in the context of health and disease has been reformed by the recognition of a remarkable heterogeneity of phagocytes in the liver. Liver macrophages consist of ontogenically distinct populations termed Kupffer cells and monocyte-derived macrophages. Kupffer cells are self-renewing, resident and principally non-migratory phagocytes, serving as sentinels for liver homeostasis. Liver injury triggers Kupffer cell activation, leading to inflammatory cytokine and chemokine release. This fosters the infiltration of monocytes into the liver, which give rise to large numbers of inflammatory monocyte-derived macrophages. Liver macrophages are very plastic and adapt their phenotype according to signals derived from the hepatic microenvironment (e.g. danger signals, fatty acids, phagocytosis of cellular debris), which explains their manifold and even opposing functions during disease. These central functions include the perpetuation of inflammation and hepatocyte injury, activation of hepatic stellate cells with subsequent fibrogenesis, and support of tumor development by angiogenesis and T cell suppression. If liver injury ceases, specific molecular signals trigger hepatic macrophages to switch their phenotype towards reparative phagocytes that promote tissue repair and regression of fibrosis. Novel strategies to treat liver disease aim at targeting macrophages. These interventions modulate Kupffer cell activation (e.g. via gut-liver axis or inflammasome formation), monocyte recruitment (e.g. via inhibiting chemokine pathways like CCR2 or CCL2) or macrophage polarization and differentiation (e.g. by nanoparticles). Evidence from mouse models and early clinical studies in patients with non-alcoholic steatohepatitis and fibrosis support the notion that pathogenic macrophage subsets can be successfully translated into novel treatment options for patients with liver disease. Lay summary Macrophages (Greek for "big eaters") are a frequent non-parenchymal cell type of the liver that ensures homeostasis, antimicrobial defense and proper metabolism. However, liver macrophages consist of different subtypes regarding their ontogeny (developmental origin), differentiation and function. Understanding this heterogeneity and the critical regulation of inflammation, fibrosis and cancer by macrophage subsets opens promising new options for treating liver diseases.

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Crossref · 10.1016/j.jhep.2017.02.026

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  • Macrophages play a central role in regulating liver fibrosis.

    “The central role of macrophages in regulating liver fibrosis is now well recognized11,23.”
  • Liver macrophages may detect ECM stiffening via mechanotransduction, subsequently differentiating into M1 or M2 phenotypes, leading to the production of cytokines and chemokines and the regulation of HSCs, ultimately influencing the progression and reversal of liver fibrosis.

    “Liver macrophages may detect ECM stiffening via mechanotransduction, subsequently differentiating into M1 or M2 phenotypes. This differentiation leads to the production of cytokines and chemokines as well as the regulation of HSCs through intercellular communication, ultimately influencing the progression and reversal of liver fibrosis.”
  • There is a significant interaction and interplay between mechanotransduction and biochemical signal transduction within the liver fibrosis process.

    “This suggests a significant interaction and interplay between mechanotransduction and biochemical signal transduction within the liver fibrosis process.76,77”

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Authors
Tacke, F.
Affiliations
Universitätsklinikum Aachen (DE)
Corresponding author
Tacke, Frank
Venue
Journal of Hepatology
Publisher
Elsevier BV
Published
2017-06
Volume
66
Issue
6
Pages
1300-1312
ISSN
0168-8278 (ISSN-L)
OpenAlex
W2594491387
Cited by
1,003
References
18
Citations by year
2026: 74 · 2025: 124 · 2024: 118 · 2023: 125 · 2022: 149 · 2021: 112 · 2020: 111 · 2019: 91 · 2018: 71 · 2017: 27 · 2013: 1
FWCI
11.83
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Hepatology (publishedVersion)
  • PubMed (publishedVersion)
  • RWTH Publications (RWTH Aachen) (submittedVersion)
Funders
  • German Research Foundation (Ta434/3-1, Ta434/5-1, SFB/TRR57)
  • IZKF
Topics
  • Health Sciences › Medicine › Hepatology › Liver physiology and pathology
  • Life Sciences › Immunology and Microbiology › Immunology › Immune cells in cancer
  • Health Sciences › Medicine › Epidemiology › Liver Disease Diagnosis and Treatment
Keywords
hepatic macrophages, Kupffer cells, monocyte-derived macrophages, macrophage heterogeneity, liver fibrosis, nonalcoholic steatohepatitis, macrophage polarization, reparative macrophages, liver inflammation, hepatic stellate cells, tumor-associated macrophages, gut-liver axis, inflammasome, chemokine inhibition, CCR2, MCP-1, nanoparticles, liver disease treatment
MeSH terms
Animals, Cholestasis, Hepatitis, Viral, Animal, Homeostasis, Humans, Kupffer Cells, Liver Cirrhosis, Liver Diseases, Liver Neoplasms, Experimental, Macrophages, Chemical and Drug Induced Liver Injury

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