Cited by 3,160Immune cells in cancerPhagocytosis and Immune RegulationImmune Response and Inflammation

Macrophage activation and polarization

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Martinez, Fernando Oneissi·2008·Frontiers in Bioscience

Abstract

Macrophages are widely distributed immune system cells that play an indispensable role in homeostasis and defense. They can be phenotypically polarized by the microenvironment to mount specific functional programs. Polarized macrophages can be broadly classified in two main groups: classically activated macrophages (or M1), whose prototypical activating stimuli are IFNgamma and LPS, and alternatively activated macrophages (or M2), further subdivided in M2a (after exposure to IL-4 or IL-13), M2b (immune complexes in combination with IL-1beta or LPS) and M2c (IL-10, TGFbeta or glucocorticoids). M1 exhibit potent microbicidal properties and promote strong IL-12-mediated Th1 responses, whilst M2 support Th2-associated effector functions. Beyond infection M2 polarized macrophages play a role in resolution of inflammation through high endocytic clearance capacities and trophic factor synthesis, accompanied by reduced pro-inflammatory cytokine secretion. Similar functions are also exerted by tumor-associated macrophages (TAM), which also display an alternative-like activation phenotype and play a detrimental pro-tumoral role. Here we review the main functions of polarized macrophages and discuss the perspectives of this field.

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  • The M2c subset is induced by IL-10 and plays a major role in tissue remodeling and suppression of inflammatory immune reactions by secreting TGF-b and IL-10.

    “Alternatively, the M2c subset is induced by IL-10 and plays a major role in tissue remodeling and suppression of inflammatory immune reactions by secreting transforming growth factor-b (TGF-b) and IL-10 [1,23].”

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Authors
Martinez, F. O.
Venue
Frontiers in Bioscience
Publisher
IMR Press
Published
2008
Volume
13
Issue
13
Pages
453
ISSN
  • 1093-4715 (ISSN-L)
  • 1093-9946
OpenAlex
W2020744745
Cited by
3,160
References
60
Citations by year
2026: 51 · 2025: 116 · 2024: 150 · 2023: 154 · 2022: 211 · 2021: 231 · 2020: 225 · 2019: 197 · 2018: 174 · 2017: 180 · 2016: 190 · 2015: 236 · 2014: 215 · 2013: 193 · 2012: 175
FWCI
7.54
Type
journal article
Language
en
Open access
Locations
  • Frontiers in bioscience (publishedVersion)
  • PubMed (publishedVersion)
  • Open Research (University of Surrey) (submittedVersion)
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › Immune cells in cancer
  • Life Sciences › Immunology and Microbiology › Immunology › Phagocytosis and Immune Regulation
  • Life Sciences › Immunology and Microbiology › Immunology › Immune Response and Inflammation
Keywords
macrophage polarization, macrophage activation, M1 macrophages, M2 macrophages, interferon-gamma, lipopolysaccharide, IL-4, IL-13, IL-1β, IL-10, TGF-beta, glucocorticoids, Th1 response, Th2 immune response, inflammation resolution, tumor-associated macrophages, immune homeostasis
MeSH terms
Animals, Anti-Inflammatory Agents, Humans, Immune System, Inflammation, Leukocytes, Mononuclear, Macrophage Activation, Macrophages, Models, Biological, Neoplasms, Phagocytes, Th1 Cells, Th2 Cells

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