Cited by 122Gene Regulatory Network AnalysisImmune cells in cancerBioinformatics and Genomic Networks

Gene regulatory network modeling of macrophage differentiation corroborates the continuum hypothesis of polarization states

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Palma, Alessandro, Jarrah, Abdul Salam, Tieri, Paolo, Cesareni, Gianni, Castiglione, Filippo·2018·Frontiers in Physiology

Abstract

Macrophages derived from monocyte precursors undergo specific polarization processes which are influenced by the local tissue environment: classically-activated (M1) macrophages, with a pro-inflammatory activity and a role of effector cells in Th1 cellular immune responses, and alternatively-activated (M2) macrophages, with anti-inflammatory functions and involved in immunosuppression and tissue repair. At least three different subsets of M2 macrophages, namely M2a, M2b and M2c, are characterized in the literature based on their eliciting signals. The activation and polarization of macrophages is achieved through many, often intertwined, signaling pathways. To describe the logical relationships among the genes involved in macrophage polarization, we used a computational modeling methodology, namely, logical (Boolean) modeling of gene regulation. We integrated experimental data and knowledge available in the literature to construct a logical network model for the gene regulation driving macrophage polarization to the M1, M2a, M2b and M2c phenotypes. Using the software GINsim and BoolNet we analysed the network dynamics under different conditions and perturbations to understand how they affect cell polarization. Dynamic simulations of the network model, enacting the most relevant biological conditions, showed coherence with the observed behaviour of in vivo macrophages. The model could correctly reproduce the polarization toward the four main phenotypes as well as to several hybrid phenotypes, which are known to be experimentally associated to physiological and pathological conditions. We surmise that shifts among different phenotypes in the model mimic the hypothetical continuum of macrophage polarization, with M1 and M2 being the extremes of an uninterrupted sequence of states. Furthermore, model simulations suggest that anti-inflammatory macrophages are resilient to shift back to the pro-inflammatory phenotype.

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  1. Thomas R. D’Ari R. (1990). Biological Feedback. Boca Raton, FL: CRC Press.

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Authors
Palma, A., Jarrah, A. S., Tieri, P., Cesareni, G., & Castiglione, F.
Affiliations
  • University of Rome Tor Vergata (IT)
  • American University of Sharjah (AE)
  • National Research Council (IT)
Corresponding author
Castiglione, Filippo
Venue
Frontiers in Physiology
Published
2018-11-27
Volume
9
Pages
1659-1659
ISSN
1664-042X (ISSN-L)
OpenAlex
W2903465911
Cited by
122
References
112
Citations by year
2026: 11 · 2025: 8 · 2024: 8 · 2023: 16 · 2022: 28 · 2021: 22 · 2020: 23 · 2019: 5 · 2018: 1
FWCI
4.54
Type
journal article
Language
en
Open access
Locations
  • Frontiers in Physiology (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • IRIS Research product catalog (Sapienza University of Rome) (submittedVersion, cc-by)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • European Commission (600803)
  • Associazione Italiana per la Ricerca sul Cancro (IG-2017, 20322)
  • FP7 Ideas: European Research Council (322749)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Gene Regulatory Network Analysis
  • Life Sciences › Immunology and Microbiology › Immunology › Immune cells in cancer
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Bioinformatics and Genomic Networks
Keywords
macrophage polarization, macrophage differentiation, M1 macrophages, M2 macrophages, continuum hypothesis, logical modeling, network dynamics, Th1 response, tissue repair

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