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The Role of Macrophages in Tumors

A special issue of International Journal of Molecular Sciences (ISSN 1422-0067). This special issue belongs to the section "Molecular Immunology".

Deadline for manuscript submissions: 20 August 2025 | Viewed by 1375

Special Issue Editor


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Guest Editor
Institute of Transfusion Medicine and Immunology, Mannheim Institute for Innate Immunoscience (MI3), Medical Faculty Mannheim, Heidelberg University, 68167 Mannheim, Germany
Interests: transcriptional, epigenetic, and metabolic programming of macrophages and their precoursors—corculating monocytes; tumor immunometabolism; macrophage biomarkers of therapy resistance; new molecular targets for TAM reprogramming in solid tumors
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Special Issue Information

Dear Colleagues,

Tumor-associated macrophages (TAMs) are key innate immune cells in the tumor microenvironment (TME) that regulate growth of primary tumors, anti-tumor adaptive immune response, tumor angiogenesis, extracellular matrix remodeling, intravasation in the vasculature, and extravasation in metastatic sites. TAMs can establish beneficial conditions for metastatic cells in the secondary organs. TAMs interfere with the actions of a number of classical chemotherapeutic agents and are critical for the success of new immunotherapeutic tools. Scavenging, signaling, intracellular vesicular transport, transcriptional, epigenetic, and metabolic mechanisms cooperate to form functional TAM phenotypes and, at the same time, offer new options to develop TAM anti-tumor programming agents.

We are pleased to invite you to contribute original papers (full size or brief definite reports) as well as review articles in all fields of tumor-associated macrophages: basic biology and functions, their interaction with cancer cells and other cells in the TME, their role in hematogenous and lymphatic metastasis, TAM interactions with therapeutic agents, as well as TAM biomarkers and functions in cancer patients.

The aim of this Special Issue is to identify critical mechanisms in TAMs that interfere with the success of already developed therapeutic agents and to identify new options for targeting TAMs and reprogramming them to the potent anti-tumor effectors.

Research areas may include (but are not limited to) the following:

  1. Molecular mechanisms of TAM functions.
  2. TAMs epigenetics.
  3. TAMs metabolism.
  4. Phagocytosis and endocytosis in TAMs.
  5. Monocyte programming that defines TAM differentiation.
  6. Roles of cancer-related pathogenesis in TAM programming.
  7. TAMs and chemotherapy.
  8. TAMs and radiotherapy.
  9. TAMs in immunotherapy
  10. Biomarkers of TAMs for patients’ stratification.
  11. New targets for TAM programming.
  12. Translational research on TAMs and clinical applications.

We look forward to receiving your contributions.

Prof. Dr. Julia Kzhyshkowska
Guest Editor

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Keywords

  • tumor-associated macrophages
  • transcriptome
  • metabolome
  • epigenetics
  • angiogenesis
  • metastasis
  • immunotherapy

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Published Papers (1 paper)

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Research

17 pages, 1349 KiB  
Article
Polarized Macrophages Show Diverse Pro-Angiogenic Characteristics Under Normo- and Hyperglycemic Conditions
by Mahnaz Shariatzadeh, César Payán-Gómez, Julia Kzhyshkowska, Willem A. Dik and Pieter J. M. Leenen
Int. J. Mol. Sci. 2025, 26(10), 4846; https://doi.org/10.3390/ijms26104846 - 19 May 2025
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Abstract
Angiogenesis plays a crucial role in solid tumor growth. Ischemia and inflammation induce various angiogenic mediators, and patient metabolic conditions importantly influence this process. Macrophages closely interact with the vascular system and regulate angiogenesis through pro/anti-angiogenic factors. Traditionally, pro-angiogenic activity has been attributed [...] Read more.
Angiogenesis plays a crucial role in solid tumor growth. Ischemia and inflammation induce various angiogenic mediators, and patient metabolic conditions importantly influence this process. Macrophages closely interact with the vascular system and regulate angiogenesis through pro/anti-angiogenic factors. Traditionally, pro-angiogenic activity has been attributed to M2-like macrophages. We question this, as recent evidence suggests that also M1-like macrophages can be pro-angiogenic. Therefore, the aim is to identify the pro/anti-angiogenic gene expression profiles of human polarized macrophages unbiasedly. We also examine the effect of hyperglycemia on angiogenic gene expression, reflecting its role in diabetes and other metabolic conditions. Bioinformatic analysis was performed on the angiogenesis-related gene expression profiles of CD14+ monocyte-derived M1(IFN-γ)- and M2(IL-4)-polarized macrophages. The top differentially expressed genes were selected for validation. Macrophages were generated in vitro and polarized to M1(IFN-γ) and M2(IL-4/IL-6) cells under standard/hyperglycemic conditions. After immunophenotypic confirmation, selected gene expression was quantified using qPCR. IL-4 and IL-6 induce distinct M2-like phenotypes with mixed pro/anti-angiogenic gene expression. Remarkably, IFN-γ stimulation also increases several pro-angiogenic genes. Hyperglycemia affects the angiogenic expression profile in both M1- and M2-like macrophages, although distinctive identities remain intact. The pro-angiogenic phenotype is not limited to M2-polarized macrophages. Both M1- and M2-like macrophages express complex pro/anti-angiogenic gene profiles, which are only mildly influenced by hyperglycemia. Full article
(This article belongs to the Special Issue The Role of Macrophages in Tumors)
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