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Updated: Mar 21, 2026
Macrophage Differentiation and Polarization into an M2-Like Phenotype using a Human Monocyte-Like THP-1 Leukemia Cell Line
Published on: August 2, 2021
Tumor cell-derived microparticles polarize M2 tumor-associated macrophages for tumor progression
Ruihua Ma1, Tiantian Ji1, Degao Chen2
1Department of Biochemistry and Molecular Biology, Tongji Medical College, Huazhong University of Science and Technology , Wuhan, China.
Abstract:
Despite identification of macrophages in tumors (tumor-associated macrophages, TAM) as potential targets for cancer therapy, the origin and function of TAM in the context of malignancy remain poorly characterized. Here, we show that microparticles (MPs), as a by-product, released by tumor cells act as a general mechanism to mediate M2 polarization of TAM. Taking up tumor MPs by macrophages is a very efficient process, which in turn results in the polarization of macrophages into M2 type, not only leading to promoting tumor growth and metastasis but also facilitating cancer stem cell development. Moreover, we demonstrate that the underlying mechanism involves the activation of the cGAS/STING/TBK1/STAT6 pathway by tumor MPs. Finally, in addition to murine tumor MPs, we show that human counterparts also possess consistent effect on human M2 polarization. These findings provide new insights into a critical role of tumor MPs in remodeling of tumor microenvironment and better understanding of the communications between tumors and macrophages.
Insights
Tumor microparticles (MPs) drive M2 polarization of tumor-associated macrophages (TAM), promoting cancer growth, metastasis, and stem cell development via the cGAS/STING pathway. This interaction is conserved across species.
Area of Science:
- Oncology
- Immunology
- Cell Biology
Background:
- Tumor-associated macrophages (TAM) are key players in cancer, but their origin and function are not fully understood.
- Targeting TAM is a promising cancer therapy strategy.
Purpose of the Study:
- To investigate the role of tumor-released microparticles (MPs) in TAM polarization and function.
- To elucidate the molecular mechanisms underlying tumor MP-mediated TAM polarization.
Main Methods:
- Analysis of microparticle uptake by macrophages.
- Assessment of macrophage polarization (M2 phenotype).
- Investigation of the cGAS/STING/TBK1/STAT6 signaling pathway activation.
- Comparative studies using murine and human tumor MPs.
Main Results:
- Tumor-derived MPs efficiently polarize macrophages into M2 TAM.
- M2 TAM polarization promotes tumor growth, metastasis, and cancer stem cell development.
- Tumor MPs activate the cGAS/STING/TBK1/STAT6 pathway, mediating M2 polarization.
- Human tumor MPs exhibit similar M2 polarization effects as murine MPs.
Conclusions:
- Tumor MPs are a critical mechanism for remodeling the tumor microenvironment by inducing M2 TAM polarization.
- Understanding tumor MP-macrophage communication offers new therapeutic avenues for cancer treatment.
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