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Updated: Dec 11, 2025
Isolation and Profiling of MicroRNA-containing Exosomes from Human Bile
Published on: June 13, 2016
The Purification and Characterization of Exosomes from Macrophages
Eran Fridman1, Lana Ginini1, Ziv Gil2
1The Laboratory for Applied Cancer Research, Department of Otolaryngology, Head and Neck Surgery, The Head and Neck Center, Rambam Healthcare Campus, The Technion, Israel Institute of Technology, Haifa, Israel.
Abstract:
Macrophages play an essential role in diverse biological processes, from the immune response to inflammatory and neurodegenerative disorders, to various cancers. A macrophage subpopulation, known as tumor-associated macrophages (TAMs), has been shown to promote tumorigenesis, metastasis, and immune escape of cancer cells. Some of the pro-tumorigenic effects of TAMs are mediated via the secretion of nano-vesicles (exosomes) from macrophages to neighboring cells. In this chapter, we describe peritoneal macrophage isolation methods, polarization of TAMs, and purification and characterization of macrophage-derived exosomes.
Insights
Tumor-associated macrophages (TAMs) promote cancer growth and spread through secreted exosomes. This chapter details methods for isolating macrophages, polarizing TAMs, and purifying these cancer-promoting exosomes.
Area of Science:
- Immunology
- Cancer Biology
- Cell Biology
Background:
- Macrophages are crucial immune cells involved in various physiological and pathological processes.
- Tumor-associated macrophages (TAMs) are a specific subtype that supports cancer progression, metastasis, and immune evasion.
- TAMs exert pro-tumorigenic effects, partly through the release of nano-vesicles called exosomes.
Purpose of the Study:
- To provide detailed methodologies for studying macrophage-derived exosomes in cancer.
- To outline techniques for isolating peritoneal macrophages.
- To describe the polarization of macrophages into TAMs and the subsequent purification and characterization of their exosomes.
Main Methods:
- Isolation of peritoneal macrophages from biological samples.
- Induction and polarization of macrophages towards a TAM phenotype.
- Ultracentrifugation and filtration techniques for exosome purification.
- Characterization of purified exosomes using techniques like nanoparticle tracking analysis and western blotting.
Main Results:
- Established protocols for obtaining pure macrophage populations.
- Successful polarization of macrophages into a pro-tumorigenic TAM state.
- Purified and characterized exosomes derived from TAMs, confirming their potential role in intercellular communication within the tumor microenvironment.
Conclusions:
- The described methods enable the isolation and characterization of macrophage-derived exosomes.
- Understanding these exosomes is critical for elucidating TAM functions in cancer.
- These techniques provide a foundation for developing targeted cancer therapies by interfering with exosome-mediated signaling.
