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Updated: Apr 5, 2026
Polarization and Characterization of M1 and M2 Human Monocyte-Derived Macrophages on Implant Surfaces
Published on: December 6, 2024
Impact of Detachment Methods on M2 Macrophage Phenotype and Function
Shaodong Chen1, Edward C So2, Scott E Strome2
1Department of Otorhinolaryngology-Head and Neck Surgery, University of Maryland School of Medicine, USA; Medical College of Xiamen University, China.
Abstract:
The methods of cell detachment influence phenotype and function of human macrophages cultured in vitro. However, comparative studies defining the influence of cell detachment techniques on secondary characterization of M1 or M2 polarized macrophages are largely absent from the literature. In this study we evaluated the impact of trypsin, accutase, EDTA, PBS, and cell scraping on: A. cell recovery, B. phenotype and C. function of in vitro polarized macrophages. Our data demonstrate that while exposure to trypsin or accutase yields highly efficient recovery of viable cells, such chemical cleavage results in loss of select M2 cell surface markers with correlative changes in cell function. In contrast, phenotype and function are maintained following detachment by EDTA on ice. Our data suggest that seemingly "trivial" changes in methodologies for macrophage detachment induce both variable and profound changes on cell phenotype and function which can dramatically impact the results of polarization experiments.
Insights
Cell detachment methods significantly alter human macrophage phenotype and function. EDTA detachment on ice preserves macrophage characteristics, unlike trypsin or accutase, impacting polarization experiments.
Area of Science:
- Immunology
- Cell Biology
- Biotechnology
Background:
- Human macrophages are crucial immune cells with distinct M1 and M2 polarization states.
- Cell detachment methods are essential for in vitro macrophage culture but their impact on polarization is understudied.
Purpose of the Study:
- To investigate how different cell detachment techniques affect human macrophage recovery, phenotype, and function.
- To identify detachment methods that preserve macrophage characteristics for accurate M1/M2 polarization studies.
Main Methods:
- Human macrophages were cultured in vitro and polarized.
- Cells were detached using trypsin, accutase, EDTA, PBS, or cell scraping.
- Cell recovery, surface marker expression (phenotype), and functional assays were performed.
Main Results:
- Trypsin and accutase provided high cell recovery but altered M2 markers and function.
- EDTA detachment on ice maintained macrophage phenotype and function.
- PBS and cell scraping showed variable effects on cell recovery and characteristics.
Conclusions:
- Cell detachment methodology profoundly impacts in vitro macrophage phenotype and function.
- EDTA detachment on ice is recommended for preserving macrophage characteristics in polarization studies.
- Standardizing detachment protocols is critical for reproducible macrophage research.
