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Updated: Apr 19, 2026
Bone Marrow-derived Macrophage Production
Published on: November 22, 2013
High-resolution quantitative proteome analysis reveals substantial differences between phagosomes of RAW 264.7 and
Manman Guo1, Anetta Härtlova1, Brian D Dill1
1MRC Protein Phosphorylation and Ubiquitylation Unit, College of Life Science, University of Dundee, Scotland, UK.
Abstract:
Macrophages are important immune cells operating at the forefront of innate immunity by taking up foreign particles and microbes through phagocytosis. The RAW 264.7 cell line is commonly used for experiments in the macrophage and phagocytosis field. However, little is known how its functions compare to primary macrophages. Here, we have performed an in-depth proteomics characterization of phagosomes from RAW 264.7 and bone marrow derived macrophages by quantifying more than 2500 phagosomal proteins. Our data indicate that there are significant differences for a large number of proteins including important receptors such as mannose receptor 1 and Siglec-1. Moreover, bone marrow derived macrophages phagosomes mature considerably faster by fusion with endosomes and the lysosome which we validated using fluorogenic phagocytic assays. We provide a valuable resource for researcher in the field and recommend careful use of the RAW 264.7 cell line when studying phagosome functions. All MS data have been deposited in the ProteomeXchange with identifier PXD001293 (http://proteomecentral.proteomexchange.org/dataset/PXD001293).
Insights
RAW 264.7 cells differ significantly from primary macrophages in phagosome function and maturation. Researchers should use caution with this cell line for phagocytosis studies.
Area of Science:
- Immunology
- Cell Biology
- Proteomics
Background:
- Macrophages are key innate immune cells involved in phagocytosis.
- The RAW 264.7 cell line is widely used to study macrophage phagocytosis.
- Limited data exists comparing RAW 264.7 cells to primary macrophages.
Purpose of the Study:
- To conduct an in-depth proteomics comparison of phagosomes from RAW 264.7 cells and primary bone marrow-derived macrophages.
- To identify differences in protein composition and functional maturation between these two macrophage sources.
Main Methods:
- Proteomic analysis of phagosomes isolated from RAW 264.7 cells and bone marrow-derived macrophages.
- Quantification of over 2500 phagosomal proteins.
- Validation of phagosome maturation using fluorogenic phagocytic assays.
Main Results:
- Significant differences in protein content were observed between RAW 264.7 and primary macrophage phagosomes.
- Key receptors, including mannose receptor 1 and Siglec-1, showed differential expression.
- Primary macrophage phagosomes exhibited accelerated maturation through fusion with endosomes and lysosomes.
Conclusions:
- RAW 264.7 cells display distinct phagosomal characteristics compared to primary macrophages.
- The study highlights significant functional and compositional differences, particularly in receptor presence and maturation rates.
- Researchers are advised to exercise caution when using RAW 264.7 cells as a model for primary macrophage phagocytosis.
