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Updated: Aug 12, 2026
Isolation of Murine Peritoneal Macrophages to Carry Out Gene Expression Analysis Upon Toll-like Receptors Stimulation
Published on: April 29, 2015
Surface antigens of the murine cytostatic peritoneal macrophage
Abstract:
By rosetting techniques, peritoneal exudate cells (PEC) from mice stimulated intraperitoneally with starch have been shown to be a mixed population of cells consisting of the following subpopulations of cells: 75% FcR, 26% C3R, 18% Ig+, 29% Ia+, Ig- and 5% Thy-1+, Ig-. By separating rosetting from non-rosetting cells, it was possible to establish the phenotype of the PEC which was cytostatic for tumour cells. This cell possessed receptors for Fc and C3 but lacked surface Ig, the Thy-1 antigen and I-region controlled antigens and was NSE positive. Thus by presently available criteria, the cytostatic PEC can be identified as a macrophage. The lack of Ia distinguishes this type of macrophage from the antigen-presenting macrophage which bears Ia.
Insights
Peritoneal exudate cells (PEC) from mice were analyzed for their role in tumor cell cytostasis. Macrophages, identified by Fc and C3 receptors but lacking Ia antigens, were found to be cytostatic for tumor cells.
Area of Science:
- Immunology
- Cell Biology
Background:
- Peritoneal exudate cells (PEC) are a heterogeneous population involved in immune responses.
- Tumor cell cytostasis is a critical mechanism in cancer immunity.
Purpose of the Study:
- To characterize the phenotype of PEC responsible for cytostatic activity against tumor cells.
- To identify the specific subpopulation of PEC exhibiting tumoricidal properties.
Main Methods:
- Rosetting techniques were employed to separate PEC subpopulations.
- Flow cytometry and cell surface marker analysis were used to define cell phenotypes.
- Cytostatic activity against tumor cells was assessed.
Main Results:
- PEC populations were characterized by Fc receptor (FcR), C3 receptor (C3R), immunoglobulin (Ig), I-region associated (Ia) antigen, and Thy-1 expression.
- A distinct PEC subpopulation, positive for Fc and C3 receptors but negative for surface Ig, Thy-1, and Ia antigens, demonstrated cytostatic effects on tumor cells.
- This cytostatic cell type was identified as a macrophage, specifically one lacking Ia antigens.
Conclusions:
- The study identifies a specific macrophage subpopulation within PEC as being responsible for tumor cell cytostasis.
- The absence of Ia antigens differentiates these cytostatic macrophages from antigen-presenting macrophages.
