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Updated: Jul 9, 2025
Macrophage Differentiation and Polarization into an M2-Like Phenotype using a Human Monocyte-Like THP-1 Leukemia Cell Line
Published on: August 2, 2021
Macrophage polarization toward M1 phenotype in T cell transfer colitis model
Shin Ebihara1, Toshiki Urashima2, Wataru Amano2
1Biological/Pharmacological Research Laboratories, Takatsuki Research Center, Central Pharmaceutical Research Institute, Japan Tobacco, Inc, 1-1 Murasaki-cho, Takatsuki, Osaka, 569-1125, Japan. shin.ebihara@jt.com.
In a T cell transfer colitis model, macrophages shift to an M1 phenotype, driving inflammation and T cell activation. This model is valuable for studying macrophage roles in inflammatory bowel disease (IBD) and testing new therapies.
Area of Science:
- Immunology
- Gastroenterology
- Cell Biology
Background:
- The T cell transfer colitis model is crucial for studying intestinal CD4+ T cell functions.
- The precise roles of macrophages in colitis pathogenesis remain incompletely understood.
Purpose of the Study:
- To investigate the phenotype and function of macrophages within the colonic lamina propria (LP) during colitis development.
- To assess macrophage polarization towards M1 or M2 phenotypes in a T cell-mediated colitis model.
Main Methods:
- Induction of colitis in scid mice via CD4+CD45RBhi T cell transfer.
- Flow cytometry and quantitative RT-PCR to analyze macrophage populations, cytokine expression, and M1/M2 markers in the colonic LP.
- Co-culture experiments to evaluate macrophage-T cell interactions and T cell activation.
Main Results:
- Macrophage infiltration into the colon increased during colitis development.
- A shift towards M1 macrophage polarization was observed, with increased M1 and decreased M2 markers in the colonic LP.
- M1 macrophages were identified as key producers of inflammatory cytokines, promoting colitogenic T cell activation.
Conclusions:
- Macrophages polarize to the M1 phenotype in the colonic LP during T cell transfer-induced colitis.
- This model effectively mimics aspects of human inflammatory bowel disease (IBD) and is suitable for evaluating macrophage-targeted therapies.
- The model facilitates deeper understanding of in vivo macrophage functions relevant to IBD pathogenesis.
