Related Experiment Video
Updated: Apr 15, 2026
Investigation of Macrophage Polarization Using Bone Marrow Derived Macrophages
Published on: June 23, 2013
Microgravity activates p38 MAPK-C/EBPβ pathway to regulate the expression of arginase and inflammatory cytokines in
Chongzhen Wang1, Hui Chen, Haiying Luo
1Transplantation Biology Research Division, State Key Laboratory of Biomembrane and Membrane Biotechnology, Institute of Zoology, Chinese Academy of Sciences, Beichen West Road 1-5, Chaoyang District, Beijing, 100101, China.
Objective And Design:
Molecular mechanisms of microgravity-caused immunosuppression are not fully elucidated. In the present study, we investigated the effects of simulated microgravity on macrophage functions and tried to identify the related intracellular signal pathways.
Material Or Subjects:
Primary mouse macrophages were used in the present study. The gene expression and function of IL-4-treated mouse macrophages were detected after simulated microgravity or 1 g control.
Methods:
Freshly isolated primary mouse macrophages were cultured in a standard simulated microgravity situation using a rotary cell culture system (RCCS-1) and 1 g control conditions. Real-time PCR, western blots and flow cytometry were used to investigate the related intracellular signals and molecule expression.
Results:
The arginase mRNA and protein levels in freshly isolated primary mouse macrophages under simulated microgravity using RCCS-1 were significantly higher than those under normal gravity. Meanwhile, simulated microgravity induced over-expression of C/EBPβ, a transcription factor of arginase promoter, and activation of p38 MAPK, which could increase C/EBPβ expression. Furthermore, up-regulation of Interleukin-6 (IL-6) and down-regulation of IL-12 p40 (IL-12B) in LPS-stimulated macrophages were also detected after simulated microgravity, which is regulated by C/EBPβ.
Conclusions:
Simulated microgravity activates a p38 MAPK-C/EBPβ pathway in macrophages to up-regulate arginase and IL-6 expression and down-regulate IL-12B expression. Both increased arginase expression and decreased IL-12B expression in macrophages during inflammation could result in immunosuppression under microgravity.
Insights
Simulated microgravity increases arginase and IL-6 while decreasing IL-12B in macrophages via the p38 MAPK-C/EBPβ pathway, contributing to immune suppression.
Area of Science:
- Immunology
- Space Biology
- Cellular Biology
Background:
- Microgravity's impact on immune function is not fully understood.
- Macrophages play a critical role in immune responses.
- Investigating cellular mechanisms is key to understanding spaceflight effects.
Purpose of the Study:
- To explore simulated microgravity's effects on macrophage function.
- To identify intracellular signaling pathways involved.
Main Methods:
- Primary mouse macrophages cultured under simulated microgravity (RCCS-1) and 1g control.
- Gene expression and protein levels analyzed using real-time PCR and western blots.
- Flow cytometry used to assess cellular functions and signaling.
Main Results:
- Simulated microgravity significantly increased arginase mRNA and protein levels.
- Over-expression of C/EBPβ and activation of p38 MAPK were observed.
- Interleukin-6 (IL-6) was upregulated, and IL-12 p40 (IL-12B) was downregulated.
Conclusions:
- A p38 MAPK-C/EBPβ pathway is activated by simulated microgravity in macrophages.
- This pathway modulates arginase, IL-6, and IL-12B expression.
- Altered macrophage function under microgravity may lead to immunosuppression.
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