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Updated: Jun 3, 2026
Metabolic Characterization of Polarized M1 and M2 Bone Marrow-derived Macrophages Using Real-time Extracellular Flux Analysis
Published on: November 28, 2015
Wavelength-Dependent Photobiomodulation Regulates Macrophage Polarization via Mitochondrial Dynamics and Metabolic
Qiusheng Shi1, Hao Jia1, Jianfei Dong2
1Key Laboratory of Biomechanics and Mechanobiology (Beihang University), Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, China.
Specific light wavelengths control macrophage behavior by altering metabolism and mitochondrial dynamics. This discovery offers a foundation for precise photobiomodulation (PBM) therapies targeting immune responses and wound healing.
Area of Science:
- Immunology
- Metabolic pathways
- Mitochondrial dynamics
Background:
- Photobiomodulation (PBM) offers non-invasive immune regulation but lacks mechanistic understanding linking light parameters to outcomes.
- Clinical translation of PBM is limited by the absence of clear connections between specific light wavelengths and biological responses.
Purpose of the Study:
- To elucidate the mechanistic links between specific light wavelengths and macrophage polarization.
- To establish a wavelength-dependent framework for photobiomodulation in regulating immune cell metabolism and function.
Main Methods:
- Investigated the effects of 850-nm and 625-nm light on macrophage polarization in vitro and in vivo wound healing models.
- Analyzed immunometabolic pathways, including fatty acid oxidation and glycolysis, and mitochondrial dynamics (fusion/fission).
- Utilized metabolic interventions to confirm causality between wavelength-specific effects and macrophage polarization outcomes.
Main Results:
- 850-nm light promoted M2 anti-inflammatory macrophage polarization via enhanced fatty acid oxidation and mitochondrial fusion, accelerating wound repair.
- 625-nm light induced M1 pro-inflammatory macrophage polarization through increased glycolytic flux and mitochondrial fission, delaying healing.
- Mitochondrial dynamics were identified as the critical interface mediating wavelength-specific metabolic routing and macrophage fate.
Conclusions:
- Specific wavelengths of light act as metabolic switches, directing macrophage polarization through distinct immunometabolic pathways.
- The findings define photo-immunometabolism as a wavelength-dependent process controlled by mitochondrial dynamics, providing a basis for precision PBM therapies.
- This research offers a mechanistic framework for developing tailored PBM treatments for wound repair and inflammatory disorders.
