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Updated: Sep 2, 2025
Investigation of Macrophage Polarization Using Bone Marrow Derived Macrophages
Published on: June 23, 2013
SENP1-KLF4 signalling regulates LPS-induced macrophage M1 polarization
Kezhou Wang1, Jie Xiong2, Yiwen Lu3
1Department of Pathology, Xinhua Hospital, Affiliated to Medicine School of Shanghai Jiaotong University, Shanghai, China.
Abstract:
Macrophages are very important immune cells and play critical roles in tumour immunity. Macrophage subtypes can be divided into classical polarization (M1 macrophages) and alternative polarization (M2 macrophages) under different microenvironments. Krüppel-like factor 4 (KLF4) is an essential transcription factor for macrophage polarization. Our previous study has shown that KLF4 SUMOylation plays an important role in macrophage M2 polarization. In the present study, small ubiquitin-like modifier (SUMO) specific peptidase (SENP)1 was identified as a specific protease for KLF4 de-SUMOylation, with the SENP1-KLF4 axis playing a vital role in M1 macrophage polarization by affecting the nuclear factor kappa B signalling pathway. Additionally, the activity of tumour cells was weakened by KLF4 SUMOylation deficient macrophages. Hence, the SENP1-KLF4 axis is considered to play a crucial role in regulating lipopolysaccharide-induced macrophage M1 polarization, thereby affecting the activity of tumour cells. Therefore, the SENP1-KLF4 axis has therapeutic potential as a target in cancer therapy.
Insights
The SENP1-KLF4 axis is crucial for M1 macrophage polarization, impacting tumor cell activity. This pathway offers potential as a cancer therapy target.
Area of Science:
- Immunology
- Molecular Biology
- Cancer Research
Background:
- Macrophages are key immune cells in tumor immunity, with M1 and M2 subtypes.
- Krüppel-like factor 4 (KLF4) is essential for macrophage polarization.
- KLF4 SUMOylation is important for M2 macrophage polarization.
Purpose of the Study:
- To identify proteases involved in KLF4 de-SUMOylation.
- To investigate the role of the SENP1-KLF4 axis in macrophage polarization and tumor immunity.
- To explore the therapeutic potential of targeting the SENP1-KLF4 axis in cancer.
Main Methods:
- Identification of small ubiquitin-like modifier (SUMO) specific peptidase (SENP)1 as a KLF4 de-SUMOylating protease.
- Analysis of the SENP1-KLF4 axis in lipopolysaccharide-induced M1 macrophage polarization.
- Assessment of the impact of KLF4 SUMOylation-deficient macrophages on tumor cell activity.
Main Results:
- SENP1 was identified as a specific protease for KLF4 de-SUMOylation.
- The SENP1-KLF4 axis plays a vital role in M1 macrophage polarization via the nuclear factor kappa B signaling pathway.
- KLF4 SUMOylation-deficient macrophages exhibited weakened tumor cell activity.
Conclusions:
- The SENP1-KLF4 axis is critical for regulating M1 macrophage polarization.
- This axis influences tumor cell activity, suggesting its role in cancer progression.
- Targeting the SENP1-KLF4 axis presents a potential therapeutic strategy for cancer treatment.
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