The TREM2 paradox in fibrosis: a unified mechanism for opposite outcomes across organs
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By
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Xiuping Liang
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Yanhong Li
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Ziyi Tang
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Guan Wang
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Yi Liu
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June 16, 2026
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Objective:
To explore the dual role of TREM2 in fibrosis across different organs and its implications for macrophage polarization and fibrosis progression.
Approach:
Key Findings:
- TREM2 regulates inflammation and tissue repair, acting as an 'inflammatory brake' in macrophages.
- The role of TREM2 in fibrosis varies by organ; it can have effects in the liver but may promote fibrosis in the lungs.
- TREM2 influences macrophage functional polarization, immunometabolic reprogramming, and multicellular communication in the fibrotic microenvironment.
Interpretation:
Limitations:
- The review is limited to studies published in English and may not encompass all relevant literature.
- Focus on recent studies may overlook earlier foundational research.
Conclusion: