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已发表论文
SCAP/SREBP2 介导的胆固醇生物合成途径抑制颗粒物诱导的巨噬细胞活化和气道炎症
Authors Chen WS , Lou JF, Li JY, Wu YP, Gao SW, Zheng K, Huang JQ, Li M, Zhu C, Zhang SY, Chen ZH , Wu YF, Li W
Received 3 April 2025
Accepted for publication 10 October 2025
Published 29 October 2025 Volume 2025:18 Pages 15117—15133
DOI https://doi.org/10.2147/JIR.S527083
Checked for plagiarism Yes
Review by Single anonymous peer review
Peer reviewer comments 3
Editor who approved publication: Prof. Dr. Yuhan Xing
Wei-Song Chen,1,2,* Jia-Fei Lou,1,* Jie-Yu Li,1 Yan-Ping Wu,1 Shen-Wei Gao,1 Kua Zheng,1 Jia-Qi Huang,1 Miao Li,1 Chen Zhu,1 Shu-Yang Zhang,3 Zhi-Hua Chen,1 Yin-Fang Wu,1 Wen Li1
1Key Laboratory of Respiratory Disease of Zhejiang Province, Department of Respiratory and Critical Care Medicine, Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, Zhejiang, People’s Republic of China; 2Department of respiratory medicine, Affiliated Jinhua Hospital Zhejiang University School of Medicine, Jinhua, Zhejiang, People’s Republic of China; 3The First Clinical Medical College, Wenzhou Medical University, Wenzhou, Zhejiang, People’s Republic of China
*These authors contributed equally to this work
Correspondence: Wen Li, Email liwen@zju.edu.cn Yin-Fang Wu, Email yinfangwu@zju.edu.cn
Objective: To investigate the role and mechanism of the SREBP cleavage activating protein/Sterol-regulatory element binding proteins 2(SCAP/SREBP2)-mediated cholesterol synthesis pathway in particulate matter (PM)-induced airway inflammation in macrophages.
Methods: Bone marrow-derived macrophages (BMDMs) were cultured in vitro, and after intervention with PM, the macrophage phagocytic activity and expression of related inflammatory factors were assessed. RNA sequencing (RNA-seq) was performed on BMDMs before and after PM exposure to identify significantly altered pathways. The change of these pathways was validated. In vitro, the SCAP/SREBP2-mediated cholesterol synthesis pathway in macrophages was inhibited using LysMCre-Scapf/f mice, inhibitors, and siRNAs, and the effects on PM-induced macrophage activation were detected. The specific mechanism was further explored. In vivo, PM-induced airway inflammation models were established using LysMCre-Scapf/f mice and their littermate controls (Scapf/f) to examine the role of the SCAP/SREBP2-mediated cholesterol synthesis pathway in PM-induced airway inflammation.
Results: Macrophages were able to phagocytose PM, which led to the expression of inflammatory factors. After phagocytosis of PM, the cholesterol levels in macrophages decreased, which in turn triggered the maturation of SREBP2 and activated the cholesterol synthesis pathway. Both LysMCre-Scapf/f mice and siRNA-mediated knockdown of SREBP2 exhibited an enhanced expression of inflammatory factors after PM exposure. Further studies revealed that inhibition of cholesterol biosynthesis also promoted the expression of inflammatory factors induced by PM, while cholesterol supplementation suppressed the PM-induced inflammatory response. Additionally, myeloid-specific knockout of SCAP exacerbated PM-induced airway inflammation and mucus secretion.
Conclusion: The SCAP/SREBP2-mediated cholesterol synthesis pathway inhibits macrophage activation and airway inflammation induced by PM through the production of cholesterol.
Keywords: SCAP, SREBP2, cholesterol, macrophage, PM
1Key Laboratory of Respiratory Disease of Zhejiang Province, Department of Respiratory and Critical Care Medicine, Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, Zhejiang, People’s Republic of China; 2Department of respiratory medicine, Affiliated Jinhua Hospital Zhejiang University School of Medicine, Jinhua, Zhejiang, People’s Republic of China; 3The First Clinical Medical College, Wenzhou Medical University, Wenzhou, Zhejiang, People’s Republic of China
*These authors contributed equally to this work
Correspondence: Wen Li, Email liwen@zju.edu.cn Yin-Fang Wu, Email yinfangwu@zju.edu.cn
Objective: To investigate the role and mechanism of the SREBP cleavage activating protein/Sterol-regulatory element binding proteins 2(SCAP/SREBP2)-mediated cholesterol synthesis pathway in particulate matter (PM)-induced airway inflammation in macrophages.
Methods: Bone marrow-derived macrophages (BMDMs) were cultured in vitro, and after intervention with PM, the macrophage phagocytic activity and expression of related inflammatory factors were assessed. RNA sequencing (RNA-seq) was performed on BMDMs before and after PM exposure to identify significantly altered pathways. The change of these pathways was validated. In vitro, the SCAP/SREBP2-mediated cholesterol synthesis pathway in macrophages was inhibited using LysMCre-Scapf/f mice, inhibitors, and siRNAs, and the effects on PM-induced macrophage activation were detected. The specific mechanism was further explored. In vivo, PM-induced airway inflammation models were established using LysMCre-Scapf/f mice and their littermate controls (Scapf/f) to examine the role of the SCAP/SREBP2-mediated cholesterol synthesis pathway in PM-induced airway inflammation.
Results: Macrophages were able to phagocytose PM, which led to the expression of inflammatory factors. After phagocytosis of PM, the cholesterol levels in macrophages decreased, which in turn triggered the maturation of SREBP2 and activated the cholesterol synthesis pathway. Both LysMCre-Scapf/f mice and siRNA-mediated knockdown of SREBP2 exhibited an enhanced expression of inflammatory factors after PM exposure. Further studies revealed that inhibition of cholesterol biosynthesis also promoted the expression of inflammatory factors induced by PM, while cholesterol supplementation suppressed the PM-induced inflammatory response. Additionally, myeloid-specific knockout of SCAP exacerbated PM-induced airway inflammation and mucus secretion.
Conclusion: The SCAP/SREBP2-mediated cholesterol synthesis pathway inhibits macrophage activation and airway inflammation induced by PM through the production of cholesterol.
Keywords: SCAP, SREBP2, cholesterol, macrophage, PM