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Updated: May 17, 2026

RNA-seq Analysis of Transcriptomes in Thrombin-treated and Control Human Pulmonary Microvascular Endothelial Cells
Published on: February 13, 2013
Thrombin-induced CCN2 expression in human lung fibroblasts requires the c-Src/JAK2/STAT3 pathway
Kua-Jen Bai1, Bing-Chang Chen, Hui-Chen Pai
1College of Medicine, Taipei Medical University, 250 Wu-Hsing St., Taipei, Taiwan.
Thrombin activates c-Src, JAK2, and STAT3 signaling pathways to induce CCN2 expression in lung fibroblasts. This study elucidates a novel signaling cascade linking thrombin to fibrotic mediator CCN2 production.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Thrombin is a serine protease and a key mediator of fibrosis.
- Previous research identified an ASK1-dependent JNK/AP-1 pathway in thrombin-induced CCN2 expression.
- The roles of c-Src, JAK2, and STAT3 in this process remained to be elucidated.
Purpose of the Study:
- To investigate the involvement of c-Src, JAK2, and STAT3 in thrombin-induced CCN2 expression in human lung fibroblasts.
- To delineate the signaling pathway downstream of thrombin leading to CCN2 upregulation.
Main Methods:
- Utilized JAK inhibitor (AG490), dominant-negative constructs (JAK2DN, STAT3DN, c-SrcDN), and STAT decoy oligonucleotides.
- Assessed CCN2 expression and CCN2-Luc reporter activity.
- Analyzed protein phosphorylation (JAK2, STAT3) and DNA-binding using pull-down assays.
Main Results:
- Thrombin-induced CCN2 expression and reporter activity were significantly reduced by inhibitors and dominant-negative constructs targeting JAK2, STAT3, and c-Src.
- Thrombin treatment led to time-dependent phosphorylation of JAK2 and STAT3.
- c-Src activation preceded JAK2 and STAT3 phosphorylation, suggesting a sequential activation cascade.
Conclusions:
- Thrombin activates CCN2 expression in human lung fibroblasts through a signaling pathway involving sequential activation of c-Src, JAK2, and STAT3.
- This pathway represents a potential therapeutic target for fibrotic diseases mediated by CCN2.
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