Abstract
Migration and invasion are important characteristics of rheumatoid arthritis fibroblast-like synoviocytes (RA-FLSs), which are involved in joint damage and contribute to rheumatoid arthritis (RA) pathology. However, the underlying mechanisms remain unclear. Because epithelial–mesenchymal transition (EMT) is a key mechanism related to migration and invasion in cancer cells, we investigated the relationship between EMT and RA-FLSs and explored whether the transforming growth factor β1 (TGF-β1)/Smad signaling pathway is involved. In vivo, fibroblast-like synoviocytes (FLSs) were isolated from the synovium of RA or osteoarthritis (OA) patients and cultured for 4–8 passages. EMT markers were detected by immunofluorescence and Western blotting. RA-FLSs were treated with TGF-β1 or Smad2/3 small interfering RNA (siRNA), EMT markers were detected, and migration and invasion were assessed by Transwell assays. EMT markers could be detected in FLSs; when compared with osteoarthritis fibroblast-like synoviocytes (OA-FLSs), E-cadherin and vimentin decreased, while N-cadherin and α-smooth muscle actin (α-SMA) increased in RA-FLSs. Furthermore, TGF-β1 enhanced migration and invasion by inducing EMT via activating Smad2/3 in RA-FLSs. Phosphorylation of Smad2/3 was accompanied by degradation of Smad3. Silencing Smad2/3 blocked EMT and inhibited the migration and invasion induced by TGF-β1. Matrix metalloproteinase 9 (MMP9) and vimentin were not affected when cells were treated with TGF-β1 or Smad2/3 siRNA. The TGF-β1/Smad signaling pathway is involved in EMT and contributes to migration and invasion in RA-FLSs. Interestingly, vimentin decreased in RA-FLSs, but there is no correlation between vimentin and TGF-β1/Smad signaling pathway. Thus, further research on vimentin should be conducted.
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Acknowledgements
The present study was supported by National Natural Science Foundation of China (Grant Nos. 81771747, 81801624) and Natural Science Foundation of Guangdong Province (Grant No. 2017A030313475).
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Zhu, D., Zhao, J., Lou, A. et al. Transforming growth factor β1 promotes fibroblast-like synoviocytes migration and invasion via TGF-β1/Smad signaling in rheumatoid arthritis. Mol Cell Biochem 459, 141–150 (2019). https://doi.org/10.1007/s11010-019-03557-0
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DOI: https://doi.org/10.1007/s11010-019-03557-0