Journal of Internal Medicine Concepts & Practice ›› 2026, Vol. 20 ›› Issue (06): 449-456.doi: 10.16138/j.1673-6087.2025.06.04

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SOX9 promotes proliferation of fibroblast-like synoviocytes in rheumatoid arthritis by inhibiting miR-204/-211

YANG Yilei1(), LIU Jing1, FAN Kaijian2, WANG Tingyu1,*()   

  1. 1. Department of Pharmacy, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, China
    2. Department of Pharmacy, Chongming District Mental Health Center, Shanghai 202150, China
  • Received:2024-11-06 Online:2026-01-27 Published:2026-01-30

Abstract:

Objective To investigate the effect of sex determining region Y-box transcription factor 9 (SOX9) on the function of fibroblast-like synoviocyte (FLS) in rheumatoid arthritis (RA) by inhibiting micro-ribonucleic acid (miRNA)-204 and -211, and to explore the underlying mechanism. Methods A collagene-induced arthritis (CIA) model was established by type Ⅱ collagen induction. FLS were isolated from the knee joint synovial tissue of CIA mice by digestion with type Ⅳ collagenase. The expression level of Sox9 in FLS was detected by quantitative real-time polymerase chain reaction (qPCR). Small interfering ribonucleic acid (siRNA) was used to inhibit Sox9 expression, and cell proliferation was assessed by CCK-8 assay and 5-ethynyl-2’-deoxyuridine (EdU) staining. Cell senescence was analyzed by senescence-associated β-galactosidase (SA-β-gal) staining, and the expression of cyclin-dependent kinase inhibitor (CKI) p16, p21, p53 and miR-204, miR-211 was detected by qPCR. The HDOCK online server (http://hdock.phys.hust.edu.cn/) was used to analyze the binding potential between miR-204/miR-211 and SOX9. Results Compared with FLS from normal mice, the messenger ribonucleic acid (mRNA) level of SOX9 was significantly increased in CIA-FLS. Knock down of Sox9 can promote cell senescence, thereby inhibiting FLS proliferation. Both miR-204 and miR-211 could stably bind to SOX9. Knockdown of Sox9 in CIA-FLS can increase the expression of miR-204/-211. Conclusions SOX9 can promote the proliferation of CIA-FLS and inhibit their senescence by down-regulating the expression of miR-204 and miR-211.

Key words: SOX9, miR-204/-211, Fibroblast-like synoviocyte

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