MicroRNA-27a Inhibits Cell Migration and Invasion of Fibroblast-Like Synoviocytes by Targeting Follistatin-Like...

Area of Science:

• Immunology
• Molecular Biology
• Rheumatology

Background:

• Aberrant microRNA (miRNA) expression in fibroblast-like synoviocytes (FLS) is key in rheumatoid arthritis (RA) pathogenesis.
• miRNA modulation shows therapeutic potential in arthritis models.
• The specific role of miR-27a in RA-FLS remains to be fully elucidated.

Purpose of the Study:

• To investigate the function of miR-27a in the migration and invasion of FLS from RA patients.
• To identify the molecular targets and pathways regulated by miR-27a in RA.

Main Methods:

• Quantitative reverse transcription-PCR and Western blot analysis were used to assess gene and protein expression.
• Transwell assays were employed to evaluate FLS migration and invasion.
• Luciferase reporter assays validated the direct targeting of FSTL1 by miR-27a.

Main Results:

• miR-27a was significantly downregulated in RA patients' serum, synovial tissue, and FLS.
• Overexpression of follistatin-like protein 1 (FSTL1) was observed in RA.
• miR-27a suppressed RA-FLS migration and invasion, downregulated matrix metalloproteinases (MMP2, MMP9, MMP13) and Rho family proteins (Rac1, Cdc42, RhoA).
• miR-27a directly targeted FSTL1, reducing its expression and subsequently inhibiting the TLR4/NFκB signaling pathway.

Conclusions:

• miR-27a acts as a tumor suppressor in RA by inhibiting FLS migration and invasion.
• Targeting FSTL1 and the TLR4/NFκB pathway is a mechanism by which miR-27a exerts its anti-rheumatic effects.
• miR-27a represents a potential therapeutic target for rheumatoid arthritis.