TNF and rheumatoid arthritis: In RA-FLS transfected with miR-124a inhibitor, the average OD450 was 0.735±0.041 and the average TNF-α concentration was 423.78 ± 43.12 ng/L, which was significantly higher than those in FLS transfected with scrambled control (OD450 was 0.622 ± 0.029 and TNF-α concentration was 356.25 ± 50.82 ng/L, p = 0.001 and 0.011, respectively).