VGLL3 and rheumatoid arthritis: The results showed that overexpression of VGLL3 markedly increased the protein level of IRF3 in the nuclei of RA-FLS (Fig. 4B), and the phosphorylation of IRF3 in RA-FLS was also enhanced by overexpression of VGLL3 as shown by Western blotting (Fig. 4C).