WWTR1 and rheumatoid arthritis: Furthermore, WWTR1 siRNA transfection could also restore the nuclear translocation of IRF3 and the expression of STAT1 which were inhibited by VGLL3 silencing in RA-FLS (Fig. 5E, F), suggesting that VGLL3 regulates the IRF3 nuclear translocation and IFN-β1 expression through the Hippo pathway.