MEFs were cultured with or without PMA in serum-starved condition overnight. Flnb+/+ and Flnb−/− tumor tissues were homogenized and immunoblotted as described earlier,10 (link) followed by incubation with primary antibody against FLNB (Chemicon International, Inc., Temecula, CA, USA), FLNA (EMD Millipore), Actin (Sigma Aldrich), phosphorylated ERK1/2, total ERK1/2, phosphorylated-PKC-α/β and phosphorylated-PKC-δ/θ (Cell Signaling Technologies, Danvers, MA, USA) and MMP-9 (Nordic BioSite, Taby, Sweden). Membranes were then incubated with an appropriate anti-mouse or anti-rabbit IgG-horseradish peroxide conjugated secondary antibody (Amersham Biosciences, Amersham, UK) and the proteins were visualized by using enhanced chemiluminescence (Amersham Biosciences). The densities of bands were quantified by ImageQuant software (Bio-Rad, Hercules, CA, USA). Actin was used as an internal loading control.