Figure 6

p38 MAP kinase is not required for MMP-9 expression and stability of the kinase is not regulated by TNF-α. (A) HDFs transduced by lentivirus expressing GFP, PAK1 (K299R), p38 MAP kinase, and its dominant negative one were cultured on plastic or in 3D type-I collagen, followed by stimulation by cytokines. After 3 days, MMP-9 and -2 in the conditioned medium were measured by zymography. (B) Protein of p38MAP kinase was measured by Western blot analysis.