Resveratrol inhibits matrix metalloproteinase-9 transcription in U937 cells.

AIM: To examine the inhibitory effect of resveratrol on matrix metalloroteinase-9 (MMP-9) and explore its mechanism. METHODS: MMP-9 activity was analyzed by gelatin zymography; MMP-9 protein was detected by Western blot; MMP-9 mRNA expression was investigated by RT-PCR. Activation of activator protein -1 (AP-1) was measured by electrophoretic mobility shift assay (EMSA). RESULTS: MMP-9 activity in U937 cells increased significantly after exposed to PMA at 10 nmol/L for 24 h without FCS (P<0.01). Resveratrol at 1 and 10 micromol/L showed significant inhibition on MMP-9 activity (P<0.05 and P<0.01, respectively). Western blot and RT-PCR experiments displayed that MMP-9 protein (P<0.01) and mRNA expression (P<0.01) increased significantly in PMA-treated U937 cells. Resveratrol at 1 and 10 micromol/L showed inhibitory effects on MMP-9 protein production and MMP-9 mRNA expression (P<0.05). The activation of AP-1 induced by PMA was also extensively inhibited by resveratrol at 0.1, 1, and 10 micromol/L. CONCLUSION: The inhibitory effect of resveratrol on MMP-9 activity may be partly through suppression of activation of nuclear transcription factor AP-1, and inhibition of MMP-9 mRNA expression and MMP-9 protein production.