Fig. 2

Light optical microscope and immunofluorescence staining of vimentin pictures of synoviocytes (a). VIP expression in OA-synoviocytes during culture for 14 days (b), culture for 2 days in 4 groups (c). VIP plasmid inhibits the proliferation of synoviocytes (d). *P < 0.05, **P < 0.01, ***P < 0.001, and n.s means no statistical difference