Objective To study the function and mechanism of G protein coupled receptor kinase interacting protein 1(GIT1) RNA hairpin (GIT1-RNAh) in osteoblast migration. Methods The sixth passage osteoblasts were divided into 2 groups and were infected by GIT1-RNAh (experimental group) and green fluoresence protein RNA hairpin (GFP-RNAh) (control group) adenovirus for 12 hours respectively. Each group was further classfied into two groups according to with or without platelet-drived growth factor (PDGF) stimulation. The GIT1 expression and Paxillindistribution was analyzed by immunofluorescence staining. Paxillin phosphorylation was detected by Western Blot. The localization of Paxillin was determined by co-immunofluorescence staining after transfection with cyanine fluorescence protein tagged GIT1RNAh (CFP-GIT1-RNAh)(experimental group) and GFP-RNAh (CFP-GFP-RNAh)(control group). The role of GIT1-RNAh (experimental group) and GFP-RNAh (control group) adenovirus in osteoblasts migration was determined by wound healing assay. Results Immunofluorescence staining results showed that the GIT1-RNAh significantly inhibited endogenous GIT1 expression, interfered Paxillin distribution.Western Blot results showed that Paxillin phosporylation was obviously inhibited in osteoblasts infected with GIT1-RNAh adenovirus (P＜0.05). The wound healing assay results howed that GIT1-RNAh adenovirus significantly inhibited osteoblast migration induced by PDGF. Conclusion GIT1-RNAh inhibits osteoblasts migration by interfering paxillin distribution and decrease Paxillin phosphorylation.

Citation： ZHANG Ning,HU Zhiyi,YIN Guoyong,et al.. MECHANISM OF G PROTEIN COUPLED RECEPTOR KINASE INTERACTING PROTEIN 1 RNA HAIRPIN INHIBITING OSTEOBLASTS MIGRATION. Chinese Journal of Reparative and Reconstructive Surgery, 2007, 21(1): 1-5. doi: Copy