RESUMO
Purpose To identify the binding of hypoxia in-ducible factor-2a (HIF-2 a) to the hypoxia-response element(HRE) of the matrixmetallo proteinases-2 (MMP-2) gene promoter region and clear the binding site. Methods Electro-phoretic mobility shift assay (EMSA) was used to identify the binding of HIF-2 a to HRE of the MMP-2 gene promoter region in vitro. At the same time, the chromatin immunoprecipitation assay (CHIP) was used to further determine the binding site. Results Successful prediction of two potential HIF-2a binding sites of MMP-2 the promoter region, which were-217～-204 and-1 029 ～-1 007, respectively. Probe test shows that the marked efficiency of sense chain and antisense chain was above 50％, and they could be used for EMSA-electrophoretic mobility shift assay. The results of EMSA showed that there was a binding site of HIF-2 a sense chain and antisense chain moter region int-217～-204. The results of chromatin immuno-precipitation showed that in the experimental group and control group an about 250 bp fragment in MMP-2 promoter containing HRE region was amplified, suggesting that the protein of HIF-2a binded to the HRE in MMP-2 promoter region in vivo. Conclusion HIF-2 a in MMP-2 promoter regionne promoter region in vitro and in vivo.