Recruitment of HIF-1 to the promoter of <i>TSP-1</i> gene.

<p>A) Results show a representative chromatin immunoprecipitation (ChIP) experiment performed in samples from U937-derived macrophages in normoxia or hypoxia. Chromatin was immunoprecipitated with anti-HIF-1α antibody, or a non-related antibody anti-IgG as a control. An aliquot of the input chromatin is also shown. Primers specific to the promoter region for TSP-1 gene were used to amplify the DNA isolated from the ChIP assay. B) HIF-1α expression in nuclear lysates derived from non-transfected cells and from <i>miHIF1α</i> or mock-transfected U937cells exposed to normoxia or hypoxia. Interactions between HIF-1α and HRE of the TSP-1 promoter gene were examined by EMSA using synthetic oligonucleotides and nuclear lysates derived from transfected or non-transfected cells exposed to normoxia or hypoxia. Specificity was determined with excess unlabelled probed (XS) or mutated probe (n = 3).