Induction of vascular endothelial growth factor by peptidyl-prolyl isomerase Pin1 in breast cancer cells.
Journal - Biochemical and biophysical research communications (United States )
Pin1, a peptidyl-prolyl isomerase, is overexpressed in most types of cancer tissues and plays an important role in oncogenesis. We found that Pin1 increases the transcriptional activity and protein level of vascular endothelial growth factor (VEGF) in the human breast cancer cell line, MCF-7. Reporter gene analyses showed that Pin1 overexpression increased the reporter activities in cells transfected with reporters containing the VEGF gene promoter or with minimal reporters of activator protein-1 (AP-1) and hypoxia response element (HRE). VEGF reporter gene activity was significantly inhibited by either hypoxia-inducible factor-alpha (HIF-1alpha) siRNA or AP-1 decoy ODN. Moreover, the reporter activities of the VEGF promoter, AP-1 and HRE in Pin1-/- mouse embryonic fibroblast (MEF) cells were decreased compared with those in wild-type Pin1 MEF cells. These results imply that Pin1 stimulates VEGF expression by activating HIF-1alpha and AP-1, and suggest that Pin1 is a potential therapeutic target of angiogenesis during cancer development.
|ISSN : ||1090-2104|
|Mesh Heading : ||Breast Neoplasms Cell Line, Tumor Humans Hypoxia-Inducible Factor 1, alpha Subunit Peptidylprolyl Isomerase Signal Transduction Transcription Factor AP-1 Vascular Endothelial Growth Factor A|
|Mesh Heading Relevant : ||metabolism metabolism metabolism metabolism metabolism|