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      Enhancement of vascular endothelial growth factor-mediated angiogenesis in tamoxifen-resistant breast cancer cells: role of Pin1 overexpression.

      Molecular cancer therapeutics

      metabolism, Antineoplastic Agents, Hormonal, genetics, Vascular Endothelial Growth Factor A, Transcription Factor AP-1, pharmacology, Tamoxifen, Peptidylprolyl Isomerase, Neovascularization, Pathologic, Hypoxia-Inducible Factor 1, alpha Subunit, Humans, Female, Drug Resistance, Neoplasm, Cell Line, Tumor, blood supply, Breast Neoplasms

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          Abstract

          Acquired resistance to tamoxifen (TAM) is a serious therapeutic problem in breast cancer patients. Here, we found that TAM-resistant MCF-7 cells (TAMR-MCF-7 cells) produced higher levels of vascular endothelial growth factor (VEGF) than control MCF-7 cells. Molecular analyses using reporter genes and Western blots supported the involvement of c-Jun/activator protein-1 and hypoxia-inducible factor 1alpha in enhanced VEGF transcription in TAMR-MCF-7 cells. Pin1, a peptidyl prolyl isomerase, was consistently overexpressed in TAMR-MCF-7 cells, and c-Jun/activator protein-1-dependent VEGF transcription in TAMR-MCF-7 cells was almost completely inhibited by Pin1 siRNA and by the Pin1 inhibitor juglone. Chick chorioallantoic membrane assays confirmed that the increased angiogenic intensity of TAMR-MCF-7 cells was significantly suppressed by Pin1 inhibition. These results show that Pin1 overexpression is closely associated with VEGF-mediated angiogenesis and suggest that Pin1 is a potential therapeutic target of excessive angiogenesis in TAM-resistant breast cancer cases.

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          Author and article information

          Journal
          10.1158/1535-7163.MCT-08-1061
          19671742

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