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  • Title: Knockdown of β-Catenin through shRNA cause a reversal of EMT and metastatic phenotypes induced by HIF-1α.
    Author: Zhao JH, Luo Y, Jiang YG, He DL, Wu CT.
    Journal: Cancer Invest; 2011 Jul; 29(6):377-82. PubMed ID: 21649463.
    Abstract:
    OBJECTIVE: Wnt/β-catenin signaling pathway regulates pattern formation during embryogenesis as well as tumor progression. Numbers of studies suggest that this signaling pathway may play an important role in Epithelial-Mesenchymal transition (EMT), however, there was no evidence that Wnt/β-catenin signaling pathway directly controlled the EMT occurrence. Our previous research has successfully proved that overexpression of hypoxia inducible factor-1α (HIF-1α) could induce EMT in LNCaP cells, but not in PC-3. Consistently, the expression of β-catenin protein increased in LNCaP/HIF-1α cells, but not in PC-3/HIF-1α. This study mainly aimed at exploring the essentiality and importance of Wnt/β-catenin signaling pathway in HIF-1α-induced EMT. METHODS: Human prostate cancer cells (LNCaP) were stably transfected by recombinant plasmid pcDNA3.1(-)/HIF-1α. The positive clones were selected by G418 and confirmed through western blot analysis, reverse transcription-polymerase chain reaction (RT-PCR), and indirect immunofluoesence. Then LNCaP/HIF-1α was transiently transfected with β-catenin shRNA (shRNA1 and shRNA2) and negative shRNA (shRNA-scr). The epithelial markers, mesenchymal markers, and critical proteins in Wnt/β-catenin signaling pathway were separately detected by western blot analysis. Finally, the invasive potency of cells in different transfection group was examined by Matrgel transwell assay. RESULT: We successfully established prostate cancer cell line LNCaP/HIF-1α and LNCaP/HIF-1α/β-catenin(-). LNCaP/HIF-1α displayed high expression of mesenchymal markers and low expression of epithelial markers. However, compared with LNCaP/HIF-1α, the epithelial marker E-cadherin was increased in LNCaP/HIF-1α/β-catenin(-), whereas the expression of mesenchymal marker N-cadherin, vimentin, MMP-2 were significantly decreased. Inhibition of Wnt signal activity through β-catenin shRNA cause a reversal of EMT induced by HIF-1α in human prostate cancer. CONCLUSION: Overexpression of HIF-1α stimulates the invasion potency of human prostate carcinoma cells through EMT pathway and Wnt/β-catenin signaling pathway played a vital role in this process. Wnt/β-catenin signaling pathway might be a necessary endogenous signal that directly controlled the EMT occurrence induced by HIF-1α.
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