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Activation of the FAK/PI3K pathway is crucial for AURKA-induced epithelial-mesenchymal transition in laryngeal cancer

Oncol Rep. 2016 Aug;36(2):819-26. doi: 10.3892/or.2016.4872. Epub 2016 Jun 13.

Abstract

Laryngeal squamous cell carcinoma (LSCC) is one of the most common malignant tumors, and the main cause of death is metastasis. Overexpression of aurora kinase A (AURKA) plays an important role in the metastasis of LSCC. However, the mechanism by which AURKA promotes the metastasis of LSCC is poorly understood. Recent accumulating evidence indicates that epithelial-mesenchymal transition (EMT) may be one of the mechanisms of tumor metastasis. In the present study, we studied whether AURKA may induce EMT to promote the metastasis of LSCC. CCK-8 and plate colony-formation assays were carried out to show that AURKA significantly promoted the proliferation of Hep2 cells. Immunofluorescence staining and western blotting showed that EMT-related proteins changed in a time-dependent manner along with the alteration of AURKA, with decreased expression of N-cadherin, vimentin and slug and increased expression of E-cadherin. Additionally, downregulation of the expression of AURKA inhibited FAK/PI3K pathway activity. Inhibition of the FAK/PI3K pathway caused less mesenchymal-like characteristics and reduced the mobility, migration and invasion of Hep2 cells. In conclusion, AURKA may induce EMT to promote metastasis via activation of the FAK/PI3K pathway in LSCC. Those regulatory factors may present new diagnostic biomarkers and potential therapeutic targets for LSCC.

MeSH terms

  • Aurora Kinase A / genetics*
  • Cadherins / genetics
  • Carcinoma, Squamous Cell / genetics
  • Carcinoma, Squamous Cell / pathology
  • Cell Line, Tumor
  • Cell Movement / genetics
  • Cell Proliferation / genetics
  • Down-Regulation / genetics
  • Epithelial-Mesenchymal Transition / genetics*
  • Focal Adhesion Kinase 1 / genetics*
  • Gene Expression Regulation, Neoplastic / genetics
  • Head and Neck Neoplasms / genetics
  • Head and Neck Neoplasms / pathology
  • Humans
  • Laryngeal Neoplasms / genetics*
  • Laryngeal Neoplasms / pathology
  • Lymphatic Metastasis / genetics
  • Lymphatic Metastasis / pathology
  • Neoplasm Invasiveness / genetics
  • Neoplasm Invasiveness / pathology
  • Phosphatidylinositol 3-Kinases / genetics*
  • Signal Transduction / genetics
  • Sincalide / genetics
  • Snail Family Transcription Factors / genetics
  • Squamous Cell Carcinoma of Head and Neck
  • Vimentin / genetics

Substances

  • Cadherins
  • SNAI1 protein, human
  • Snail Family Transcription Factors
  • Vimentin
  • Phosphatidylinositol 3-Kinases
  • Focal Adhesion Kinase 1
  • PTK2 protein, human
  • AURKA protein, human
  • Aurora Kinase A
  • Sincalide