Oncogenic role of protein tyrosine kinase 7 in esophageal squamous cell carcinoma

Cancer Sci. 2013 Aug;104(8):1120-6. doi: 10.1111/cas.12194. Epub 2013 Jun 13.


Esophageal squamous cell carcinoma (ESCC) is a common subtype of esophageal cancer that is particularly prevalent in East Asian countries. Our previous expression profile analysis showed that the gene encoding protein tyrosine kinase 7 (PTK7) is upregulated in ESCC tissues. Here, we aimed to validate PTK7 as a prognostic factor and a candidate target for molecular treatment of ESCC. Both RT-PCR and Western blot analysis of tissues from ESCC patients revealed that PTK7 was significantly upregulated in tumor tissue samples of ESCC. Immunohistochemical staining of PTK7 showed that increased expression of PTK7 was inversely correlated with overall survival (P = 0.021). In vitro knockdown of PTK7 inhibited proliferation, survival, wound healing, and invasion of ESCC cells. In addition, PTK7 knockdown decreased phosphorylation of Akt, Erk, and focal adhesion kinase (FAK), important determinants of cell proliferation, survival, and migration. Therefore, our findings suggest that PTK7 has potential as a prognostic marker for ESCC and might also be a candidate for targeted therapy in the treatment of ESCC.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aged
  • Carcinoma, Squamous Cell / enzymology*
  • Carcinoma, Squamous Cell / genetics
  • Carcinoma, Squamous Cell / pathology
  • Cell Adhesion Molecules / genetics
  • Cell Adhesion Molecules / metabolism*
  • Cell Growth Processes / genetics
  • Cell Line, Tumor
  • Cell Movement / genetics
  • Cell Survival / genetics
  • Esophageal Neoplasms / enzymology*
  • Esophageal Neoplasms / genetics
  • Esophageal Neoplasms / pathology
  • Esophageal Squamous Cell Carcinoma
  • Female
  • Focal Adhesion Protein-Tyrosine Kinases / genetics
  • Focal Adhesion Protein-Tyrosine Kinases / metabolism
  • HEK293 Cells
  • Humans
  • MAP Kinase Signaling System
  • Male
  • Phosphorylation
  • Prognosis
  • Proto-Oncogene Proteins c-akt / genetics
  • Proto-Oncogene Proteins c-akt / metabolism
  • Receptor Protein-Tyrosine Kinases / genetics
  • Receptor Protein-Tyrosine Kinases / metabolism*
  • Up-Regulation


  • Cell Adhesion Molecules
  • PTK7 protein, human
  • Receptor Protein-Tyrosine Kinases
  • Focal Adhesion Protein-Tyrosine Kinases
  • Proto-Oncogene Proteins c-akt