Blockade of Axl signaling ameliorates HPV16E6-mediated tumorigenecity of cervical cancer

Sci Rep. 2017 Jul 18;7(1):5759. doi: 10.1038/s41598-017-05977-8.

Abstract

Axl receptor tyrosine kinase is involved in the tumorigenesis and metastasis of many cancers. Axl expression was markedly higher in human papilloma virus type 16E6 (HPV16E6)-overexpressing HeLa (HE6F) cells and lower in HPV16E6-suppressing CaSki (CE6R) cells than in the controls. SiRNA-mediated knockdown of E6 expression led to increased phosphatase and tensin homolog (PTEN) phosphorylation at Ser380 and attenuated AKT phosphorylation. Expression of membrane-associated guanylate kinase inverted-2 (MAGI-2), an E6-induced degradation target, was induced in E6-siRNA-transfected cells. Moreover, myeloid zinc finger protein 1 (MZF1) binds directly to the Axl promoter in HE6F cells. Axl expression was regulated by HPV16E6-mediated PTEN/AKT signalling pathway, and Axl promoter activity was regulated through MZF1 activation in cervical cancer, which promoted malignancy. Axl silencing suppressed the metastasis of Caski cells and enhanced the susceptibility to NK cell-mediated killing of HE6F cells. In addition, the expression of Axl and MZF1 was highly correlated with clinical stage of cervical cancer and HPV16/18 infection. Taken together, Axl expression was induced by HPV16E6 in cervical cancer cells, suggesting that blockade of Axl signalling might be an effective way to reduce the progression of cervical cancer.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Axl Receptor Tyrosine Kinase
  • Carcinogenesis / genetics
  • Carcinogenesis / metabolism*
  • Cell Line, Tumor
  • Female
  • Gene Expression Regulation, Neoplastic
  • HEK293 Cells
  • HeLa Cells
  • Human papillomavirus 16 / genetics
  • Human papillomavirus 16 / metabolism
  • Humans
  • Kruppel-Like Transcription Factors / genetics
  • Kruppel-Like Transcription Factors / metabolism
  • Oncogene Proteins, Viral / genetics
  • Oncogene Proteins, Viral / metabolism*
  • Promoter Regions, Genetic / genetics
  • Protein Binding
  • Proto-Oncogene Proteins / genetics
  • Proto-Oncogene Proteins / metabolism*
  • RNA Interference
  • Receptor Protein-Tyrosine Kinases / genetics
  • Receptor Protein-Tyrosine Kinases / metabolism*
  • Repressor Proteins / genetics
  • Repressor Proteins / metabolism*
  • Signal Transduction / genetics
  • Uterine Cervical Neoplasms / genetics
  • Uterine Cervical Neoplasms / metabolism*
  • Uterine Cervical Neoplasms / pathology

Substances

  • E6 protein, Human papillomavirus type 16
  • Kruppel-Like Transcription Factors
  • MZF1 protein, human
  • Oncogene Proteins, Viral
  • Proto-Oncogene Proteins
  • Repressor Proteins
  • Receptor Protein-Tyrosine Kinases
  • Axl Receptor Tyrosine Kinase