miR-2861 acts as a tumor suppressor via targeting EGFR/AKT2/CCND1 pathway in cervical cancer induced by human papillomavirus virus 16 E6

Sci Rep. 2016 Jul 1:6:28968. doi: 10.1038/srep28968.

Abstract

Persistent infection with oncogenic human papillomavirus viruses (HPVs) is a casual factor for cervical cancer and its precursors, and the abnormal constitutive expression of viral oncoprotein E6 is a key event during the malignant transformation. Here, we performed miRNA microarray to identify changes of miRNAs following ectopic HPV16 E6 overexpression in HEK293T cells and found miR-2861 was greatly decreased in both HEK293T and HaCaT cells expressing HPV16 E6 compared to vector control. Further, we demonstrated a biological link among HPV16 E6, miR-2861, EGFR, AKT2, and CCND1 in cervical cancer cells. We showed that miR-2861 was downregulated in cervical cancer tissues and negatively correlated with advanced tumor stage and lymph node metastasis. Overexpression of miR-2861 suppressed cervical cancer cell proliferation and invasion and enhanced apoptosis. Subsequent investigation revealed that EGFR, AKT2, and CCND1 were all the direct targets of miR-2861. Importantly, silencing EGFR, AKT2, and/or CCND1 recapitulated the cellular effects seen upon miR-2861 overexpression. Restoration of EGFR, AKT2, and/or CCND1 counteracted the effects of miR-2861 expression. Thus, we identified a new pathway employing miR-2861, EGFR, AKT2, and CCND1 that may mediate HPV16 E6 induced initiation and progression of cervical cancer.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Cell Line, Tumor
  • Cell Transformation, Viral / genetics*
  • Cyclin D1 / genetics
  • ErbB Receptors / genetics
  • Female
  • Gene Expression Regulation, Neoplastic
  • HEK293 Cells
  • Human papillomavirus 16 / metabolism*
  • Humans
  • MicroRNAs / genetics*
  • Neoplasm Metastasis
  • Neoplasm Staging
  • Oligonucleotide Array Sequence Analysis
  • Oncogene Proteins, Viral / genetics*
  • Oncogene Proteins, Viral / metabolism
  • Papillomavirus Infections / genetics*
  • Papillomavirus Infections / metabolism
  • Papillomavirus Infections / pathology
  • Proto-Oncogene Proteins c-akt / genetics
  • Repressor Proteins / genetics*
  • Repressor Proteins / metabolism
  • Signal Transduction*
  • Uterine Cervical Neoplasms / genetics
  • Uterine Cervical Neoplasms / metabolism
  • Uterine Cervical Neoplasms / microbiology*
  • Uterine Cervical Neoplasms / pathology

Substances

  • CCND1 protein, human
  • E6 protein, Human papillomavirus type 16
  • MIRN2861 microRNA, human
  • MicroRNAs
  • Oncogene Proteins, Viral
  • Repressor Proteins
  • Cyclin D1
  • EGFR protein, human
  • ErbB Receptors
  • AKT2 protein, human
  • Proto-Oncogene Proteins c-akt