MicroRNA-99b suppresses human cervical cancer cell activity by inhibiting the PI3K/AKT/mTOR signaling pathway

J Cell Physiol. 2019 Jun;234(6):9577-9591. doi: 10.1002/jcp.27645. Epub 2018 Nov 27.


Cervical cancer is common cancer among women with high morbidity. MicroRNAs (miRs) are involved in the progression and development of cervical cancer. This study aimed to explore the effect of miR-99b-5p (miR-99b) on invasion and migration in cervical cancer through the phosphatidylinositol 3-kinase (PI3K)/protein kinase B (AKT)/mechanistic target of rapamycin (mTOR) signaling pathway. The microarray-based analysis was used to screen out differentially expressed miRNAs. Expression of miR-99b, PI3K, AKT, mTOR, and ribosomal protein S6 kinase (p70S6K) was determined in both cervical cancer tissues and paracancerous tissues. Next, alteration of miR-99b expression in cervical cancer was conducted to evaluate levels of PI3K, AKT, mTOR, p70S6K matrix metallopeptidase 2, epithelial cell adhesion molecule, and intercellular adhesion molecule 1, as well as the effect of miR-99b on cell proliferation, invasion, migration, cell cycle distribution, and apoptosis. The results demonstrated that miR-99b expression was decreased and levels of PI3K, AKT, mTOR, and p70S6K were elevated in cervical cancer tissues. More important, overexpressed miR-99b repressed the PI3K/AKT/mTOR signaling pathway, inhibited cell proliferation, invasion, and migration, blocked cell cycle entry, and promoted apoptosis in cervical cancer. These results indicate that miR-99b attenuates the migration and invasion of human cervical cancer cells through downregulation of the PI3K/AKT/mTOR signaling pathway, which provides a therapeutic approach for cervical cancer treatment.

Keywords: PI3K/AKT/mTOR; cell invasion; cell migration; cervical cancer; microRNA-99b; signaling pathway.

Publication types

  • Retracted Publication

MeSH terms

  • Adult
  • Aged
  • Apoptosis / genetics
  • Base Sequence
  • Cell Cycle
  • Cell Line, Tumor
  • Cell Movement / genetics
  • Cell Proliferation / genetics
  • Down-Regulation / genetics
  • Female
  • Gene Expression Regulation, Neoplastic
  • Humans
  • MicroRNAs / genetics
  • MicroRNAs / metabolism*
  • Middle Aged
  • Neoplasm Invasiveness
  • Phosphatidylinositol 3-Kinases / metabolism*
  • Proto-Oncogene Proteins c-akt / metabolism*
  • RNA, Messenger / genetics
  • RNA, Messenger / metabolism
  • Ribosomal Protein S6 Kinases, 70-kDa / metabolism
  • Signal Transduction*
  • TOR Serine-Threonine Kinases / metabolism*
  • Up-Regulation / genetics
  • Uterine Cervical Neoplasms / genetics*
  • Uterine Cervical Neoplasms / pathology*


  • MIRN99 microRNA, human
  • MicroRNAs
  • RNA, Messenger
  • Proto-Oncogene Proteins c-akt
  • Ribosomal Protein S6 Kinases, 70-kDa
  • TOR Serine-Threonine Kinases