SLC27A2 regulates miR-411 to affect chemo-resistance in ovarian cancer

Neoplasma. 2018 Nov 15;65(6):915-924. doi: 10.4149/neo_2018_180122N48. Epub 2018 Sep 4.

Abstract

Although platinum-based chemotherapies have long been used as standard treatment in ovarian cancer, cisplatin resistance is a major problem that restricts its use. Herein, we investigate the biological function of SLC27A2 and its underlying mechanisms in regulating chemo-resistance in ovarian cancer. The findings show that SLC27A2 down-regulation in primary ovarian cancer tissues correlates with chemo-resistance and poor patient survival in our patient cohort. Significantly, we demonstrate that up-regulation of SLC27A2 by lentivirus-mediated p-SLC27A2 sensitizes ovarian cancer cells to cisplatin in vitro and in vivo via apoptosis. Mechanistic investigation reveals that miR-411 is the most strikingly over-expressed gene in response to ectopic expression of SLC27A2, but under-expressed in recurrent ovarian cancer tissues. Lower miR-411 expression contributes to ovarian cancer chemo-resistance in vitro and in vivo. Furthermore, SLC27A2 directly binds specific sites in the miR-411 promoter region and promoter activity decreases after mutation of putative SLC27A2-binding sites. This indicates that SLC27A2 is required for the transcriptional induction of miR-411. The luciferase assays also confirm that miR-411 directly targets ABCG2 in ovarian cancer, and overall findings establish the SLC27A2-miR-411-ABCG2 pathway in the regulation of ovarian cancer chemo-resistance with potential therapeutic applications.

MeSH terms

  • ATP Binding Cassette Transporter, Subfamily G, Member 2 / genetics
  • Antineoplastic Agents / pharmacology*
  • Cell Line, Tumor
  • Cisplatin
  • Coenzyme A Ligases / genetics*
  • Drug Resistance, Neoplasm*
  • Female
  • Gene Expression Regulation, Neoplastic
  • Humans
  • MicroRNAs / genetics*
  • Neoplasm Proteins / genetics
  • Neoplasm Recurrence, Local
  • Ovarian Neoplasms / drug therapy
  • Ovarian Neoplasms / genetics*

Substances

  • ABCG2 protein, human
  • ATP Binding Cassette Transporter, Subfamily G, Member 2
  • Antineoplastic Agents
  • MIRN411 microRNA, human
  • MicroRNAs
  • Neoplasm Proteins
  • Coenzyme A Ligases
  • long-chain-fatty-acid-CoA ligase
  • Cisplatin