Potential role of HIF-1-responsive microRNA210/HIF3 axis on gemcitabine resistance in cholangiocarcinoma cells.
Runglawan SilakitYingpinyapat KitiratSuyanee ThongchotWatcharin LoilomeAnchalee TechasenPiti UngarreevittayaNarong KhuntikeoPuangrat YongvanitJi Hye YangNam Hee KimJong In YookNisana NamwatPublished in: PloS one (2018)
MicroRNA-210 (miR-210) is a robust target for hypoxia-inducible factor, and its overexpression has been detected in a variety of solid tumors. However, the role of miR-210 in the development, progression and response to therapy in cholangiocarcinoma (CCA) remains undefined. We report here that high miR-210 expression was significantly correlated with the shorter survival of CCA patients. Overexpression of miR-210 inhibited CCA cell proliferation at the G2/M phase and reduced the gemcitabine sensitivity in CCA cells under CoCl2-induced pseudohypoxia. Concomitantly, inhibition of endogenous miR-210 activity using miRNA sponges increased cell proliferation under CoCl2-induced pseudohypoxia, resulting in an increase in gemcitabine sensitivity in CCA cells. We showed that HIF-3α, a negative controller of HIF-1α, was a target of miR-210 constituting a feed-forward hypoxic regulatory loop. Our data suggest an important role of miR-210 in sustaining HIF-1α activity via the suppression of HIF-3α, regulating cell growth and chemotherapeutic drug resistance in CCA.
Keyphrases
- cell proliferation
- long non coding rna
- cell cycle
- induced apoptosis
- long noncoding rna
- pi k akt
- cell cycle arrest
- endothelial cells
- poor prognosis
- transcription factor
- end stage renal disease
- stem cells
- newly diagnosed
- signaling pathway
- locally advanced
- endoplasmic reticulum stress
- big data
- cell death
- bone marrow
- smoking cessation
- stress induced
- binding protein