title: MiR-183 modulates multi-drug resistance in hepatocellular cancer (HCC) cells via miR-183-IDH2/SOCS6-HIF-1α feedback loop.
abstract: MiR-183 acts as an oncomiR and is usually upregulated in hepatocellular cancer (HCC). This study aims to study the association between miR-183 dysregulation and multi-drug resistance (MDR). Also, how it is dysregulated in HCC cells was investigated.
  
  
  
  The association between miR-183 and HIF-1α in HCC cell line BEL-7402 and the multidrug-resistant variant BEL-7402/5-fluorouracil (BEL-7402/5-FU) were studied using qRT-PCR and Western blot analysis. The mediators involved in feedback regulation between miR-183 and HIF-1α were further studied. Then, the effect of the miR-183-SOCS6 axis on IC50 of BEL-7402/5-FU cells to 5-FU were investigated by MTT assay.
  
  
  
  The expression of miR-183 and HIF-1α are positively correlated in BEL-7402 and BEL-7402/5-FU cells. IDH2 knockdown resulted in significantly increased HIF-1α expression in both BEL-7402 and BEL-7402/5-FU cells. Knockdown of SOCS6 had similar but stronger effect as miR-183 in promoting MRP2, P-gp, p-STAT3 and HIF-1α expression in BEL-7402 cells, while SOCS6 overexpression also showed similar but stronger effect as miR-183 inhibition in reducing MRP2, P-gp, p-STAT3 and HIF-1α levels in BEL-7402/5-FU cells. Both SOCS6 overexpression and miR-183 knockdown significantly increased the sensitivity of BEL-7402/5-FU cells to 5-FU. MiR-183 overexpression partly abrogated the effect of SOCS6 in enhancing 5-FU sensitivity.
  
  
  
  Both HIF-1α-miR-183-IDH2-HIF-1α and HIF-1α-miR-183-SOCS6-p-STAT3-HIF-1α feedback loops are involved in miR-183 upregulation in HCC cells. MiR-183 can modulate MDR of HCC cells at least partly through suppressing SOCS6.
authors.affiliation: Clinical Laboratory, the Central Hospital of Yishui, Linyi, Shandong, China. guojianlee@outlook.com.
authors.forename: X-J
authors.initials: XJ
authors.lastname: Wang
authors.forename: D-L
authors.initials: DL
authors.lastname: Zhang
authors.forename: C
authors.initials: C
authors.lastname: Fu
authors.forename: B-Z
authors.initials: BZ
authors.lastname: Wei
authors.forename: G-J
authors.initials: GJ
authors.lastname: Li
mesh_terms: D006528:Carcinoma, Hepatocellular / Q000235:genetics / Q000378:metabolism*; D045744:Cell Line, Tumor; D018432:Drug Resistance, Multiple / Q000235:genetics; D019008:Drug Resistance, Neoplasm / Q000235:genetics; D025461:Feedback, Physiological; D006801:Humans; D008113:Liver Neoplasms / Q000235:genetics / Q000378:metabolism*; D035683:MicroRNAs / Q000235:genetics / Q000378:metabolism
chemical_list: C000610112:MIRN1183 microRNA, human; D035683:MicroRNAs