title: [Reversion the multidrug resistance of human breast carcinoma cells by RNA interference targeting HIF-1 alpha gene].
abstract: OBJECTIVE
  To reverse the multidrug resistant (MDR) phenotype of human breast carcinoma cells by small hairpin RNA (shRNA) technique targeting hypoxia-inducible factor (HIF)-1alpha gene.
  
  
  METHODS
  Small hairpin RNA (shRNA) eukaryotic expression vector targeting HIF-1alpha gene, named pSilencer-HIF, was constructed and transfected into MCF-7/ADR human breast cancer cells by liposome technique. Tumor cell livability (TCL) and Rhodamine 123 efflux assay were used to monitor the biological changes of the transfected cells. The mRNA and protein expression of HIF-1alpha and mdr-1 were investigated by RT-PCR and Western blot.
  
  
  RESULTS
  The successful construction of pSilencer-HIF plasmid was confirmed by DNA sequencing. HIF-1alpha mRNA and protein levels were significantly decreased in MCF-7/ADR cells after the transfection and there was a direct correlation between HIF-1alpha and mdr-1 expression. By comparing the cells transfected with control vector and the MCF-7/ADR cells transfected with pSilencer-HIF, a reduced TCL from 76% to 43%, and an increased Rhodamine 123 fluorescence intensity from 22.0% to 86.6% were observed.
  
  
  CONCLUSIONS
  pSilencer-HIF-1alpha has been successfully constructed. The inhibition of HIF-1alpha expression through shRNA technique can significantly reverse the multidrug resistance phenotype of MCF-7/ADR cells.
authors.affiliation: Department of Pathology, Medical School of Shandong University, Jinan 250012, China.
authors.forename: Chao
authors.initials: C
authors.lastname: Ma
authors.forename: Geng-yin
authors.initials: GY
authors.lastname: Zhou
authors.forename: Ying
authors.initials: Y
authors.lastname: Xiao
authors.forename: Peng
authors.initials: P
authors.lastname: Gao
authors.forename: Cui-juan
authors.initials: CJ
authors.lastname: Zhang
mesh_terms: D001943:Breast Neoplasms / Q000473:pathology*; D045744:Cell Line, Tumor; D018432:Drug Resistance, Multiple / Q000187:drug effects* / Q000502:physiology; D019008:Drug Resistance, Neoplasm / Q000187:drug effects*; D006801:Humans; D051795:Hypoxia-Inducible Factor 1, alpha Subunit / Q000037:antagonists & inhibitors*; D034622:RNA Interference; D034741:RNA, Small Interfering / Q000494:pharmacology*
chemical_list: D051795:Hypoxia-Inducible Factor 1, alpha Subunit; D034741:RNA, Small Interfering