title: CD133 expression in renal cell carcinoma (RCC) is correlated with nuclear hypoxia-inducing factor 1α (HIF-1α).
abstract: OBJECTIVE
  In our previous study, we have found that the hypoxia-inducible factor 1α (HIF-1α) is upregulated in renal cell carcinoma (RCC) tissues compared with para-cancer normal tissues by 2-dimensional polyacrylamide gel electrophoresis. It was reported that hypoxic conditions were correlated with cancer stem cell generation and HIF-1α acted as a transcription regulator in nuclear HIF-1α expression. Therefore, in this study we investigate the relation between CD133 and nuclear HIF-1α expression levels in RCC tissues.
  
  
  METHODS
  In this study 61 RCC tissues from the patients that treated with radical nephrectomy were collected. Then, we investigated the expression of CD133 and nuclear HIF-1α expression by immunohistochemistry. To verify the relation between CD133 and nuclear HIF-1α expression, we treated 786-O cells with cobalt chloride. The expression of CD133 on 786-O cells was analyzed by flowcytometry.
  
  
  RESULTS
  The immunohistochemical study showed that CD133 was correlated with tumor stage and metastatic stage, whereas nuclear HIF-1α had no association with clinicopathological parameters. However, the expression of nuclear HIF-1α was correlated with CD133. The CD133 expression in 786-O cells was enhanced by cobalt chloride, which meant that CD133 expression was affected by hypoxia.
  
  
  CONCLUSIONS
  Our study showed that in RCC, CD133 expression was strongly related to nuclear HIF-1α and the expression of CD133 might be upregulated under hypoxia environment.
authors.affiliation: The Department of Urology, The Second Affiliated Hospital of Soochow University, Suzhou 215006, China.
authors.forename: Chuanyang
authors.initials: C
authors.lastname: Sun
authors.forename: Hui
authors.initials: H
authors.lastname: Song
authors.forename: Hua
authors.initials: H
authors.lastname: Zhang
authors.forename: Chuansheng
authors.initials: C
authors.lastname: Hou
authors.forename: Tianhang
authors.initials: T
authors.lastname: Zhai
authors.forename: Lv
authors.initials: L
authors.lastname: Huang
authors.forename: Liang
authors.initials: L
authors.lastname: Zhang
mesh_terms: D000071916:AC133 Antigen; D000328:Adult; D000368:Aged; D015703:Antigens, CD / Q000096:biosynthesis* / Q000235:genetics / Q000378:metabolism; D002292:Carcinoma, Renal Cell / Q000235:genetics / Q000378:metabolism* / Q000473:pathology / Q000601:surgery; D015687:Cell Hypoxia / Q000502:physiology; D005260:Female; D015972:Gene Expression Regulation, Neoplastic; D006023:Glycoproteins / Q000096:biosynthesis* / Q000235:genetics / Q000378:metabolism; D006801:Humans; D051795:Hypoxia-Inducible Factor 1, alpha Subunit / Q000096:biosynthesis* / Q000235:genetics / Q000378:metabolism; D007150:Immunohistochemistry; D007680:Kidney Neoplasms / Q000235:genetics / Q000378:metabolism* / Q000473:pathology / Q000601:surgery; D008297:Male; D008875:Middle Aged; D009392:Nephrectomy / Q000379:methods; D010455:Peptides / Q000235:genetics / Q000378:metabolism; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism; D055815:Young Adult
chemical_list: D000071916:AC133 Antigen; D015703:Antigens, CD; D006023:Glycoproteins; C497442:HIF1A protein, human; D051795:Hypoxia-Inducible Factor 1, alpha Subunit; C000606023:PROM1 protein, human; D010455:Peptides; D014157:Transcription Factors