title: Down-regulation of HSP40 gene family following OCT4B1 suppression in human tumor cell lines.
abstract: OBJECTIVE
  The OCT4B1, as one of OCT4 variants, is expressed in cancer cell lines and tissues more than other variants and plays an important role in apoptosis and stress (heat shock protein) pathways. The present study was designed to determine the effects of OCT4B1 silencing on expressional profile of HSP40 gene family expression in three different human tumor cell lines.
  
  
  METHODS
  The OCT4B1 expression was suppressed by specific siRNA transfection in AGS (gastric adenocarcinoma), 5637 (bladder tumor) and U-87MG (brain tumor) cell lines employing Lipofectamine reagent. Real-time PCR array technique was employed for RNA qualification. The fold changes were calculated using RT(2) Profiler PCR array data analysis software version 3.5.
  
  
  RESULTS
  Our results indicated that fifteen genes (from 36 studied genes) were down-regulated and two genes (DNAJC11 and DNAJC5B) were up-regulated in all three studied tumor cell lines by approximately more than two folds. The result of other studied genes (19 genes) showed different expressional pattern (up or down-expression) based on tumor cell lines.
  
  
  CONCLUSIONS
  According to the findings of the present study, we may suggest that there is a direct correlation between OCT4B1 expression in tumor cell lines (and tissues) and HSP40 family gene expressions to escape from apoptosis and cancer expansion.
authors.affiliation: Molecular Medicine Research Center, Rafsanjan University of Medical Sciences, Rafsanjan, Iran.
authors.forename: Mohammad Reza
authors.initials: MR
authors.lastname: Mirzaei
authors.affiliation: Departments of Biotechnology, Institute of Science and High Technology and Environmental Sciences, Graduate University of Advanced Technology, Kerman, Iran.
authors.forename: MalekHosein
authors.initials: M
authors.lastname: Asadi
authors.affiliation: Departments of Molecular Genetics, Faculty of Biological Sciences, Tarbiat Modares University, Tehran, Iran.
authors.forename: Seyed Javad
authors.initials: SJ
authors.lastname: Mowla
authors.affiliation: Molecular Medicine Research Center, Rafsanjan University of Medical Sciences, Rafsanjan, Iran.
authors.forename: Gholamhossin
authors.initials: G
authors.lastname: Hassanshahi
authors.affiliation: Molecular Medicine Research Center, Rafsanjan University of Medical Sciences, Rafsanjan, Iran.
authors.forename: Zahra
authors.initials: Z
authors.lastname: Ahmadi
keywords: HSP40 gene family; OCT4B1; Tumor cell lines; siRNA