title: Bcr-abl silencing by specific small-interference RNA expression vector as a potential treatment for chronic myeloid leukemia.
abstract: BACKGROUND
  RNA interference (RNAi) is the mechanism of gene silencing-mediated messenger RNA degradation by small interference RNA (siRNA), which becomes a powerful tool for in vivo research, especially in the areas of cancer. In this research, the potential use of an expression vector as a specific siRNA producing tool for silencing of Bcr-abl in K562 cell line has been investigated.
  
  
  METHODS
  siRNA specific for Bcr-abl as short hairpin RNA (shRNA) was designed and cloned in expression vector (pRNAH1.1/Neo). K562 cells were cultured in RPMI media and transfected with shRNA expressing vector using lipofectamin 2000. Successful transfection was confirmed by significant increase of enhanced green fluorescent protein (EGFP) levels in K562-treated cells with expression vector (pEGFP-C1). In vitro studies in human K562 cell line entailed modulation of endogenous Bcr-abl mRNA levels which induced apoptosis. Effects of siRNA treatment on K562 cells were measured by ELISA.
  
  
  RESULTS
  Successful expression of siRNA was confirmed by significant reduction of Bcr-abl mRNA levels in K562 cells treated with expression vector (pRNAH1.1/Neo). siRNA directed against Bcr-abl effectively induced apoptosis and reduced viability in human K562 cell lines.
  
  
  CONCLUSIONS
  Expression vector of siRNA can be used in vitro to target specific RNA and to reduce the levels of the specific gene product in the targeted cells. Results of this work suggest that RNAi has potential application for the treatment of a variety of diseases, including those involving abnormal gene expression and viral contamination.
authors.affiliation: Dept. of Biochemistry, Baqiyatallah University, Tehran, Iran.
authors.forename: Ali
authors.initials: A
authors.lastname: Zaree Mahmodabady
authors.forename: Hamid Reza
authors.initials: HR
authors.lastname: Javadi
authors.forename: Mehdi
authors.initials: M
authors.lastname: Kamali
authors.forename: Ali
authors.initials: A
authors.lastname: Najafi
authors.forename: Zahra
authors.initials: Z
authors.lastname: Hojati
mesh_terms: D017209:Apoptosis / Q000502:physiology; D002470:Cell Survival / Q000502:physiology; D016044:Fusion Proteins, bcr-abl / Q000235:genetics*; D015973:Gene Expression Regulation, Leukemic; D015316:Genetic Therapy / Q000379:methods*; D006801:Humans; D020014:K562 Cells; D015464:Leukemia, Myelogenous, Chronic, BCR-ABL Positive / Q000235:genetics* / Q000473:pathology / Q000628:therapy*; D012333:RNA, Messenger / Q000378:metabolism; D034741:RNA, Small Interfering / Q000235:genetics*; D014162:Transfection
chemical_list: D012333:RNA, Messenger; D034741:RNA, Small Interfering; D016044:Fusion Proteins, bcr-abl