title: [Influence of nm23-H1 gene silence in K562 cell on its differentiation toward megakaryocyte].
abstract: OBJECTIVE
  To construct a stable nm23-H1-knock-down cell model with K562 cell line and study its differentiation toward megakaryocyte.
  
  
  METHODS
  Eukaryotic expression vector pSilencer 4.1-CMV-sinm23 expressing siRNA targeting nm23-H1 was transfected into K562 cells with lipofectamine2000. Cells with stably nm23-H1 silence were screened out by G418. Real-time quantitative PCR, immunocytochemistry, western blot were used to confirm the nm23-H1-knock-down K562 model. Cell differentiation capacity was detected by NBT reduction assay. Surface antigen Gp IIb-IIIa (CD41) of knock-down cells treated with phorbol 12-myristate 13-acetate was analyzed by flow cytometry. Western blot was used to detect the ERK1/2 signal pathway after the stimulation of phorbol 12-myristate 13-acetate.
  
  
  RESULTS
  Endogenous nm23-H1 was silenced by pSilencer 4.1-CMV-sinm23 and the silence efficiency was up to 75% and 70% in mRNA and protein levels respectively compared with the mock cells. Under phorbol 12-myristate 13-acetate treatment, the knock-down cells displayed a significantly increased differentiation ability toward megakaryocyte compared with control. The NBT reduction values were (0.31 +/- 0.07) and (0.23 +/- 0.05) respectively. Further results revealed that nm23-H1 gene regulating the megakaryocytic differentiation was due in part to the increased ERK1/2 phosphorylation.
  
  
  CONCLUSIONS
  A stable nm23-H1-knock-down K562 cell model is successfully constructed. nm23-H1 involves in regulating the megakaryocytic differentiation of K562 cell line.
authors.affiliation: Biomedicine Research & Development Center, Institute of Pharmaceutical Science, Jinan University, Guangzhou 510632, China.
authors.forename: Lin
authors.initials: L
authors.lastname: Jin
authors.forename: Ge
authors.initials: G
authors.lastname: Liu
authors.forename: Chuan-hai
authors.initials: CH
authors.lastname: Zhang
authors.forename: Sheng
authors.initials: S
authors.lastname: Xiong
authors.forename: Mei-ying
authors.initials: MY
authors.lastname: Zhang
authors.forename: Qiu-ying
authors.initials: QY
authors.lastname: Liu
authors.forename: Chui-wen
authors.initials: CW
authors.lastname: Qian
authors.forename: Yi-fei
authors.initials: YF
authors.lastname: Wang
mesh_terms: D002454:Cell Differentiation / Q000235:genetics; D055785:Gene Knockdown Techniques; D006801:Humans; D020014:K562 Cells; D008533:Megakaryocytes / Q000166:cytology*; D054778:NM23 Nucleoside Diphosphate Kinases / Q000235:genetics*; D034622:RNA Interference
chemical_list: D054778:NM23 Nucleoside Diphosphate Kinases