title: [Effect of Apollon siRNA combined with tetramethylpyrazine on proliferation and apoptosis of leukemia K562 cells].
abstract: OBJECTIVE
  To investigate the effect of small interfering RNA (siRNA) silencing Apollon gene combined with tetramethylpyrazine (TMP) on the proliferation and apoptosis of human chronic myeloid leukemia cell line K562.
  
  
  METHODS
  K562 cells were divided into blank control, negative control, and RNA interference (RNAi) group. For the RNAi group, the pGPHI-GFP-Neo-Apollon eukaryotic expression vector based on the best Apollon siRNA fragments screened out in previous experiments was constructed; the blank control group received no treatment, and the negative control group was transfected with negative plasmid vector. The mRNA and protein expression of Apollon was measured by RT-PCR and cell immunofluorescence, respectively. Additionally, TMP (320 μg/mL) was applied to set TMP, TMP+negative control, and TMP+RNAi groups. The cell viability and apoptosis rate were determined by MTT assay and flow cytometry, respectively.
  
  
  RESULTS
  The constructed vector was stably expressed in K562 cells. The RNAi group had significantly lower mRNA and protein expression of Apollon than the blank control group and negative control (P<0.05). The RNAi group had significantly increased proliferation inhibition rate and apoptosis rate, as compared with the blank contorl group (P<0.05). The TMP+RNAi group had significantly increased proliferation inhibition rate and apoptosis rate, as compared with the RNAi, and TMP groups (P<0.05).
  
  
  CONCLUSIONS
  Apollon siRNA can significantly inhibit the proliferation and promote the apoptosis of K562 cells, and the addition of TMP can further increase the proliferation inhibition rate and apoptosis rate, suggesting that siRNA technology combined with drugs has a significant potential value in the treatment of leukemia.
authors.affiliation: Department of Pediatrics, Affiliated Hospital of Binzhou Medical University, Binzhou, Shandong 256603, China. jiaxiuhong001@163.com.
authors.forename: Xiu-Hong
authors.initials: XH
authors.lastname: Jia
authors.forename: Fei-Fei
authors.initials: FF
authors.lastname: Xiao
authors.forename: Jian-Chang
authors.initials: JC
authors.lastname: Li
mesh_terms: D017209:Apoptosis; D049109:Cell Proliferation; D005434:Flow Cytometry; D006801:Humans; D051034:Inhibitor of Apoptosis Proteins / Q000037:antagonists & inhibitors* / Q000235:genetics; D020014:K562 Cells; D011719:Pyrazines / Q000494:pharmacology*; D034741:RNA, Small Interfering / Q000235:genetics*
chemical_list: C401541:BIRC6 protein, human; D051034:Inhibitor of Apoptosis Proteins; D011719:Pyrazines; D034741:RNA, Small Interfering; C017953:tetramethylpyrazine