title: [Effect of Soluble CD40L on Leukemia K562 Cells and Its Mechanism].
abstract: OBJECTIVE
  To investigate the effect of sCD40L on biological behavior of leukemia cell line K562 and the possible mechanism.
  
  
  METHODS
  The different concentration of sCD40L was used to treat K562 cells, and the optimum concentration of sCD40L was screened by detecting the proliferation inhibition rate of K562 cells. The optimum concentration of sCD40L was used to treat K562 cells, the cell apoptosis rate and expression level of P53 and BCL-2 were detected by flow cytometry and the expression levels of Caspase 8 and Caspase 3 were detected by ELISA.
  
  
  RESULTS
  The optimum concentration of sCD40L was 4 µg/ml. After treated with sCD40L, the cell apoptosis rate, the expression of apoptosis-related factor P53 and the expression of Caspase 8 and Caspase 3 were significantly up-regulated in K562 cells,but the expression of BCL-2 was significantly down-regulated.
  
  
  CONCLUSIONS
  4 µg/ml sCD40L can inhibit the cell proliferation and promote the apoptosis of K562 cells, its mechanism may be related with mitochondrial and P53 pathway.
authors.affiliation: Department of Hematology, Affiliated Hospital of Zunyi Medical College, Zunyi 563003, Guizhou Province, China.
authors.forename: Ming-Qiang
authors.initials: MQ
authors.lastname: Ren
authors.affiliation: Department of Hematology, Affiliated Hospital of Zunyi Medical College, Zunyi 563003, Guizhou Province, China.E-mail: zyfychenqi@163.com.
authors.forename: Qi
authors.initials: Q
authors.lastname: Chen
authors.affiliation: Department of Hematology, Affiliated Hospital of Zunyi Medical College, Zunyi 563003, Guizhou Province, China.
authors.forename: Dian-Yu
authors.initials: DY
authors.lastname: Li
mesh_terms: D017209:Apoptosis; D023201:CD40 Ligand; D053148:Caspase 3; D049109:Cell Proliferation; D015536:Down-Regulation; D006801:Humans; D020014:K562 Cells; D007938:Leukemia; D019253:Proto-Oncogene Proteins c-bcl-2
chemical_list: D019253:Proto-Oncogene Proteins c-bcl-2; D023201:CD40 Ligand; C505407:CASP3 protein, human; D053148:Caspase 3