title: Role of extracelluar regulated protein kinases in FTY720-induced apoptosis of leukemia cell lines HL-60 and U937.
abstract: The effects of a novel immunosuppressive agent FTY720 on proliferation inhibition and apoptosis of acute leukemia cell lines HL-60 and U937, and the role of extracelluar regulated protein kinase (ERK) in the course of proliferation inhibition and apoptosis induced by FTY720 were studied. The proliferation inhibition rate of HL-60 and U937 cells by various concentrations of FTY720 was detected by MTT assay. Cell apoptosis was detected by DNA fragment analysis and flow cytometry. The phosphorylated ERK1/2 protein expression was observed by Western blotting. The change of intracellular distribution of ERK1/2 protein was identified by SP immunohistochemical staining. The results showed that FTY720 could inhibit the growth of HL-60 and U937 cells effectively in a dose-dependent manner. After incubation with FTY720 for 24 h, apoptosis was observed in HL-60 and U937 cells. The intracellular expression of phosphorylated ERK1/2 protein was also down-regulated and the distribution of ERK1/2 protein in cell nuclear was reduced during FTY720-induced apoptosis. So, that FTY720 inhibited ERK1/2 phosphorylation might mediate the role of FTY720-induced apoptosis and proliferation inhibition of leukemia cells.
authors.affiliation: Department of Hematology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030.
authors.forename: Dengju
authors.initials: D
authors.lastname: Li
authors.forename: Yaozhen
authors.initials: Y
authors.lastname: Zhang
authors.forename: Xiangrong
authors.initials: X
authors.lastname: Hu
authors.forename: Wenjing
authors.initials: W
authors.lastname: Cao
authors.forename: Wei
authors.initials: W
authors.lastname: Huang
mesh_terms: D017209:Apoptosis / Q000187:drug effects*; D002455:Cell Division / Q000187:drug effects; D048049:Extracellular Signal-Regulated MAP Kinases / Q000378:metabolism; D000068876:Fingolimod Hydrochloride; D018922:HL-60 Cells; D006801:Humans; D007166:Immunosuppressive Agents / Q000494:pharmacology; D019950:Mitogen-Activated Protein Kinase 1 / Q000378:metabolism*; D048052:Mitogen-Activated Protein Kinase 3 / Q000378:metabolism*; D010766:Phosphorylation; D011409:Propylene Glycols / Q000494:pharmacology*; D015398:Signal Transduction; D013110:Sphingosine / Q000031:analogs & derivatives; D020298:U937 Cells
chemical_list: D007166:Immunosuppressive Agents; D011409:Propylene Glycols; D048049:Extracellular Signal-Regulated MAP Kinases; D019950:Mitogen-Activated Protein Kinase 1; D048052:Mitogen-Activated Protein Kinase 3; D000068876:Fingolimod Hydrochloride; D013110:Sphingosine