title: Distinct pathways of apoptosis triggered by FTY720, etoposide, and anti-Fas antibody in human T-lymphoma cell line (Jurkat cells).
abstract: 2-amino-2-[2-(4-octylphenyl)ethyl] propane-1,3-diol hydrochloride (FTY720), a synthetic product derived from a metabolite of Isaria sinclairii, has been demonstrated to have a potent immunosuppressive activity that induces apoptotic cell death in T cells and several other cell lines. In this study, using the human T-lymphoma cell line, Jurkat cells, we investigated the apoptotic signal transduction mediated by FTY720, in particular comparing its role on the cleavage of caspases, with that mediated by etoposide or anti-Fas antibody. All of these agents cleaved caspases, inducing their active form in the affected cells. Pretreatment with a broad caspase inhibitor [benzyloxycarbonyl-Val-Ala-Asp-(Ome) fluoromethyl ketone] markedly decreased the incidence of apoptotic cells induced by FTY720, etoposide, and anti-Fas antibody, through the abrogation of cleavage of Bid, poly(ADP-ribose) polymerase, and caspases 3, 8, and 9. The overexpression of Bcl-2 gene prevented FTY720- and etoposide-mediated apoptosis, but not Fas-mediated apoptosis. In addition, mitochondria were demonstrated to play a critical role in FTY720-triggered cell death, suggesting that this drug has a potent anticancer activity.
authors.affiliation: Department of Experimental Surgery and Bioengineering, National Children's Medical Research Center, Tokyo, Japan.
authors.forename: Masayuki
authors.initials: M
authors.lastname: Fujino
authors.forename: Xiao-Kang
authors.initials: XK
authors.lastname: Li
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Kitazawa
authors.forename: Lei
authors.initials: L
authors.lastname: Guo
authors.forename: Mikiko
authors.initials: M
authors.lastname: Kawasaki
authors.forename: Naoko
authors.initials: N
authors.lastname: Funeshima
authors.forename: Takashi
authors.initials: T
authors.lastname: Amano
authors.forename: Seiichi
authors.initials: S
authors.lastname: Suzuki
mesh_terms: D000906:Antibodies / Q000494:pharmacology*; D000972:Antineoplastic Agents, Phytogenic / Q000494:pharmacology*; D017209:Apoptosis / Q000187:drug effects*; D015153:Blotting, Western; D020169:Caspases / Q000378:metabolism; D053938:DNA Fragmentation / Q000187:drug effects; D004789:Enzyme Activation / Q000187:drug effects; D020536:Enzyme Activators / Q000494:pharmacology; D005047:Etoposide / Q000494:pharmacology*; D000068876:Fingolimod Hydrochloride; D015972:Gene Expression Regulation, Neoplastic / Q000187:drug effects; D019254:Genes, bcl-2 / Q000187:drug effects; D006801:Humans; D007166:Immunosuppressive Agents / Q000494:pharmacology*; D007202:Indicators and Reagents; D019169:Jurkat Cells; D011409:Propylene Glycols / Q000494:pharmacology*; D013110:Sphingosine / Q000031:analogs & derivatives; D019014:fas Receptor / Q000276:immunology*
chemical_list: D000906:Antibodies; D000972:Antineoplastic Agents, Phytogenic; D020536:Enzyme Activators; D007166:Immunosuppressive Agents; D007202:Indicators and Reagents; D011409:Propylene Glycols; D019014:fas Receptor; D005047:Etoposide; D020169:Caspases; D000068876:Fingolimod Hydrochloride; D013110:Sphingosine