title: Ex vivo purging of leukemia cells using tumor-necrosis-factor-related apoptosis-inducing ligand in hematopoietic stem cell transplantation.
abstract: The aim of this study was to evaluate the potential of tumor-necrosis-factor-related apoptosis-inducing ligand TRAIL to eradicate leukemia cell lines, while sparing normal hematopoietic stem cells. Human Jurkat and Molt-4 cell lines were used to optimize the purging process in umbilical cord blood (UCB) mononuclear cells. The Jurkat cell line was TRAIL sensitive and TRAIL-resistant Molt-4 cell line became sensitive after being treated with TRAIL and a low dose of doxorubicin (0.1 micro M), but UCB mononuclear cells remained resistant. DR4 expression was increased when Jurkat cells were treated with TRAIL, and DR5 expression increased after exposing Molt-4 cells to TRAIL plus a low dose of doxorubicin for 24 h. The expression of DR4 and DR5 in UCB mononuclear cells was unchanged after treatment with TRAIL, a low-dose doxorubicin, or TRAIL plus a low dose of doxorubicin. In TRAIL-sensitive Jurkat cells, caspases 8, 9, 3, and 7 were activated by TRAIL treatment and activation of caspases was augmented by TRAIL plus a low dose of doxorubicin than TRAIL or a low dose of doxorubicin alone in Molt-4 cells. Experiments involving mixture of UCB mononuclear cells and Jurkat or Molt-4 cells showed a marked eradication of leukemia cells and the limiting dilution assay demonstrated an eradication rate of more than 4 logs after 24 h incubation with 100 ng/ml of TRAIL in Jurkat cells. In the case of Molt-4 cells, the eradication rate was about 3 logs when TRAIL was used in combination with a low dose of doxorubicin. No significant decrease in the number of granulocyte-macrophage colony-forming unit) (CFU-GM) colonies was detected when UCB mononuclear cells were treated with TRAIL in combination with a low dose of doxorubicin. These results suggest that TRAIL offers the possibility of being used as an ex vivo purging agent for autologous transplantation in hematologic malignancies.
authors.affiliation: Division of Hematology-Oncology, Department of Internal Medicine, Soon Chun Hyang University College of Medicine, Seoul, Korea.
authors.forename: N-S
authors.initials: NS
authors.lastname: Lee
authors.forename: H-J
authors.initials: HJ
authors.lastname: Cheong
authors.forename: S-J
authors.initials: SJ
authors.lastname: Kim
authors.forename: S-E
authors.initials: SE
authors.lastname: Kim
authors.forename: C-K
authors.initials: CK
authors.lastname: Kim
authors.forename: K-T
authors.initials: KT
authors.lastname: Lee
authors.forename: S-K
authors.initials: SK
authors.lastname: Park
authors.forename: S-H
authors.initials: SH
authors.lastname: Baick
authors.forename: D-S
authors.initials: DS
authors.lastname: Hong
authors.forename: H-S
authors.initials: HS
authors.lastname: Park
authors.forename: J-H
authors.initials: JH
authors.lastname: Won
mesh_terms: D051017:Apoptosis Regulatory Proteins; D020169:Caspases / Q000187:drug effects / Q000378:metabolism; D004317:Doxorubicin / Q000494:pharmacology; D004353:Drug Evaluation, Preclinical; D005312:Fetal Blood / Q000187:drug effects; D018380:Hematopoietic Stem Cell Transplantation / Q000379:methods* / Q000592:standards; D006801:Humans; D007938:Leukemia / Q000473:pathology*; D008562:Membrane Glycoproteins / Q000494:pharmacology* / Q000627:therapeutic use; D053220:Receptors, TNF-Related Apoptosis-Inducing Ligand; D018124:Receptors, Tumor Necrosis Factor / Q000032:analysis; D053221:TNF-Related Apoptosis-Inducing Ligand; D014182:Transplantation, Autologous; D014407:Tumor Cells, Cultured; D014409:Tumor Necrosis Factor-alpha / Q000494:pharmacology* / Q000627:therapeutic use
chemical_list: D051017:Apoptosis Regulatory Proteins; D008562:Membrane Glycoproteins; D053220:Receptors, TNF-Related Apoptosis-Inducing Ligand; D018124:Receptors, Tumor Necrosis Factor; D053221:TNF-Related Apoptosis-Inducing Ligand; C105190:TNFRSF10A protein, human; C505639:TNFRSF10B protein, human; C505653:TNFSF10 protein, human; D014409:Tumor Necrosis Factor-alpha; D004317:Doxorubicin; D020169:Caspases