title: [Induction of anti-leukemic immunity of dendritic cells derived from multidrug resistant leukemia K562/A02 cells with high expression of P-glycoprotein and sensitive K562 cells].
abstract: This study was aimed to investigate and compare the anti-leukemic effect mediated by dendritic cells (DC) derived from multidrug resistant (MDR) leukemia K562/A02 cells with high expression of p-glycoprotein (P-gp) and sensitive K562 cells. Multidrug resistant K562/A02 cell line and sensitive K562 cell line from chronic myeloid leukemia (CML) were induced for differentiating to DC in complete RPMI 1640 culture medium supplemented with GM-CSF (1 000 U/ml), IL-4 (500 U/ml) and TNF-alpha (100 ng/ml) for 14 days. The morphologic features of DC were observed by means of optical microscopy and the phenotype of DC was detected by flow cytometry. T-cell stimulating activity was determined by allogeneic lymphocyte reaction (allo-MLR). Cytotoxic activity was measured by MTT assay. The results indicated that DC derived from K562/A02 cells and K562 cells similarly showed the typical morphology of dendritic cell and expressed the surface differentiation antigens and costimulatory molecules CD1a, CD83, HLA-DR, CD80 and CD86 of DC. In allo-MLR, K562/A02-DC had a higher capacity to induce lymphocyte proliferation, compared with K562-DC (P < 0.05). K562/A02-DC and K562-DC could similarly generate specific cytotoxic activity against K562/A02 cells or K562 cells respectively, but low reactivity against HL-60 cells. More importantly, the cytotoxic activity mediated by K562/A02-DC was stronger than that by K562-DC against K562/A02 cells or HL-60/VCR cells (P < 0.01, respectively). It is concluded that functional DC can be differentiated from multidrug resistant leukemia K562/A02 cells as well as sensitive K562 cells in the presence of GM-CSF, IL-4 and TNF-alpha. Especially, DC derived from K562/A02 cells can induced a p-glycoprotein specific anti-leukemic immunity.
authors.affiliation: Department of Hematology and Oncology, The Second Hospital of Lanzhou University, Lanzhou 730030, China.
authors.forename: Yan-Ming
authors.initials: YM
authors.lastname: Zhang
authors.forename: Lian-Sheng
authors.initials: LS
authors.lastname: Zhang
authors.forename: Yu-Fang
authors.initials: YF
authors.lastname: Zhang
authors.forename: Liang-Cai
authors.initials: LC
authors.lastname: Yi
authors.forename: Ye
authors.initials: Y
authors.lastname: Chai
authors.forename: Fei-Xue
authors.initials: FX
authors.lastname: Song
authors.forename: Peng-Yun
authors.initials: PY
authors.lastname: Zeng
authors.forename: Ying
authors.initials: Y
authors.lastname: Liu
mesh_terms: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1 / Q000096:biosynthesis*; D015703:Antigens, CD / Q000032:analysis; D018949:Antigens, CD1 / Q000032:analysis; D018122:B7-1 Antigen / Q000032:analysis; D051940:B7-2 Antigen / Q000032:analysis; D002454:Cell Differentiation / Q000187:drug effects / Q000276:immunology; D003602:Cytotoxicity, Immunologic; D003713:Dendritic Cells / Q000166:cytology / Q000276:immunology* / Q000378:metabolism; D004317:Doxorubicin / Q000494:pharmacology; D018432:Drug Resistance, Multiple; D019008:Drug Resistance, Neoplasm; D005434:Flow Cytometry; D016178:Granulocyte-Macrophage Colony-Stimulating Factor / Q000494:pharmacology; D006801:Humans; D007136:Immunoglobulins / Q000032:analysis; D015847:Interleukin-4 / Q000494:pharmacology; D020014:K562 Cells; D007938:Leukemia / Q000276:immunology / Q000473:pathology; D008562:Membrane Glycoproteins / Q000032:analysis; D014409:Tumor Necrosis Factor-alpha / Q000494:pharmacology; D000097802:CD83 Antigen
chemical_list: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D015703:Antigens, CD; D018949:Antigens, CD1; D018122:B7-1 Antigen; D051940:B7-2 Antigen; D004317:Doxorubicin; D016178:Granulocyte-Macrophage Colony-Stimulating Factor; D007136:Immunoglobulins; D015847:Interleukin-4; D008562:Membrane Glycoproteins; D014409:Tumor Necrosis Factor-alpha; D000097802:CD83 Antigen; C419393:CD1a antigen