title: Antisense bcl-2 transfection up-regulates anti-apoptotic and anti-oxidant thioredoxin in neuroblastoma cells.
abstract: Antisense bcl-2 therapy combined with chemotherapy has been proved to be effective in various tumors. However, the role played by antisense bcl-2 therapy alone is not clear. In this study, we compared the apoptosis and the protein profiles of antisense bcl-2 transfected human neuroblastoma SK-N-MC cells to the control cells. Flow cytometric data indicated that antisense bcl-2 transfection did not lead to more extensive apoptosis in SK-N-MC cells (14.9 +/- 3.8%) than the control cells (10.3 +/- 2.3%). The above observation was confirmed by fluorescence microscopy using Hoechst 33258 staining. However, antisense bcl-2 induced changes in the expression of various proteins as shown by proteomic comparison, which included the up-regulation of the anti-apoptotic and anti-oxidant protein thioredoxin. By western blot validation, thioredoxin was found to be up-regulated by 2.9-folds with the corresponding down-regulation of Bcl-2 by 2.1-folds. The up-regulation of thioredoxin may be a compensating mechanism for cell survival in neuroblastoma when Bcl-2 expression is suppressed, and it may to some extent attenuate the effectiveness of antisense bcl-2 therapy.
authors.affiliation: Department of Pathology, Peking Union Medical College Hospital, Beijing, P.R. China. yitingl@bcm.tmc.edu
authors.forename: Yiting
authors.initials: Y
authors.lastname: Li
authors.forename: Zhaohui
authors.initials: Z
authors.lastname: Lu
authors.forename: Fang
authors.initials: F
authors.lastname: Chen
authors.forename: Jian
authors.initials: J
authors.lastname: Guan
authors.forename: Liping
authors.initials: L
authors.lastname: Hu
authors.forename: Yanfeng
authors.initials: Y
authors.lastname: Xu
authors.forename: Jie
authors.initials: J
authors.lastname: Chen
mesh_terms: D017209:Apoptosis / Q000502:physiology*; D001932:Brain Neoplasms / Q000235:genetics / Q000378:metabolism* / Q000628:therapy; D045744:Cell Line, Tumor; D002470:Cell Survival / Q000502:physiology; D016373:DNA, Antisense / Q000235:genetics; D015972:Gene Expression Regulation, Neoplastic; D015316:Genetic Therapy; D006801:Humans; D051034:Inhibitor of Apoptosis Proteins; D008869:Microtubule-Associated Proteins / Q000378:metabolism; D009363:Neoplasm Proteins / Q000235:genetics / Q000378:metabolism*; D009447:Neuroblastoma / Q000235:genetics / Q000378:metabolism* / Q000628:therapy; D040901:Proteomics; D019253:Proto-Oncogene Proteins c-bcl-2 / Q000235:genetics / Q000378:metabolism / Q000494:pharmacology* / Q000502:physiology*; D012333:RNA, Messenger / Q000032:analysis; D000077022:Survivin; D013879:Thioredoxins / Q000235:genetics / Q000378:metabolism*; D014162:Transfection; D051020:bcl-X Protein
chemical_list: C494811:BCL2L1 protein, human; C107489:BIRC5 protein, human; D016373:DNA, Antisense; D051034:Inhibitor of Apoptosis Proteins; D008869:Microtubule-Associated Proteins; D009363:Neoplasm Proteins; D019253:Proto-Oncogene Proteins c-bcl-2; D012333:RNA, Messenger; D000077022:Survivin; D051020:bcl-X Protein; D013879:Thioredoxins