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Effect of EBV LMP1 Targeted Dnazymes on Cell Proliferation And Cancer Gene Therapy (2005) 12, 647–654 r 2005 Nature Publishing Group All rights reserved 0929-1903/05 $30.00 www.nature.com/cgt Effect of EBV LMP1 targeted DNAzymes on cell proliferation and apoptosis Zhong-Xin Lu,1 Mao Ye,1 Guang-Rong Yan,1 Qun Li,1 Min Tang,1 Leo M Lee,2 Lun-Quan Sun,3 and Ya Cao1 1Cancer Research Institute, Xiangya School of Medicine, Central South University, Changsha, China; 2Laboratory of Molecular Technology SAIC-Frederick, National Cancer Institute, Frederick, Maryland, USA; and 3St Vincent’s Clinical School, Faculty of Medicine, The University of New South Wales, Sydney, Australia. The latent membrane protein (LMP1) encoded by Epstein–Barr virus (EBV) has been suggested to be one of the major oncogenic factors in EBV-mediated carcinogenesis. RNA-cleaving DNA enzymes are catalytic nucleic acids that bind and cleave a target RNA in a highly sequence-specific manner. In this study, we explore the potential of using DNAzymes as a therapeutic approach to EBV- associated carcinomas by targeting the LMP1 gene. In all, 13 different phosphorothioate-modified ‘‘10–23’’ deoxyribozymes (DNAzymes) were designed and synthesized against the LMP1 mRNA and transfected into B95-8 cells, which constitutively express the LMP1. Fluorescence microscopy was used to examine the cellular uptake and distribution in B95-8 cells. As demonstrated in Western blots, three out of 13 deoxyribozymes significantly downregulated the expression of LMP1 in B95-8 cells. These DNAzymes were shown to markedly inhibit B95-8 cell growth compared with a disabled DNAzyme and untreated controls, as determined by an alamarBlue Assay. It was further demonstrated that these DNAzymes arrested the B95-8 cells in G0/G1 using flow cytometry. Interestingly, the active DNAzymes could also downregulate the expression of Bcl-2 gene in treated cells, suggesting a close association between the LMP1 and Bcl-2 genes and their involvement in apoptosis. This was further confirmed with the result that the DNAzymes could induce the release of cytochrome c from mitochondria, which is the hallmark of the apoptosis. The present results suggest that the LMP1 may present a potential target for DNAzymes towards the EBV-associated carcinoma through cell proliferation and apoptosis pathways. Cancer Gene Therapy (2005) 12, 647–654. doi:10.1038/sj.cgt.7700833 Published online 1 April 2005 Keywords: latent membrane protein; DNAzymes; EBV-associated carcinoma; targeted suppression pstein–Barr virus (EBV) is a gamma herpesvirus role in a varietyof human epithelial cancers and possibly Einfecting more than 90% of adults worldwide and is also in hyperplasias and certain dysplasias preceding the first human virus identified to be associated with carcinomas. human cancers.1 EBV has been implicated in the Latent membrane protein 1 (LMP1) is considered as pathogenesis of several human malignancies including a major oncogenic protein encoded byEBV because lymphoproliferative malignancies such as Burkitt’s and it could transform rodent fibroblasts and was tumorigenic Hodgkin’s lymphomas as well as epithelial tumors, in the nude mice.4 LMP1 is an integral membrane protein including nasopharyngeal carcinoma (NPC) and gastric composed of a short cytoplasmic N-terminus of 24 amino carcinoma.2 More recently, there have been scattered acids, six transmembrane domains of 162 amino acids reports linking EBV with typical epithelial cancers of and a cytoplasmic C-terminus of 200 amino acids. The other primarysites including breast, lung, colon and six hydrophobic transmembrane domains facilitate prostate carcinomas.3 These studies suggested that EBV, spontaneous self-oligomerization and create a complex rather than being associated with restricted groups of that constitutivelyactivates cell-signaling pathways uncommon malignancies, might in fact playan oncogenic via a cytoplasmic C-terminus that mimics tumor necrosis factor (TNF) receptor superfamilymembers. While the C-terminal activating region 1 (CTAR1) of LMP1 is Received September 23, 2004. located proximal to the membrane and binds to the Address correspondence and reprint requests to: Dr Lun-Quan Sun, Faculty of Medicine, University of New South Wales, Sydney, TNF receptor-associated factors (TRAFs), the CTAR2 Australia. E-mail: [email protected] or Professor Ya Cao, is located toward the far C-terminus of LMP1 and Cancer Research Institute, Xiangya School of Medicine, Central binds the TNF receptor-associated death domain protein South University, Changsha, Hunan, 410078, PR China. (TRADD) and receptor-interacting protein (RIP). E-mail: [email protected] Consequently, LMP1 can trigger several signaling DNAzyme-mediated suppression of LMP1 expression Z-X Lu et al 648 pathways that lead to the activation of several transcrip- Design and construction of DNAzymes tion factors, including NF-kB, STATs and AP-1.5–7 EBV has been shown to possess some mutations in LMP1 Activation of NF-kB or AP-1 byLMP1 has been linked and these sequence changes maybe associated with the to the upregulation of some cellular proteins and viral oncogenic potential. In order to identifysome inhibition of apoptosis. Depending on the cell types, conserved regions in the LMP1 gene for DNAzyme expression of LMP1 has been shown to playdifferent targeting, we aligned the LMP1 sequences from B95-8 roles in response to biological and physiological stimulus. cells with a panel of eight EBV isolates, including For example, the LMP1 expression was essential in the representatives of four defined groups of European immortalization of the EBV-infected B cells, and in LMP1 variants (groups A–D) and Chinese NPC-derived human epithelial cells LMP1 was suggested to be involved LMP1.18 All DNAzymes contained the 10–23 catalytic in tumor progression and invasions. More significantly, motif (ggctagctacaacga) and 9 bp hybridizing arms LMP1 is expressed in the majorityof EBV-associated specific for RU cleavage sites (R ¼ G or A) in the human malignancies, which supports the notion that the conserved regions of the LMP1 transcript. DNAzymes LMP1 maybe one of the keyfactors contributing to 8 were selected in the studyif their hybridizationstability EBV-mediated tumorigenesis. Therefore, genetic manip- 19 with their targets (D G1)is À25 kcal/mol. Based on ulation of the LMP1 expression mayprovide a novel o the analyses of sequences, thermodynamics and site strategyfor the treatment of EBV-associated human distribution within the LMP1 gene, 13 DNAzymes were cancers. synthesized with two phosphorothioate linkages on both Currently, there are several commonly used technologies arms (Table 1). The control oligonucleotide of DZ10 was for gene suppression, which include antisense oligonucleo- designed byinverting catalyticcore sequence. Where tides, ribozymes, DNAzymes and RNA interference indicated, DZ10 DNAzyme was labeled with a fluorescein (RNAi). The relative merits of antisense, RNAi, ribozymes isothiocyanate (FITC) at the 50-end for cellular uptake and DNAzymes for sequence-specific knockdown of target study. RNA in different situations were recentlycompared by Scherer and Rossi.9 DNAzymes are synthetic, single- stranded DNA catalysts that can be engineered to bind DNAzyme transfection of B95-8 cells to their complementarysequence in a target messenger Cells were split the daybefore transfection. On the dayof RNA (mRNA) through Watson–Crick base pairing.10 A transfection, cells were harvested and washed once with general model for the DNAzyme has been proposed, and is cold PBS. 2 Â 106 cells per well were seeded in a six-well known as the ‘‘10–23’’ model. DNAzymes following the plate in 1 ml of fresh RPMI 1640 medium containing 10% ‘‘10–23’’ model, also referred to simplyas ‘‘10–23 FBS. The DNAzymes/tetra(4-methylpyridyl) porphyrine DNAzymes’’, have a catalytic domain of 15 deoxyribonu- (TMP) mixtures were made at a charge ratio of 1 with cleotides, flanked bytwo substrate-recognition domains of 2 mM DNAzyme oligonucleotides as described.20 The seven to nine deoxyribonucleotides each. In vitro analyses mixture was then added to the cells and incubated at 371C show that this type of DNAzyme can effectively cleave its for 4 hours, followed bythe addition of complete medium substrate RNA at purine:pyrimidine junctions under to the wells and further incubation for 20 hours. physiological conditions.11 These agents have been used in a number of in vitro and in vivo applications to inhibit Fluorescence microscopic analysis the expression of their target gene12 and their dependent At 20 hours after transfection, cells were rinsed twice with genes.13 Their capacityto block development of a diverse PBS, once with 2 ml of .2 M glycine (pH 2.8) buffer, and range of pathologies in animal models suggests a potential then once with PBS. Cell nuclei were stained with 5 ng/ml use of DNAzymes as therapeutic tools.12–17 Hoescht 33258 or 50 ng/ml PI in PBS for 5 minutes prior In this report, we designed and constructed the specific to fixing with 4% paraformaldehyde in PBS for 30 DNAzymes that were shown to be effective in suppressing minutes at ambient temperature.21 Cells were rinsed with expression of the target protein LMP1 and affecting some PBS and then mounted in 75% glycerol. Microphoto- LMP1-associated biological pathways. These results graphs were acquired under UV (for Hoescht staining) demonstrated the feasibilityof targeting the LMP1 and B2 (for FITC-labeled DNAzymes) filters using a mRNA as a potential therapeutic strategyfor EBV- Nikon Optiphot-2 microscope (Tokyo, Japan)
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