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- W1988286727 abstract "It is often believed that small interfering RNA (siRNA) is at least 10-fold more effective than the single-stranded antisense oligonucleotide for silencing the same target gene in the same cells. In view of the recent discovery that the RNA-induced silencing complex (RISC) contains only a single-stranded RNA (ssRNA) molecule and can be reconstituted using single-stranded antisense RNA, such a large difference in efficacy seems puzzling. One possible reason is that hybridization protects siRNA from hydrolysis by endogenous RNase activity until it is incorporated in the RISC, whereas ssRNA is rapidly hydrolyzed. Because the single-stranded poly-2′-O-(2,4-dinitrophenyl)-RNA (DNP-ssRNA) is both RNase resistant and membrane permeable, we synthesized homologous native siRNAs, DNP-siRNAs, native ssRNAs, and DNP-ssRNAs and made a comparative study of their efficacies for inhibiting the growth of two cancer cell lines with different overexpressed target genes under equivalent experimental conditions. It was found that the efficacy of antisense DNP-ssRNA is higher than that of the corresponding siRNA and that the efficacy of native siRNA for inhibiting cell growth can also be enhanced from 2-fold to 6-fold by replacing the native strands of RNA in siRNA with homologous DNP-RNA. Thermal denaturation data show that the hybridization affinity of the DNP-RNA/RNA duplex is higher than that of the native RNA/RNA duplex. Western blotting analysis of A549 cells treated with antisense DNP-ssRNAs containing single mismatching bases shows that the gene silencing by antisense DNP-ssRNA is as sequence specific as that by siRNA. The observed large enhancement of inhibition efficacy of native RNAs by DNP derivatization should be advantageous for both gene silencing studies and therapeutic applications." @default.
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- W1988286727 date "2004-04-01" @default.
- W1988286727 modified "2023-10-03" @default.
- W1988286727 title "Poly-2′-DNP-RNAs with Enhanced Efficacy for Inhibiting Cancer Cell Growth" @default.
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- W1988286727 doi "https://doi.org/10.1089/1545457041526326" @default.
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