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- W2029447286 abstract "Oncogene‐specific downregulation mediated by RNA interference (RNAi) is a promising avenue for cancer therapy. In addition to specific gene silencing, in vivo RNAi treatment with short interfering RNAs (siRNAs) can initiate immune activation through innate immune receptors including Toll‐like receptors, (TLRs) 7 and 8. Two recent studies have shown that activation of innate immunity by addition of tri‐phosphate motifs to oncogene‐specific siRNAs, or by co‐treatment with CpG oligos, can potentiate siRNA antitumor effects. To date, there are no reports on applying such approach against human papillomavirus (HPV)‐driven cancers. Here, we characterized the antitumor effects of non‐modified siRNAs that can target a specific oncogene and/or recruit the innate immune system against HPV‐driven tumors. Following the characterization of silencing efficacy and TLR7 immunostimulatory potential of 15 siRNAs targeting the HPV type 16 E6/E7 oncogenes, we identified a bifunctional siRNA sequence that displayed both potent gene silencing and active immunostimulation effect. In vivo systemic administration of this siRNA resulted in reduced growth of established TC‐1 tumors in C57BL/6 mice. Ablation of TLR7 recruitment via 2′O‐methyl modification of the oligo backbone reduced these antitumor effects. Further, a highly immunostimulatory, but non‐HPV targeting siRNA was also able to exert antitumoral effects although for less prolonged time compared with the bifunctional siRNA. Collectively, our work demonstrates for the first time that siRNA‐induced immunostimulation can have antitumoral effects against HPV‐driven tumors in vivo , even independent of gene silencing efficacy." @default.
- W2029447286 created "2016-06-24" @default.
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- W2029447286 date "2011-03-22" @default.
- W2029447286 modified "2023-10-17" @default.
- W2029447286 title "siRNA‐induced immunostimulation through TLR7 promotes antitumoral activity against HPV‐driven tumors <i>in vivo</i>" @default.
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- W2029447286 doi "https://doi.org/10.1038/icb.2011.19" @default.
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