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Effect of North Bicyclo[3.1.0]hexane 2′-Deoxy-pseudosugars on RNA Interference: A Novel Class of siRNA Modification

Authors

  • Dr. Montserrat Terrazas,

    1. Institute for Research in Biomedicine (IRB Barcelona), CIBER-BBN, Institute for Advanced Chemistry of Catalonia (IQAC), Spanish Research Council (CSIC), Cluster Building, Baldiri i Reixac 10, 08028 Barcelona (Spain), Fax: (+34) 932045904
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  • Dr. Sandra M. Ocampo,

    1. Institute for Research in Biomedicine (IRB Barcelona), CIBER-BBN, Institute for Advanced Chemistry of Catalonia (IQAC), Spanish Research Council (CSIC), Cluster Building, Baldiri i Reixac 10, 08028 Barcelona (Spain), Fax: (+34) 932045904
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  • Dr. José Carlos Perales,

    1. Department of Ciències Fisiològiques, School of Medicine, University of Barcelona, Campus Bellvitge, C/Feixa Llarga, L'Hospitalet de Llobregat, 08907 Barcelona (Spain)
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  • Prof. Dr. Victor E. Marquez,

    1. Laboratory of Chemical Biology, Center for Cancer Research, National Cancer Institute at Frederick, Frederick, MD 21702 (USA)
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  • Dr. Ramon Eritja

    Corresponding author
    1. Institute for Research in Biomedicine (IRB Barcelona), CIBER-BBN, Institute for Advanced Chemistry of Catalonia (IQAC), Spanish Research Council (CSIC), Cluster Building, Baldiri i Reixac 10, 08028 Barcelona (Spain), Fax: (+34) 932045904
    • Institute for Research in Biomedicine (IRB Barcelona), CIBER-BBN, Institute for Advanced Chemistry of Catalonia (IQAC), Spanish Research Council (CSIC), Cluster Building, Baldiri i Reixac 10, 08028 Barcelona (Spain), Fax: (+34) 932045904
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Abstract

North bicyclo methanocarba thymidine (TN) nucleosides were substituted into siRNAs to investigate the effect of bicyclo[3.1.0]hexane 2′-deoxy-pseudosugars on RNA interference activity. Here we provide evidence that these modified siRNAs are compatible with the intracellular RNAi machinery. We studied the effect of the TN modification in a screen involving residue-specific changes in an siRNA targeting Renilla luciferase and we applied the most effective pattern of modification to the knockdown of murine tumor necrosis factor (TNF-α). We also showed that incorporation of TN units into siRNA duplexes increased their thermal stabilities, substantially enhanced serum stabilities, and decreased innate immunostimulation. Comparative RNAi studies involving the TN substitution and locked nucleic acids (LNAs) showed that the gene-silencing activities of TN-modified siRNAs were comparable to those obtained with the LNA modification. An advantage of the North 2′-deoxy-methanocarba modification is that it may be explored further in the future by changing the 2′-position. The results from these studies suggest that this modification might be valuable for the development of siRNAs for therapeutic applications.

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