Abstract
Delivery of siRNAs to blood cells is one of the most difficult tasks since there are no efficient and nontoxic methods of delivering nucleic acids to these cells in vivo. Conjugation of siRNAs with targeting or lipophilic transport molecules is one of the most promising approaches to solving this problem, since it can provide efficient accumulation without toxic side effects. Therefore, in this work, we conjugated an siRNA molecule with lipophilic molecules for its delivery to PBMC (primary blood mononuclear cells) and whole blood cells. We showed that among the studied molecules, cholesterol is the most promising agent for this purpose. Further screening of conjugates with respect to the length of the linker connecting the siRNA and cholesterol showed that a linker containing six carbon atoms is optimal for the most efficient delivery of the siRNA into human cells in experiments in whole blood. The selected siRNA–cholesterol conjugate also efficiently accumulated in mouse blood cells and splenocytes upon intravenous injection.
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The work was supported by the Russian Science Foundation (project no. 19-04-00251) and the Program of Fundamental Research of State Academies of Sciences 2013–2020, project no. AAAA-A17-117020210024-8.
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Experiments on animals were carried out in accordance with the protocol approved by the Inter-Institutional Commission on Bioethics of the Siberian Branch of the Russian Academy of Sciences (Protocol No. 22.11 dated May 30, 2014) and recommendations for the proper use and care of laboratory animals (European Communities Council Directive 86/609 / CEE).
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Translated by N. Onishchenko
Abbreviations: A, Alexa Fluor-488; Ch, cholesterol; F, fluorescein; Lf, Lipofectamine; Lt, lithocholic acid, PBMC, primary blood mononuclear cells; siRNA, small interfering RNA; Toco, α-tocopherol.
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Chernikov, I.V., Meschaninova, M.I., Gladkikh, D.V. et al. Interaction of Lipophilic Conjugates of Modified siRNAs with Hematopoietic Cells In Vitro and In Vivo. Russ J Bioorg Chem 47, 399–410 (2021). https://doi.org/10.1134/S1068162021020072
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DOI: https://doi.org/10.1134/S1068162021020072