Development of Guanidinium-Rich Protein Mimics for Efficient siRNA Delivery into Human T Cells

Biomacromolecules
Brittany M deRondeGregory N Tew

Abstract

RNA interference is gaining attention as a means to explore new molecular pathways and for its potential as a therapeutic; however, its application in immortal and primary T cells is limited due to challenges with efficient delivery in these cell types. Herein, we report the development of guanidinium-rich protein transduction domain mimics (PTDMs) based on a ring-opening metathesis polymerization scaffold that delivers siRNA into Jurkat T cells and human peripheral blood mononuclear cells (hPBMCs). Homopolymer and block copolymer PTDMs with varying numbers of guanidinium moieties were designed and tested to assess the effect cationic charge content and the addition of a segregated, hydrophobic block had on siRNA internalization and delivery. Internalization of fluorescently labeled siRNA into Jurkat T cells illustrates that the optimal cationic charge content, 40 charges per polymer, leads to higher efficiencies, with block copolymers outperforming their homopolymer counterparts. PTDMs also outperformed commercial reagents commonly used for siRNA delivery applications. Select PTDM candidates were further screened to assess the role the PTDM structure has on the delivery of biologically active siRNA into primary cells. Specific...Continue Reading

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Citations

Jul 5, 2016·Macromolecules·Andrea S CarliniNathan C Gianneschi
Apr 4, 2017·Chemistry : a European Journal·Joel M SarapasGregory N Tew
Mar 23, 2019·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Enping HongMarina A Dobrovolskaia
Jun 13, 2018·Proceedings of the National Academy of Sciences of the United States of America·Colin J McKinlayPaul A Wender
Apr 10, 2019·Polymers·Nicholas D Posey, Gregory N Tew
Sep 8, 2016·Biomacromolecules·Leah M CaffreyGregory N Tew
May 17, 2019·Molecular Pharmaceutics·Coralie M BacklundThomas L Andresen

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