Polymer Brush-Stabilized Polyplex for a siRNA Carrier with Long Blood Circulatory Half-Life

Arihiro Kano; Takeshi Yamano; Sun Won Choi; Atsushi Maruyama

doi:10.4028/www.scientific.net/AMR.47-50.762

Paper Titles

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A Kinetic Study on the Electrodeposition of Ni-Cr Alloy on Copper for Embedded Resister Layer in PCB
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Characteristics of Silver Electrodeposition Solution and Silver Film Fabricated by Electrodeposition with Additives for Interconnection
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Polymer Brush-Stabilized Polyplex for a siRNA Carrier with Long Blood Circulatory Half-Life
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Preparation and Characterization of Polyurethane/Multi-Walled Carbon Nanotubes Composites with Multi Functional Performance
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Development of an Ultra-Small Smart Temperature Sensor with Quartz Tuning Fork Resonators
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Prediction of Inelastic Behavior of Composite Laminates Using Multi-Surface Continuum Damage-Plasticity
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Real 3D Crack-Front and Crack Trajectory Analyses of Single-Side Repaired Thick Aluminium Panels
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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 47-50Polymer Brush-Stabilized Polyplex for a siRNA...

Polymer Brush-Stabilized Polyplex for a siRNA Carrier with Long Blood Circulatory Half-Life

Abstract:

Small interfering RNA (siRNA) holds potential as a therapeutic approach to silence targeted gene of disease, but siRNA has limited stability in vivo. Therefore, delivery system of siRNA is the key to siRNA therapeutic application. We attempted to develop a delivery system, which enables siRNA to demonstrate high stability and long blood circulation. We synthesized a series of bottlebrush-type copolymers (BBCs) possessing polycationic backbone (less than 30 wt%) and abundant water-soluble side chains (more than 70 wt%) as siRNA carrier. A siRNA complexed with the BBC was resistant to nuclease and stable in plasma. Especially, the BBC (10 wt% PLL and 90 wt% PEG) having higher grafting ratio (≈ 90 wt%) of water-soluble side chains showed 100-times enhanced stability of siRNA in mouse bloodstream in vivo. Surprisingly, even when the BBC and siRNA separately injected into mouse at 20 min interval, the BBC increased blood half life of the siRNA. These results suggest that the BBC has higher selectivity in its ionic interaction to siRNA than other anionic substance in blood components. To our knowledge, this is the first report of siRNA delivery carrier which prolonged blood circulation of siRNA without resource-consuming preparation process.