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Porous Silicon Microparticles for Delivery of siRNA Therapeutics
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Hydroxychloroquine-conjugated gold nanoparticles for improved siRNA activity.

F Perche1, Y Yi1, L Hespel1

  • 1Department of Materials Engineering, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8856, Japan.

Biomaterials
|March 18, 2016
PubMed
Summary

Hydroxychloroquine conjugation enhances siRNA delivery by improving endosomal escape and RISC loading. This modification boosts gene silencing activity, offering a promising strategy for improved siRNA therapeutics.

Keywords:
Gold nanoparticlesHydroxychloroquineIntracellular bioavailabilitysiRNA delivery

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Area of Science:

  • Biotechnology
  • Nanomedicine
  • Molecular Biology

Background:

  • Current siRNA delivery methods focus on maximizing tumor dosage but neglect intracellular barriers.
  • Intracellular barriers, such as endosomal entrapment and inefficient guide strand loading into the RNA-induced silencing complex (RISC), limit siRNA efficacy.

Purpose of the Study:

  • To investigate the impact of hydroxychloroquine conjugation on the intracellular delivery and gene silencing activity of siRNA.
  • To determine if hydroxychloroquine improves endosomal escape and siRNA loading into RISC.

Main Methods:

  • siRNA was conjugated to PEGylated gold nanoparticles with and without hydroxychloroquine.
  • The intracellular fate, including endosomal escape and RISC loading, of the siRNA conjugates was analyzed.
  • Gene downregulation was assessed in cellulo.

Main Results:

  • Hydroxychloroquine conjugation significantly improved endosomal escape of siRNA.
  • Increased distribution of the siRNA guide strand to the RISC was observed with hydroxychloroquine modification.
  • This resulted in significantly enhanced gene downregulation in cells.

Conclusions:

  • Hydroxychloroquine conjugation is a viable strategy to overcome intracellular delivery bottlenecks for siRNA.
  • This approach enhances siRNA potency by improving endosomal escape and RISC loading.
  • The findings support the development of improved siRNA delivery systems utilizing hydroxychloroquine modification for enhanced therapeutic outcomes.