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Related Concept Videos

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Polymeric carriers enhance targeted drug delivery by increasing efficacy while minimizing off-target effects. These carriers comprise a biodegradable polymeric backbone integrated with functional elements that enable targeting, improve physicochemical properties, and regulate drug release.Targeting MechanismsThe targeting ability of polymeric carriers is mediated by a homing device, which is a molecular recognition component designed to selectively bind to specific tissues or cells. Monoclonal...
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Preparation of Neutrally-charged, pH-responsive Polymeric Nanoparticles for Cytosolic siRNA Delivery
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Published on: May 2, 2019

Nanosized multifunctional polyplexes for receptor-mediated siRNA delivery.

Christian Dohmen1, Daniel Edinger, Thomas Fröhlich

  • 1Pharmaceutical Biotechnology, Center for NanoScience, Ludwig-Maximilians-University Munich, Butenandtstrasse 5-13, 81377 Munich, Germany.

ACS Nano
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Summary

Researchers developed a novel nanocarrier system for targeted delivery of small interfering RNA (siRNA) therapeutics. This system demonstrates efficient gene silencing in vivo with enhanced safety and reduced off-target effects.

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Area of Science:

  • Biotechnology
  • Nanomedicine
  • Molecular Biology

Background:

  • RNA interference (RNAi) therapeutics, particularly small interfering RNA (siRNA), show great promise but face significant challenges in targeted delivery.
  • Developing safe, effective, and precisely engineered carrier molecules for siRNA is crucial for therapeutic advancement.

Purpose of the Study:

  • To develop and characterize a monodisperse, multifunctional nanocarrier system for efficient and targeted siRNA delivery.
  • To evaluate the in vitro and in vivo performance of the developed siRNA delivery system.

Main Methods:

  • Solid-phase supported chemistry was employed to synthesize a sequence-defined carrier with a cationic core, bioreversible cysteines, polyethylene glycol (PEG) chain, and folic acid targeting ligand.
  • Nanosized polyplexes were formed by complexing the carrier with an endosomolytic peptide-siRNA conjugate.
  • In vitro and in vivo studies assessed gene silencing efficacy, cell targeting specificity, particle stability, biodistribution, and tolerability.

Main Results:

  • The multifunctional nanocarrier system successfully formed functional polyplexes with a controlled hydrodynamic diameter (6 nm).
  • Each component of the carrier system was essential for specific and efficient gene silencing.
  • In vivo studies confirmed stability, receptor-specific targeting, effective EG5 gene silencing in tumors, good tolerability, and efficient renal clearance without accumulation in major organs.

Conclusions:

  • The developed nanocarrier system provides a precise and multifunctional platform for targeted siRNA delivery.
  • The system's design enables controlled particle size, enhanced stability, specific cell targeting, and efficient gene silencing with an improved safety profile.