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Related Concept Videos

Site-Targeted Drug Delivery Systems: Polymeric Carriers01:24

Site-Targeted Drug Delivery Systems: Polymeric Carriers

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...
siRNA - Small Interfering RNAs02:30

siRNA - Small Interfering RNAs

Small interfering RNAs, or siRNAs, are short regulatory RNA molecules that can silence genes post-transcriptionally, as well as the transcriptional level in some cases. siRNAs are important for protecting cells against viral infections and silencing transposable genetic elements.
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RNA interference (RNAi) is a cellular mechanism that inhibits gene expression by suppressing its transcription or activating the RNA degradation process. The mechanism was discovered by Andrew Fire and Craig Mello in 1998 in plants. Today, it is observed in almost all eukaryotes, including protozoa, flies, nematodes, insects, parasites, and mammals. This precise cellular mechanism of gene silencing has been developed into a technique that provides an efficient way to identify and determine the...
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Related Experiment Video

Updated: May 20, 2026

Porous Silicon Microparticles for Delivery of siRNA Therapeutics
08:31

Porous Silicon Microparticles for Delivery of siRNA Therapeutics

Published on: January 15, 2015

Recent progress in copolymer-mediated siRNA delivery.

Zong-Wei Wu1, Chih-Te Chien, Chia-Yeh Liu

  • 1Center for Nanomedicine Research, National Health Research Institutes, Zhunan, Taiwan.

Journal of Drug Targeting
|July 5, 2012
PubMed
Summary
This summary is machine-generated.

Copolymer-based vehicles show promise for delivering short interfering RNA (siRNA) to treat diseases. These advanced materials offer improved in vivo delivery compared to older methods.

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Last Updated: May 20, 2026

Porous Silicon Microparticles for Delivery of siRNA Therapeutics
08:31

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Published on: January 15, 2015

Preparation of Neutrally-charged, pH-responsive Polymeric Nanoparticles for Cytosolic siRNA Delivery
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Published on: May 2, 2019

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08:44

Assembly and Characterization of Polyelectrolyte Complex Micelles

Published on: March 2, 2020

Area of Science:

  • Biotechnology
  • Polymer Science
  • Gene Therapy

Background:

  • RNA interference (RNAi) uses short interfering RNA (siRNA) to silence disease-causing genes.
  • Developing effective in vivo siRNA delivery vehicles remains a significant challenge.
  • Copolymer-based vectors offer advantages over homopolymer vectors for siRNA delivery.

Purpose of the Study:

  • To review recent advancements in copolymer-mediated siRNA delivery systems.
  • To highlight essential components for effective siRNA delivery vehicles.
  • To provide insights into overcoming challenges for in vivo applications.

Main Methods:

  • Review of literature on copolymer-based siRNA delivery systems.
  • Analysis of essential building blocks: cationic segments, organelle-escape units, and degradable fragments.
  • Comparison of copolymer vs. homopolymer vector performance.

Main Results:

  • Copolymer vectors are less immunogenic and more efficient at cellular uptake than homopolymer vectors.
  • Cationic segments (e.g., polyamines) protect siRNA and aid endosomal escape.
  • Degradable fragments are crucial for releasing siRNA in the cytoplasm.

Conclusions:

  • Copolymer-based systems are a promising strategy for efficient in vitro and in vivo siRNA delivery.
  • Careful selection of building blocks is key to optimizing copolymer vehicle performance.
  • Further research into copolymer design can address current limitations in gene therapy delivery.