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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: Mar 27, 2026

Predicting Gene Silencing Through the Spatiotemporal Control of siRNA Release from Photo-responsive Polymeric Nanocarriers
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Temperature-Responsive Gene Silencing by a Smart Polymer.

Mingming Wang1, Yiyun Cheng1

  • 1Shanghai Key Laboratory of Regulatory Biology, School of Life Sciences, East China Normal University , Shanghai, 200241, P.R. China.

Bioconjugate Chemistry
|January 20, 2016
PubMed
Summary

This study introduces a temperature-responsive polymer for controlled intracellular siRNA release and gene silencing. Cooling triggers siRNA release, enhancing gene silencing efficacy with minimal cell toxicity.

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Molecular Biology

Background:

  • Efficient intracellular delivery of small interfering RNA (siRNA) is essential for gene silencing therapies.
  • Cationic polymers are widely used for siRNA delivery, but controlled release remains a challenge.

Purpose of the Study:

  • To develop a stimuli-responsive polymer system for triggered intracellular siRNA release.
  • To investigate the efficacy and safety of temperature-induced gene silencing using this novel polymer.

Main Methods:

  • Synthesis of a temperature-responsive polymer incorporating dendrimer, poly(N-isopropylacrylamide), and phenylboronic acid.
  • Loading of siRNA into the polymer and assessment of temperature-triggered release below the polymer's lower critical solution temperature.
  • Evaluation of gene silencing efficacy and cellular toxicity in transfected cells following cool treatment.

Main Results:

  • The synthesized polymer successfully encapsulated and released siRNA in a temperature-dependent manner.
  • Gene silencing efficiency was significantly enhanced by cooling the cells after polymer uptake.
  • The polymer and cooling treatment exhibited minimal toxicity to the transfected cells.

Conclusions:

  • A facile and promising strategy for stimuli-responsive polymer design for enhanced gene silencing was demonstrated.
  • Temperature-triggered intracellular siRNA release offers a controlled approach for gene silencing applications.
  • This approach holds potential for developing safer and more effective gene therapy vectors.