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Chitosan and Its Structural Modifications for siRNA Delivery.

Mona Y Al-Absi1, Anna Eleonora Caprifico1, Gianpiero Calabrese1

  • 1School of Life Sciences, Pharmacy and Chemistry, Kingston University London, Penrhyn Road, Kingston upon Thames, KT1 2EE, United Kingdom.

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Modified chitosan shows promise as an efficient carrier for small interfering RNA (siRNA) in cancer gene therapy. Chemical modifications enhance chitosan

Keywords:
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Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Gene Therapy

Background:

  • RNA interference (RNAi) using small interfering RNA (siRNA) is a potent strategy for cancer gene therapy.
  • Efficient delivery of intact siRNA into target cells is crucial for successful gene silencing.
  • Chitosan, a biodegradable polymer, is explored as a non-viral vector for siRNA delivery, but faces limitations like low transfection efficiency and solubility.

Purpose of the Study:

  • To review recent chemical modifications of chitosan aimed at improving its properties as an siRNA delivery vector.
  • To analyze the impact of these modifications on physicochemical properties, siRNA binding, and nanoparticle characteristics.
  • To evaluate the in vitro and in vivo performance of modified chitosan-based siRNA delivery systems.

Main Methods:

  • Literature review of recent chemical modifications applied to chitosan for siRNA delivery.
  • Discussion of the chemical structures and resulting physicochemical properties of modified chitosans.
  • Comparison of modified chitosan-based nanoparticles with unmodified chitosan in terms of complexation, cellular uptake, stability, cytotoxicity, and transfection efficiency.

Main Results:

  • Various chemical modifications have been investigated to overcome chitosan's limitations for siRNA delivery.
  • Modified chitosans exhibit altered physicochemical properties, influencing siRNA binding and nanoparticle formation.
  • Performance evaluations show significant improvements in cellular uptake, serum stability, and gene transfection efficiency for certain modified chitosan derivatives.

Conclusions:

  • Chemical modification of chitosan is essential for developing effective siRNA delivery systems for cancer gene therapy.
  • Specific modifications offer enhanced properties, leading to improved gene silencing efficacy.
  • Further critical analysis is needed to identify the most promising chitosan derivatives for future clinical applications.