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Assembly and Characterization of Polyelectrolyte Complex Micelles
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Published on: March 2, 2020

Tocopheryl oligochitosan-based self assembling oligomersomes for siRNA delivery.

Sang Myoung Noh1, Su Eun Han, Gayong Shim

  • 1College of Pharmacy, Seoul National University, Seoul, South Korea.

Biomaterials
|October 8, 2010
PubMed
Summary

Novel tocopherol oligochitosan conjugates self-assemble into size-controllable oligomersomes (TCOsomes) for enhanced siRNA delivery. TCOsomes significantly improved cellular uptake and in vivo tumor suppression, outperforming commercial lipofectamine.

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Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Drug Delivery

Background:

  • Oligochitosans are water-soluble biopolymers with potential biomedical applications.
  • Alpha-tocopherol (vitamin E) possesses antioxidant and cell-penetrating properties.
  • Developing effective and safe delivery systems for small interfering RNA (siRNA) is crucial for gene therapy.

Purpose of the Study:

  • To construct amphiphilic alpha-tocopherol oligochitosan conjugates.
  • To investigate the self-assembly of these conjugates into size-controllable oligomersomes (TCOsomes).
  • To evaluate the efficacy of TCOsomes as a delivery vehicle for siRNA in vitro and in vivo.

Main Methods:

  • Synthesis of alpha-tocopherol succinate-conjugated oligochitosans with varying molecular weights.
  • Characterization of TCOsomes using dynamic light scattering and cryo-transmission electron microscopy (Cryo-TEM).
  • Assessment of siRNA complexation, cellular uptake, protein expression inhibition, and in vivo anti-tumor activity.

Main Results:

  • TOCsomes formed stable, unilamellar structures with controllable sizes (220-377 nm) and low polydispersity.
  • siRNA complexation led to TCOsome layer thickening and reduced zeta potential.
  • TCOsome(4K) demonstrated >98% siRNA cellular uptake, superior protein silencing, and significant tumor growth inhibition in mice.
  • Histological analysis confirmed apoptosis in tumor tissues treated with siMcl-1/TCOsome(4K).

Conclusions:

  • Alpha-tocopherol oligochitosan conjugates self-assemble into tunable oligomersomes suitable for siRNA delivery.
  • TCOsomes offer enhanced cellular uptake and potent in vivo gene silencing capabilities.
  • These self-assembling oligomersomes represent a promising platform for effective in vivo siRNA delivery and cancer therapy.