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Assembly and Characterization of Polyelectrolyte Complex Micelles
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Structure-Property Relationships of Oligonucleotide Polyelectrolyte Complex Micelles.

Michael Lueckheide1, Jeffrey R Vieregg2, Alex J Bologna2

  • 1Department of Chemistry , University of Chicago , Chicago , Illinois 60637 , United States.

Nano Letters
|October 20, 2018
PubMed
Summary

Polyelectrolyte complex micelles (PCMs) can deliver nucleic acids. Nanoparticle shape depends on DNA structure: single-stranded DNA forms spheres, double-stranded DNA forms worms, aiding therapeutic delivery design.

Keywords:
Oligonucleotidescoacervationcomplexationnanoparticlesphase separationpolyelectrolytes

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Area of Science:

  • Nanotechnology
  • Polymer Science
  • Biophysics

Background:

  • Polyelectrolyte complex micelles (PCMs) are promising for nucleic acid delivery.
  • Limited understanding of structure-property relationships hinders PCM development.
  • Previous studies questioned the ability of rigid double-stranded nucleic acids to form PCMs.

Purpose of the Study:

  • Investigate structure-property relationships in PCMs.
  • Determine how DNA hybridization state and block copolymer length influence PCM morphology.
  • Establish rational design principles for nucleic acid delivery vehicles.

Main Methods:

  • Utilized small-angle X-ray scattering (SAXS), multiangle light scattering (MALS), and cryo-electron microscopy (cryo-TEM).
  • Characterized PCMs formed from DNA oligonucleotides (varied length and hybridization) and poly(l)lysine-poly(ethylene glycol) block copolymers.
  • Analyzed nanoparticle morphology and internal structure.

Main Results:

  • Nanoparticle shape is dictated by DNA hybridization: single-stranded DNA forms spheroidal micelles, while double-stranded DNA forms wormlike micelles.
  • The length of the charged polymer block controls nanoparticle radius.
  • Observed parallel packing of DNA helices within double-stranded PCMs.
  • Developed salt- and thermal-annealing protocols for reproducible PCM formation with low polydispersity.

Conclusions:

  • DNA hybridization state is the primary determinant of PCM shape.
  • Block copolymer length controls PCM size.
  • These findings enable rational design of PCMs for enhanced nucleic acid delivery.
  • The study provides a foundation for optimizing PCMs as therapeutic delivery systems.