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Delivering DNA from photocrosslinked, surface eroding polyanhydrides.

Deborah J Quick1, Kelly K Macdonald, Kristi S Anseth

  • 1Department of Chemical and Biological Engineering, University of Colorado, ECCH 111, UCB 424, Boulder, CO 80309, USA.

Journal of Controlled Release : Official Journal of the Controlled Release Society
|June 16, 2004
PubMed
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This study developed photocrosslinked polyanhydride matrices for sustained DNA delivery in gene therapy. Encapsulating DNA in alginate microparticles significantly improved recovery and maintained DNA integrity.

Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Gene Therapy Delivery

Background:

  • Sustained DNA delivery is crucial for long-term gene therapy.
  • Controlling DNA release profiles from polymer matrices can be challenging due to DNA's high molecular weight.

Purpose of the Study:

  • To develop photocrosslinked polyanhydride matrices for controlled DNA release.
  • To enhance DNA recovery and integrity during release from these matrices.

Main Methods:

  • Photocrosslinking of multifunctional anhydride monomers to create hydrophobic, surface-eroding polymer networks.
  • Investigating plasmid DNA release from polyanhydride matrices.
  • Utilizing alginate microparticles for pre-encapsulation of DNA to improve recovery.

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Main Results:

  • Surface-eroding polyanhydride matrices demonstrated sustained DNA release.
  • Initial DNA recovery from polyanhydride matrices was low (~25%), with a decrease in supercoiled DNA over time.
  • Pre-encapsulation of DNA in alginate microparticles significantly improved DNA recovery and integrity.

Conclusions:

  • Photocrosslinked polyanhydrides offer predictable drug release profiles independent of molecule size.
  • Alginate microparticle encapsulation is an effective strategy to enhance DNA recovery and protect DNA integrity.
  • These polyanhydride matrices hold potential for biomaterial applications requiring structural support and controlled drug release.