A temporal gene delivery system based on fibrin microspheres

Mol Pharm. 2011 Apr 4;8(2):439-46. doi: 10.1021/mp100295z. Epub 2011 Jan 12.

Abstract

Combining complementary nonviral gene delivery vehicles such as tissue engineering scaffolds and liposomes not only is a promising avenue for development of safe and effective gene delivery system but also provides an opportunity to design dynamic extended release systems with spatiotemporal control. However, the DNA loading capacity of scaffolds such as fibrin is limited. Fibrin microspheres carrying DNA complexes can be utilized to extend the capacity of fibrin scaffold. Here, in a proof of concept study, the feasibility of fibrin microspheres for extending gene delivery capacity is described. Toward this goal, fibrin microspheres encapsulating lipoplexes were fabricated. The structural and functional integrity of DNA was assessed respectively by gel electrophoresis and an in vivo pilot study, using endothelial nitric oxide synthase (eNOS) as a model therapeutic gene in a rabbit ear ulcer model of compromised wound healing. The results confirmed structural integrity and successful delivery and functional integrity, assessed qualitatively by angiogenic effect of eNOS. Finally, as a step toward development of a "fibrin in fibrin" temporal release system, fibrin microspheres were shown to degrade and release DNA differentially compared to fibrin scaffold. It can thus be concluded that fibrin microspheres can be utilized for gene delivery to extend the capacity of a fibrin scaffold and can form a component of a "fibrin in fibrin" temporal release system.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Alloxan / toxicity
  • Animals
  • Blotting, Western
  • DNA / administration & dosage
  • Ear / pathology
  • Fibrin / chemistry*
  • Gene Transfer Techniques*
  • Genetic Therapy*
  • Genetic Vectors / administration & dosage
  • Immunoenzyme Techniques
  • Mice
  • Mice, Obese
  • Microspheres
  • Nitric Oxide / metabolism
  • Nitric Oxide Synthase Type III / genetics*
  • Nitric Oxide Synthase Type III / metabolism
  • RNA, Messenger / genetics
  • Rabbits
  • Reverse Transcriptase Polymerase Chain Reaction
  • Ulcer / genetics
  • Ulcer / pathology
  • Ulcer / therapy*
  • Wound Healing / physiology*

Substances

  • RNA, Messenger
  • Nitric Oxide
  • Alloxan
  • Fibrin
  • DNA
  • Nitric Oxide Synthase Type III