Endothelial targeting of semi-permeable polymer nanocarriers for enzyme therapies

Thomas D. Dziubla, Vladimir V. Shuvaev, Nan Kang Hong, Brian J. Hawkins, Muniswamy Madesh, Hajime Takano, Eric Simone, Marian T. Nakada, Aron Fisher, Steven M. Albelda, Vladimir R. Muzykantov

Research output: Contribution to journalArticlepeer-review

106 Scopus citations


The medical utility of proteins, e.g. therapeutic enzymes, is greatly restricted by their labile nature and inadequate delivery. Most therapeutic enzymes do not accumulate in their targets and are inactivated by proteases. Targeting of enzymes encapsulated into substrate-permeable polymer nano-carriers (PNC) impermeable for proteases might overcome these limitations. To test this hypothesis, we designed endothelial targeted PNC loaded with catalase, an H2O2-detoxifying enzyme, and tested if this approach protects against vascular oxidative stress, a pathological process implicated in ischemia-reperfusion and other disease conditions. Encapsulation of catalase (MW 247 kD), peroxidase (MW 42 kD) and xanthine oxidase (XO, MW 300 kD) into ∼300 nm diameter PNC composed of co-polymers of polyethylene glycol and poly-lactic/poly-glycolic acid (PEG-PLGA) was in the range ∼10% for all enzymes. PNC/catalase and PNC/peroxidase were protected from external proteolysis and exerted enzymatic activity on their PNC diffusible substrates, H2O2 and ortho-phenylendiamine, whereas activity of encapsulated XO was negligible due to polymer impermeability to the substrate. PNC targeted to platelet-endothelial cell (EC) adhesion molecule-1 delivered active encapsulated catalase to ECs and protected the endothelium against oxidative stress in cell culture and animal studies. Vascular targeting of PNC-loaded detoxifying enzymes may find wide medical applications including management of oxidative stress and other toxicities.

Original languageEnglish
Pages (from-to)215-227
Number of pages13
Issue number2
StatePublished - Jan 2008

Bibliographical note

Funding Information:
Grant support: National Institutes of Health Grants NHLBI RO1 HL71175, HL078785 and HL73940 and Department of Defense Grant PR 012262 (VRM).


  • Antioxidant
  • Drug delivery
  • Enzyme
  • Nanoparticle
  • Polylactic acid

ASJC Scopus subject areas

  • Biophysics
  • Bioengineering
  • Ceramics and Composites
  • Biomaterials
  • Mechanics of Materials


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