Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
2009-6-29
pubmed:abstractText
The lack of a crucial metabolic enzyme can lead to accumulating substrate concentrations in the bloodstream and severe human enzyme deficiency diseases. Mitochondrial Neurogastrointestinal Encephalomyopathy (MNGIE) is such a fatal genetic disorder, caused by a thymidine phosphorylase deficiency. Enzyme replacement therapy is a strategy where the deficient enzyme is administered intravenously in order to decrease the toxic substrate concentrations. Such a therapy is however not very efficient due to the fast elimination of the native enzyme from the circulation. In this study we evaluate the potential of using polymeric enzyme-loaded nanoparticles to improve the delivery of therapeutic enzymes. We constructed new 200-nanometer PMOXA-PDMS-PMOXA polymeric nanoparticles that encapsulate the enzyme thymidine phosphorylase. These particles are permeabilised for substrates and products by the reconstitution of the nucleoside-specific porin Tsx in their polymeric wall. We show that the obtained 'nanoreactors' are enzymatically active and stable in blood serum at 37 degrees C. Moreover, they do not provoke cytotoxicity when incubated with hepatocytes for 4 days, nor do they induce a macrophage-mediated inflammatory response ex vivo and in vivo. All data highlight the potential of such nanoreactors for their application in enzyme replacement therapy of MNGIE.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Aug
pubmed:issn
1873-4995
pubmed:author
pubmed:issnType
Electronic
pubmed:day
4
pubmed:volume
137
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
246-54
pubmed:meshHeading
pubmed-meshheading:19371766-Animals, pubmed-meshheading:19371766-Bacterial Outer Membrane Proteins, pubmed-meshheading:19371766-Cell Survival, pubmed-meshheading:19371766-Cells, Cultured, pubmed-meshheading:19371766-Escherichia coli, pubmed-meshheading:19371766-Escherichia coli Proteins, pubmed-meshheading:19371766-Hepatocytes, pubmed-meshheading:19371766-L-Lactate Dehydrogenase, pubmed-meshheading:19371766-Macrophages, pubmed-meshheading:19371766-Male, pubmed-meshheading:19371766-Mice, pubmed-meshheading:19371766-Mice, Inbred C57BL, pubmed-meshheading:19371766-Nanoparticles, pubmed-meshheading:19371766-Oxazoles, pubmed-meshheading:19371766-Particle Size, pubmed-meshheading:19371766-Polymers, pubmed-meshheading:19371766-Rats, pubmed-meshheading:19371766-Rats, Sprague-Dawley, pubmed-meshheading:19371766-Receptors, Virus, pubmed-meshheading:19371766-Thymidine Phosphorylase
pubmed:year
2009
pubmed:articleTitle
Assessment of stability, toxicity and immunogenicity of new polymeric nanoreactors for use in enzyme replacement therapy of MNGIE.
pubmed:affiliation
Structural Biology Brussels, Vrije Universiteit Brussel (VUB), 1050 Brussels (Elsene), Belgium. Caroline.De.Vocht@vub.ac.be
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't