alexa CNS delivery of vectored prion-specific single-chain antibodies delays disease onset.
General Science

General Science

Journal of Bioterrorism & Biodefense

Author(s): Wuertzer CA, Sullivan MA, Qiu X, Federoff HJ

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Abstract A unifying characteristic of prion diseases is the conversion of a normal cellular protein (PrP(c)) to an abnormal pathogenic conformation, designated PrP(sc). Antibodies directed against PrP(c), when added to scrapie-infected cell cultures or passively administered in vivo, can result in elimination of PrP(sc) or prevent its replication, respectively. In our efforts to develop an approach with potential prophylactic utility we employed a recombinant adeno-associated vector type 2 (rAAV2) viral vector platform to express PrP(c)-specific single-chain fragment variable (scFv) antibodies within the central nervous system (CNS) of susceptible mice that were subsequently inoculated peripherally with infectious prions. Vector expressed scFvs delayed onset of prion pathogenesis as evidenced by improvements in clinical signs and rotarod performance, in extended incubation periods, and in decreased PrP(sc) burden in the CNS. This novel antibody delivery platform enables the in vivo translation of prion prophylactics to other species afflicted by transmissible spongiform encephalopathies (TSEs) and which also has relevance to the development of therapeutics for other protein-misfolding diseases such as Alzheimer's or Parkinson's disease. This article was published in Mol Ther and referenced in Journal of Bioterrorism & Biodefense

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