Long-term correction of Sandhoff disease following intravenous delivery of rAAV9 to mouse neonates

Jagdeep S. Walia, Naderah Altaleb, Alexander Bello, Christa Kruck, Matthew C. LaFave, Gaurav K. Varshney, Shawn M. Burgess, Biswajit Chowdhury, David Hurlbut, Richard Hemming, Gary P. Kobinger, Barbara Triggs-Raine

Research output: Contribution to journalArticlepeer-review

52 Scopus citations

Abstract

GM2 gangliosidoses are severe neurodegenerative disorders resulting from a deficiency in β-hexosaminidase A activity and lacking effective therapies. Using a Sandhoff disease (SD) mouse model (Hexb-/-) of the GM2 gangliosidoses, we tested the potential of systemically delivered adeno-associated virus 9 (AAV9) expressing Hexb cDNA to correct the neurological phenotype. Neonatal or adult SD and normal mice were intravenously injected with AAV9-HexB or -LacZ and monitored for serum β-hexosaminidase activity, motor function, and survival. Brain GM2 ganglioside, β-hexosaminidase activity, and inflammation were assessed at experimental week 43, or an earlier humane end point. SD mice injected with AAV9-LacZ died by 17 weeks of age, whereas all neonatal AAV9-HexB-treated SD mice survived until 43 weeks (P < 0.0001) with only three exhibiting neurological dysfunction. SD mice treated as adults with AAV9-HexB died between 17 and 35 weeks. Neonatal SD-HexB-treated mice had a significant increase in brain β-hexosaminidase activity, and a reduction in GM2 ganglioside storage and neuroinflammation compared to adult SD-HexB- and SD-LacZ-treated groups. However, at 43 weeks, 8 of 10 neonatal-HexB injected control and SD mice exhibited liver or lung tumors. This study demonstrates the potential for long-term correction of SD and other GM2 gangliosidoses through early rAAV9 based systemic gene therapy.

Original languageEnglish (US)
Pages (from-to)414-422
Number of pages9
JournalMolecular Therapy
Volume23
Issue number3
DOIs
StatePublished - Mar 5 2015
Externally publishedYes

ASJC Scopus subject areas

  • Molecular Medicine
  • Molecular Biology
  • Genetics
  • Pharmacology
  • Drug Discovery

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