AAV vector-mediated correction of brain pathology in a mouse model of Niemann-Pick A disease

Marco A. Passini, Shannon L. Macauley, Michael R. Huff, Tatyana V. Taksir, Jie Bu, I. Huan Wu, Peter A. Piepenhagen, James C. Dodge, Lamya S. Shihabuddin, Catherine R. O'Riordan, Edward H. Schuchman, Gregory R. Stewart

Research output: Contribution to journalArticlepeer-review

83 Scopus citations

Abstract

Niemann-Pick A disease (NPA) is a fatal lysosomal storage disorder caused by a deficiency in acid sphingomyelinase (ASM) activity. The lack of functional ASM results in cellular accumulation of sphingomyelin and cholesterol within distended lysosomes throughout the brain. In this study, we investigated the potential of AAV-mediated expression of ASM to correct the brain pathology in an ASM knockout (ASMKO) mouse model of NPA. An AAV serotype 2 vector encoding human ASM (AAV2-hASM) was injected directly into the adult ASMKO hippocampus of one hemisphere. This resulted in expression of human ASM in all major cell layers of the ipsilateral hippocampus for at least 15 weeks postinjection. Transduced cells were also present in the entorhinal cortex, medial septum, and contralateral hippocampus in a pattern consistent with retrograde axonal transport of AAV2. There was a substantial reduction of distended lysosomes and an almost complete reversal of cholesterol accumulation in all areas of the brain that were targeted by AAV2-hASM. These findings show that the ASMKO brain is responsive to ASM replacement and that retrograde transport of AAV2 functions as a platform for widespread gene delivery and reversal of pathology in affected brain.

Original languageEnglish
Pages (from-to)754-762
Number of pages9
JournalMolecular Therapy
Volume11
Issue number5
DOIs
StatePublished - May 2005

Keywords

  • AAV
  • ASMKO
  • Acid sphingomyelinase
  • Adeno-associated virus
  • Axonal transport
  • CNS
  • Cholesterol
  • Gene therapy
  • Lysosomal storage disease
  • Neurodegeneration

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