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Journal of Virology, June 2003, p. 7034-7040, Vol. 77, No. 12
0022-538X/03/$08.00+0     DOI: 10.1128/JVI.77.12.7034-7040.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Intraventricular Brain Injection of Adeno-Associated Virus Type 1 (AAV1) in Neonatal Mice Results in Complementary Patterns of Neuronal Transduction to AAV2 and Total Long-Term Correction of Storage Lesions in the Brains of ß-Glucuronidase-Deficient Mice

Marco A. Passini,{dagger} Deborah J. Watson, Charles H. Vite, Daniel J. Landsburg, Alyson L. Feigenbaum, and John H. Wolfe*

Department of Pathobiology and Center for Comparative Medical Genetics, School of Veterinary Medicine, University of Pennsylvania, and Division of Neurology, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania 19104

Received 21 November 2002/ Accepted 14 March 2003

Inherited metabolic disorders that affect the central nervous system typically result in pathology throughout the brain; thus, gene therapy strategies need to achieve widespread delivery. We previously found that although intraventricular injection of the neonatal mouse brain with adeno-associated virus serotype 2 (AAV2) results in dispersed gene delivery, many brain structures were poorly transduced. This limitation may be overcome by using different AAV serotypes because the capsid proteins use different cellular receptors for entry, which may allow enhanced global targeting of the brain. We tested this with AAV1 and AAV5 vectors. AAV5 showed very limited brain transduction after neonatal injection, even though it has different transduction patterns than AAV2 in adult brain injections. In contrast, AAV1 vectors, which have not been tested in the brain, showed robust widespread transduction. Complementary patterns of transduction between AAV1 and AAV2 were established and maintained in the adult brain after neonatal injection. In the majority of structures, AAV1 transduced many more cells than AAV2. Both vectors transduced mostly neurons, indicating that differential expression of receptors on the surfaces of neurons occurs in the developing brain. The number of cells positive for a vector-encoded secreted enzyme (ß-glucuronidase) was notably greater and more widespread in AAV1-injected brains. A comprehensive analysis of AAV1-treated brains from ß-glucuronidase-deficient mice (mucopolysaccharidosis type VII) showed complete reversal of pathology in all areas of the brain for at least 1 year, demonstrating that the combination of this serotype and experimental strategy is therapeutically effective for treating global neurometabolic disorders.

* Corresponding author. Mailing address: 502G Abramson Research Center, Children's Hospital of Philadelphia, 3516 Civic Center Blvd., Philadelphia, PA 19104. Phone: (215) 590-7028. Fax: (215) 590-3779. E-mail: jhwolfe{at}vet.upenn.edu.

{dagger} Present address: Genzyme Corporation, Framingham, MA 01701.

Journal of Virology, June 2003, p. 7034-7040, Vol. 77, No. 12
0022-538X/03/$08.00+0     DOI: 10.1128/JVI.77.12.7034-7040.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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