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Journal of Virology, August 2001, p. 7662-7671, Vol. 75, No. 16
0022-538X/01/$04.00+0   DOI: 10.1128/JVI.75.16.7662-7671.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Enhancement of Muscle Gene Delivery with Pseudotyped Adeno-Associated Virus Type 5 Correlates with Myoblast Differentiation

Dongsheng Duan,1,2,* Ziying Yan,1,2 Yongping Yue,1,2 Wei Ding,1,2 and John F. Engelhardt1,2,3

Department of Anatomy and Cell Biology,1 Department of Internal Medicine,3 and Center for Gene Therapy of Cystic Fibrosis and Other Genetic Diseases,2 College of Medicine, The University of Iowa, Iowa City, Iowa 52242

Received 22 March 2001/Accepted 11 May 2001

Adeno-associated virus (AAV)-based muscle gene therapy has achieved tremendous success in numerous animal models of human diseases. Recent clinical trials with this vector have also demonstrated great promise. However, to achieve therapeutic benefit in patients, large inocula of virus will likely be necessary to establish the required level of transgene expression. For these reasons, efforts aimed at increasing the efficacy of AAV-mediated gene delivery to muscle have the potential for improving the safety and therapeutic benefit in clinical trials. In the present study, we compared the efficiency of gene delivery to mouse muscle cells for recombinant AAV type 2 (rAAV-2) and rAAV-2cap5 (AAV-2 genomes pseudo-packaged into AAV-5 capsids). Despite similar levels of transduction by these two vectors in undifferentiated myoblasts, pseudotyped rAAV-2cap5 demonstrated dramatically enhanced transduction in differentiated myocytes in vitro (>500-fold) and in skeletal muscle in vivo (>200-fold) compared to rAAV-2. Serotype-specific differences in transduction efficiency did not directly correlate with viral binding to muscle cells but rather appeared to involve endocytic or intracellular barriers to infection. Furthermore, application of this pseudotyped virus in a mouse model of Duchenne's muscular dystrophy also demonstrated significantly improved transduction efficiency. These findings should have a significant impact on improving rAAV-mediated gene therapy in muscle.

* Corresponding author. Mailing address: Department of Anatomy and Cell Biology, School of Medicine, University of Iowa, 51 Newton Rd., Room 1-111 BSB, Iowa City, IA 52242. Phone: (319) 335-7744. Fax: (319) 335-7198. E-mail: dongsheng-duan{at}uiowa.edu.

Journal of Virology, August 2001, p. 7662-7671, Vol. 75, No. 16
0022-538X/01/$04.00+0   DOI: 10.1128/JVI.75.16.7662-7671.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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