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Journal of Virology, October 2006, p. 9831-9836, Vol. 80, No. 19
0022-538X/06/$08.00+0     doi:10.1128/JVI.00878-06
Copyright © 2006, American Society for Microbiology. All Rights Reserved.

The 37/67-Kilodalton Laminin Receptor Is a Receptor for Adeno-Associated Virus Serotypes 8, 2, 3, and 9

Bassel Akache, Dirk Grimm, Kusum Pandey, Stephen R. Yant, Hui Xu, and Mark A. Kay*

Departments of Pediatrics and Genetics, Stanford University School of Medicine, Stanford, California

Received 1 May 2006/ Accepted 13 July 2006

Adeno-associated virus serotype 8 (AAV8) is currently emerging as a powerful gene transfer vector, owing to its capability to efficiently transduce many different tissues in vivo. While this is believed to be in part due to its ability to uncoat more readily than other AAV serotypes such as AAV2, understanding all the processes behind AAV8 transduction is important for its application and optimal use in human gene therapy. Here, we provide the first report of a cellular receptor for AAV8, the 37/67-kDa laminin receptor (LamR). We document binding of LamR to AAV8 capsid proteins and intact virions in vitro and demonstrate its contribution to AAV8 transduction of cultured cells and mouse liver in vivo. We also show that LamR plays a role in transduction by three other closely related serotypes (AAV2, -3, and -9). Sequence and deletion analysis allowed us to map LamR binding to two protein subdomains predicted to be exposed on the AAV capsid exterior. Use of LamR, which is constitutively expressed in many clinically relevant tissues and is overexpressed in numerous cancers, provides a molecular explanation for AAV8's broad tissue tropism. Along with its robust transduction efficiency, our findings support the continued development of AAV8-based vectors for clinical applications in humans, especially for tumor gene therapy.

* Corresponding author. Mailing address: Stanford University, Department of Pediatrics, 300 Pasteur Drive, Room G305, Stanford, CA 94305-5208. Phone: (650) 498-6531. Fax: (650) 498-6540. E-mail: markay{at}stanford.edu.

Journal of Virology, October 2006, p. 9831-9836, Vol. 80, No. 19
0022-538X/06/$08.00+0     doi:10.1128/JVI.00878-06
Copyright © 2006, American Society for Microbiology. All Rights Reserved.



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