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Journal of Virology, January 2004, p. 1006-1011, Vol. 78, No. 2
0022-538X/04/$08.00+0     DOI: 10.1128/JVI.78.2.1006-1011.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Capsid-Dependent and -Independent Postentry Restriction of Primate Lentivirus Tropism in Rodent Cells

Aaron Diamond AIDS Research Center and The Rockefeller University, New York, New York

Received 7 July 2003/ Accepted 26 September 2003

Retrovirus tropism can be restricted by cellular factors such as Fv1, Ref1, and Lv1 that inhibit infection by targeting the incoming viral capsid. Here, we show that rodent cells exhibit differential sensitivity to infection by vesicular stomatitis virus G-pseudotyped lentiviruses and that differences between human immunodeficiency virus type 1 and simian immunodeficiency virus (SIVmac) infectivity are sometimes, but not always, governed by determinants in capsid-p2. In at least one case, resistance to SIVmac infection could be eliminated by saturation of target cells with noninfectious SIVmac particles. However, cross-saturation experiments and analysis of Fv1-null cells engineered to express natural or artificial Fv1 proteins revealed that lentivirus restriction in mouse cells is independent of Fv1. Overall, these findings indicate that novel restriction factors in rodents can modulate sensitivity to specific primate lentiviruses.

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