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Journal of Virology, December 2005, p. 15175-15188, Vol. 79, No. 24
0022-538X/05/$08.00+0     doi:10.1128/JVI.79.24.15175-15188.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Restriction of Feline Immunodeficiency Virus by Ref1, Lv1, and Primate TRIM5{alpha} Proteins

Dyana T. Saenz,1 Wulin Teo,1 John C. Olsen,2 and Eric M. Poeschla1*

Molecular Medicine Program, Mayo Clinic College of Medicine, Rochester, Minnesota,1 Cystic Fibrosis Research and Treatment Center, University of North Carolina, Chapel Hill, North Carolina2

Received 11 July 2005/ Accepted 13 September 2005

The Ref1 and Lv1 postentry restrictions in human and monkey cells have been analyzed for lentiviruses in the primate and ungulate groups, but no data exist for the third (feline) group. We compared feline immunodeficiency virus (FIV) to other restricted (human immunodeficiency virus type 1 [HIV-1], equine infectious anemia virus [EIAV]) and unrestricted (NB-tropic murine leukemia virus [NB-MLV]) retroviruses across wide ranges of viral inputs in cells from multiple primate and nonprimate species. We also characterized restrictions conferred to permissive feline and canine cells engineered to express rhesus and human TRIM5{alpha} proteins and performed RNA interference (RNAi) against endogenous TRIM5{alpha}. We find that expression of rhesus or human TRIM5{alpha} proteins in feline cells restricts FIV, impairing pseudotyped vector transduction and viral replication, but rhesus TRIM5{alpha} is more restricting than human TRIM5{alpha}. Notably, however, canine cells did not support restriction by human TRIM5{alpha} and supported minimal restriction by rhesus TRIM5{alpha}, suggesting that these proteins may not function autonomously or that a canine factor interferes. Stable RNAi knockdown of endogenous rhesus TRIM5{alpha} resulted in marked increases in FIV and HIV-1 infectivities while having no effect on NB-MLV. A panel of nonprimate cell lines varied widely in susceptibility to lentiviral vector transduction, but normalized FIV and HIV-1 vectors varied concordantly. In contrast, in human and monkey cells, relative restriction of FIV compared to HIV-1 varied from none to substantial, with the greatest relative infectivity deficit for FIV vectors observed in human T-cell lines. Endogenous and introduced TRIM5{alpha} restrictions of FIV could be titrated by coinfections with FIV, HIV-1, or EIAV virus-like particles. Arsenic trioxide had complex and TRIM5{alpha}-independent enhancing effects on lentiviral but not NB-MLV infection. Implications for human gene therapy are discussed.

* Corresponding author. Mailing address: Molecular Medicine Program, Guggenheim 18, Mayo Clinic College of Medicine, 200 First Street SW, Rochester, MN 55905. Phone: (507) 284-3178. Fax: (507) 266-2122. E-mail: emp{at}mayo.edu.

Journal of Virology, December 2005, p. 15175-15188, Vol. 79, No. 24
0022-538X/05/$08.00+0     doi:10.1128/JVI.79.24.15175-15188.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



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