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Complement regulatory proteins are incorporated into lentiviral vectors and protect particles against complement inactivation

Abstract

Lentiviral vectors pseudotyped with G glycoprotein from vesicular stomatitis virus (VSV-G) and baculovirus gp64 are inactivated by human complement. The extent of vector inactivation in serum from individual donors was examined and results showed wide donor-dependent variation in complement sensitivity for VSV-G-pseudotyped lentivectors. Amphotropic envelope (Ampho)-pseudotyped vectors were generally resistant to serum from all donors, while gp64-pseudotyped vectors were inactivated but showed less donor-to-donor variation than VSV-G. In animal sera, the vectors were mostly resistant to inactivation by rodent complement, whereas canine complement caused a moderate reduction in titer. In a novel advance for the lentiviral vector system, human complement–resistant-pseudotyped lentivector particles were produced through incorporation of complement regulatory proteins (CRPs). Decay accelerating factor (DAF)/CD55 provided the most effective protection using this method, while membrane cofactor protein (MCP)/CD46 showed donor-dependent protection and CD59 provided little or no protection against complement inactivation. Unlike previous approaches using CRPs to produce complement–resistant viral vectors, CRP-containing lentivectors particles were generated for this study without engineering the CRP molecules. Thus, through overexpression of native DAF/CD55 in the viral producer cell, an easy method was developed for generation of lentiviral vectors that are almost completely resistant to inactivation by human complement. Production of complement–resistant lentiviral particles is a critical step toward use of these vectors for in vivo gene therapy applications.

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Acknowledgements

We thank Sandy Sanchez for DNA sequencing and oligo synthesis as well as the Cell Genesys animal facility for mouse and rat serum. We are also grateful to Carol Lin for her efforts in CD55 Western blotting. Special thanks to members of the lentiviral vector group for helpful discussions and critical reading of the manuscript.

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Schauber-Plewa, C., Simmons, A., Tuerk, M. et al. Complement regulatory proteins are incorporated into lentiviral vectors and protect particles against complement inactivation. Gene Ther 12, 238–245 (2005). https://doi.org/10.1038/sj.gt.3302399

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