Abstract:
:We recently described a novel nonviral/viral vector for gene transfer, the plasmovirus (Noguiez-Hellin P, Robert-le Meur M, Laune S, et al. C R Acad Sci Paris, Sciences de la Vie. 1996;319:45-50; Noguiez-Hellin P, Robert-le Meur M, Salzmann J-L, et al. Proc Natl Acad Sci USA. 1996;93:4175-4180). Plasmoviruses are plasmids capable of expressing all the viral genes required for generating infectious particles and packaging a defective genome containing a transgene. Transfected as plasmids, plasmoviruses transform the transduced cells into packaging cells that release infectious replication-defective retrovirus vectors (RV) containing a transgene, which are capable of infecting nearby cells. We previously showed that such a vector can efficiently "propagate" the transgene after transfection. Here we examine in greater detail the different steps of plasmovirus replication in vitro in human (143 B TK-) and murine (NIH 3T3 TK-) cells. Molecular-biological analysis revealed plasmovirus-coded protein expression starting from 24 hours post-transfection, followed by the detection of infectious RV 48 hours post-transfection. The gag proteins were correctly processed in the released particles. Electron microscopic analysis revealed typical type C particles. Nonintegrated plasmovirus DNA was not toxic for the cells and could be detected for at least 14 days post-transfection. While the transfected gag gene and the transgene could also be detected throughout this period, we observed that env-coded proteins decreased after 72 hours post-transfection. Nevertheless, the production of RV resulted in the propagation of the transgene in the culture, with stable integration of plasmovirus proviral DNA into the host genome of infected cells. We show that this propagation results in a major improvement in therapeutic efficacy using an HSV1-TK transgene and ganciclovir treatment, when compared to that of plasmovirus constructs that cannot propagate. Altogether, these results demonstrate the functionality of this gene transfer method and suggest that improvements in the vector design enhance its efficacy.
journal_name
Cancer Gene Therjournal_title
Cancer gene therapyauthors
Morozov VA,Noguiez-Hellin P,Laune S,Tamboise E,Salzmann JL,Klatzmann Dsubject
Has Abstractpub_date
1997-09-01 00:00:00pages
286-93issue
5eissn
0929-1903issn
1476-5500journal_volume
4pub_type
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journal_title:Cancer gene therapy
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journal_title:Cancer gene therapy
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journal_title:Cancer gene therapy
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journal_title:Cancer gene therapy
pub_type: 杂志文章,评审
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journal_title:Cancer gene therapy
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journal_title:Cancer gene therapy
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journal_title:Cancer gene therapy
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更新日期:2004-11-01 00:00:00
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journal_title:Cancer gene therapy
pub_type: 杂志文章
doi:10.1038/sj.cgt.7700069
更新日期:1999-11-01 00:00:00
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journal_title:Cancer gene therapy
pub_type: 杂志文章
doi:10.1038/cgt.2015.68
更新日期:2016-02-01 00:00:00
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更新日期:2001-06-01 00:00:00
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journal_title:Cancer gene therapy
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journal_title:Cancer gene therapy
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journal_title:Cancer gene therapy
pub_type: 已发布勘误
doi:10.1038/s41417-020-0166-y
更新日期:2020-06-01 00:00:00
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journal_title:Cancer gene therapy
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