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• W2070804947 abstract "Background Human monocytes play an important role in mediating human immunodeficiency virus type 1 (HIV-1) infection of the central nervous system (CNS), and monocytes-derived macrophages (MDM) represent a major viral reservoir within the brain and other target organs. Current gene transduction of MDM is hindered by a limited efficiency. In this study we established a lentiviral vector-based technique for improved gene transfer into human MDM cultures in vitro and demonstrated significant protection of transduced MDM from super-infection with wild-type HIV-1. Methods HIV-1-based lentiviral vector stocks were prepared in 293T cells by the established calcium phosphate transfection method. Human monocytes were isolated from donors' blood by Ficoll-Paque separation and cultured in vitro. To establish an effective technique for vector-mediated gene transfer, primary cultures of human MDM were transduced at varying multiplicities of infection (MOI) and at a range of time points following initial isolation of cells (time-in-culture). Transduced cells were then examined for transgene (green fluorescent protein (GFP)) expression by fluorescent microscopy and reverse transcription polymerase chain reaction (RT-PCR). These cultures were then exposed to wild-type HIV-1, and viral replication was quantitated by p24 assay; production of neurotoxic effector molecules by the transduced MDM was also examined, using indicator neurons. Results We have demonstrated that primary human MDM could be efficiently transduced (>50%) with concentrated HIV-1-based defective lentiviral vectors (DLV). Furthermore, DLV-mediated gene transduction was stable, and the transduced cells exhibited no apparent difference from normal MDM in terms of their morphology, viability and neurotoxin secretion. Challenge of DLV-transduced MDM cultures with HIV-1Ba-L revealed a 4- to 5-fold reduction in viral replication, as measured by p24 antigen production. This effect was associated with the mobilization of the GFP-expressing DLV construct by the wild-type virus. Conclusions These data demonstrate the inhibition of HIV-1 replication in primary MDM, by a DLV vector that lacks any anti-HIV-1 transgene. These findings lay the initial groundwork for future studies on the ability of DLV-modified monocytes to introduce anti-HIV-1 genes into the CNS. Lentiviral vector-mediated gene delivery to the CNS by monocytes/macrophages is a promising, emerging strategy for treating neuro-AIDS. Copyright © 2005 John Wiley & Sons, Ltd." @default.
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• W2070804947 date "2005-01-01" @default.
• W2070804947 modified "2023-10-02" @default.
• W2070804947 title "HIV-1-based defective lentiviral vectors efficiently transduce human monocytes-derived macrophages and suppress replication of wild-type HIV-1" @default.
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• W2070804947 doi "https://doi.org/10.1002/jgm.825" @default.
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