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. 1997 May;71(5):4079–4085. doi: 10.1128/jvi.71.5.4079-4085.1997

Stable human immunodeficiency virus type 1 (HIV-1) resistance in transformed CD4+ monocytic cells treated with multitargeting HIV-1 antisense sequences incorporated into U1 snRNA.

D Liu 1, J Donegan 1, G Nuovo 1, D Mitra 1, J Laurence 1
PMCID: PMC191561  PMID: 9094686

Abstract

We have approached the development of a human immunodeficiency virus type 1 (HIV-1) therapeutic product by producing immune cells stably resistant to HIV-1. Promonocytic CD4+ cells (U937) were made resistant to HIV-1 by the introduction of a DNA construct (pNDU1A,B,C) that contained three independent antisense sequences directed against two functional regions, transactivation response and tat/rev, of the HIV-1 target. Each sequence was incorporated into the transcribed region of a U1 snRNA gene to generate U1/HIV antisense RNA. Stably transfected cells expressed all three U1/HIV antisense transcripts, and these transcripts accumulated in the nucleus. These cells were subjected to two successive challenges with HIV-1 (BAL strain). The surviving cells showed normal growth characteristics and have retained their CD4+ phenotype. In situ hybridization assays showed that essentially all of the surviving cells produced U1/HIV antisense RNA. No detectable p24 antigen was observed, no syncytium formation was observed, and PCR-amplified HIV gag sequences were not detected. Rechallenge with HIV-1 (IIIB strain) similarly yielded no infection at a relatively high multiplicity of infection. As a further demonstration that the antisense RNA directed against HIV-1 was functioning in these transfected immune cells, Tat-activated expression of chloramphenicol acetyltransferase was shown to be specifically inhibited in cells expressing Tat and transactivation response region antisense sequences.

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Selected References

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