Sustained small interfering RNA-mediated human immunodeficiency virus type 1 inhibition in primary macrophages

Erwei Song, Sang Kyung Lee, Derek M Dykxhoorn, Carl Novina, Dong Zhang, Keith Crawford, Jan Cerny, Phillip A. Sharp, Judy Lieberman, N. Manjunath, Premlata Shankar

Research output: Contribution to journalArticle

204 Citations (Scopus)

Abstract

Small interfering RNAs (siRNAs) can induce potent gene silencing by degradation of cognate mRNA. However, in dividing cells, the silencing lasts only 3 to 7 days, presumably because of siRNa, dilution with cell division. Here, we investigated if sustained siRNA-mediated silencing of human immunodeficiency virus type 1 (HIV-1) is possible in terminally differentiated macrophages, which constitute an important reservoir of HIV in vivo. CCR5, the major HIV-1 coreceptor in macrophages, and the viral structural gene for p24 were targeted either singly or in combination. When transfected 2 days prior to infection, both CCR5 and p24 siRNAs effectively reduced HIV-1 infection for the entire 15-day period of observation, and combined targeting of both genes abolished infection. To investigate whether exogenously introduced siRNA is maintained stably in macrophages, we tested the kinetics of siRNA-mediated viral inhibition by initiating infections at various times (2 to 15 days) after transfection with CCR5 and p24 siRNAs. HIV suppression mediated by viral p24 siRNA progressively decreased and was lost by day 7 posttransfection. In contrast, viral inhibition by cellular CCR5 knockdown was sustained even when transfection preceded infection by 15 days, suggesting that the continued presence of target RNA may be needed for persistence of siRNA. The longer sustenance of CCR5 relative to p24 siRNA in uninfected macrophages was also confirmed by detection of internalized siRNA by modified Northern blot analysis. We also tested the potential of p24 siRNA to stably silence HIV in the setting of an established infection where the viral target gene is actively transcribed. Under these circumstances, long-term suppression of HIV replication could be achieved with p24 siRNA. Thus, siRNAs can induce potent and long-lasting HIV inhibition in nondividing cells such as macrophages.

Original languageEnglish
Pages (from-to)7174-7181
Number of pages8
JournalJournal of Virology
Volume77
Issue number13
DOIs
StatePublished - Jul 1 2003
Externally publishedYes

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small interfering RNA
Human immunodeficiency virus 1
Small Interfering RNA
HIV-1
macrophages
Macrophages
HIV
infection
Infection
Viral Genes
transfection
Transfection
Gene Targeting
structural genes
RNA Stability
Gene Silencing
gene targeting
gene silencing
Virus Diseases
Northern blotting

ASJC Scopus subject areas

  • Immunology

Cite this

Sustained small interfering RNA-mediated human immunodeficiency virus type 1 inhibition in primary macrophages. / Song, Erwei; Lee, Sang Kyung; Dykxhoorn, Derek M; Novina, Carl; Zhang, Dong; Crawford, Keith; Cerny, Jan; Sharp, Phillip A.; Lieberman, Judy; Manjunath, N.; Shankar, Premlata.

In: Journal of Virology, Vol. 77, No. 13, 01.07.2003, p. 7174-7181.

Research output: Contribution to journalArticle

Song, E, Lee, SK, Dykxhoorn, DM, Novina, C, Zhang, D, Crawford, K, Cerny, J, Sharp, PA, Lieberman, J, Manjunath, N & Shankar, P 2003, 'Sustained small interfering RNA-mediated human immunodeficiency virus type 1 inhibition in primary macrophages', Journal of Virology, vol. 77, no. 13, pp. 7174-7181. https://doi.org/10.1128/JVI.77.13.7174-7181.2003
Song, Erwei ; Lee, Sang Kyung ; Dykxhoorn, Derek M ; Novina, Carl ; Zhang, Dong ; Crawford, Keith ; Cerny, Jan ; Sharp, Phillip A. ; Lieberman, Judy ; Manjunath, N. ; Shankar, Premlata. / Sustained small interfering RNA-mediated human immunodeficiency virus type 1 inhibition in primary macrophages. In: Journal of Virology. 2003 ; Vol. 77, No. 13. pp. 7174-7181.
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