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. 1992 Nov 15;89(22):10802–10806. doi: 10.1073/pnas.89.22.10802

Inhibition of human immunodeficiency virus type 1 expression by a hairpin ribozyme.

J O Ojwang 1, A Hampel 1, D J Looney 1, F Wong-Staal 1, J Rappaport 1
PMCID: PMC50430  PMID: 1438280

Abstract

Ribozymes are RNAs that possess the dual properties of RNA sequence-specific recognition, analogous to conventional antisense molecules, and RNA substrate destruction via site-specific cleavage. The cleavage reaction is catalytic in that more than one substrate molecule is processed per ribozyme molecule. We have designed a hairpin ribozyme that cleaves human immunodeficiency virus type 1 (HIV-1) RNA in the leader sequence (at nucleotides +111/112 relative to the transcription initiation site). The ribozyme was tested in vitro and gave efficient and specific cleavage of RNA containing the leader sequence. To test the antiviral efficacy of this ribozyme, we have cotransfected into HeLa cells HIV-1 proviral DNA and a plasmid expressing the ribozyme from the human beta-actin promoter. HIV-1 expression was inhibited as measured by p24 antigen levels and reduced Tat activity. The antiviral effect of the ribozyme appears to be specific and results from directed RNA cleavage; activity requires both a target sequence and a functional RNA catalytic center. These results suggest that this HIV-1-directed hairpin ribozyme may be useful as a therapeutic agent.

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