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Ikeda M, Habu Y, Miyano-Kurosaki N, Takaku H. Suppression of HIV-1 replication by a combination of endonucleolytic ribozymes (RNase P and tRNnase ZL). NUCLEOSIDES NUCLEOTIDES & NUCLEIC ACIDS 2006; 25:427-37. [PMID: 16838836 DOI: 10.1080/01457630600684120] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
We examined the combinatorial action of RNase P and tRNase ZL-mediated specific inhibition of HIV-1 in cultured cells. We designed two short extra guide sequences (sEGS) that specifically recognize the tat and vifregions of HIV-1 mRNA and mediate the subsequent cleavage of hybridized mRNA by the RNase P and tRNase ZL components. We constructed an RNase P and tRNase ZL-associated vif and tat sEGS expression vector; which used the RNA-polymerase III dependent U6 promoter, as an expression cassette for EGS. Together, the RNase P and tRNase ZL-associated sEGS molecules allow more efficient suppression of HIV-1 mRNA production when separately applied. The possibilities offered by the vector to encode sEGS will provide a powerful tool for gene therapy.
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Affiliation(s)
- Masahiro Ikeda
- Department of Life and Environmental Science, Faculty of Engineering, Chiba Institute of Technology, Narashino, Chiba, Japan
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Kaneko H, Suzuki H, Abe T, Miyano-Kurosaki N, Takaku H. Inhibition of HIV-1 replication by vesicular stomatitis virus envelope glycoprotein pseudotyped baculovirus vector-transduced ribozyme in mammalian cells. Biochem Biophys Res Commun 2006; 349:1220-7. [PMID: 16979590 DOI: 10.1016/j.bbrc.2006.08.184] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2006] [Accepted: 08/25/2006] [Indexed: 11/18/2022]
Abstract
The baculovirus has recently emerged as a promising vector for in vivo gene therapy. To investigate its potential as a delivery vector for an anti-virus ribozyme targeting HIV-1, we constructed recombinant baculovirus vectors bearing a ribozyme-synthesizing cassette driven by the tRNA(i)(Met) promoter with enhanced transduction efficiency by displaying vesicular stomatitis virus glycoprotein (VSV-G) on the viral envelope. Transduction of HeLa CD4(+) cells with a recombinant baculovirus delivering the HIV-1 U5 gene-specific ribozyme dramatically suppressed HIV-1 expression in this cell line. The VSV-G pseudotyped baculovirus vector-transduced ribozyme potently inhibited HIV-1 replication compared to a recombinant baculovirus vector-transduced ribozyme lacking VSV-G. The use of a baculovirus vector might be beneficial for application in gene therapy.
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Affiliation(s)
- Hiroyasu Kaneko
- Department of Life and Environmental Science, Faculty of Engineering, Chiba Institute of Technology, 2-17-1 Tsudanuma, Narashino, Chiba 275-0016, Japan
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Habu Y, Nagawa T, Matsumoto N, Takeuchi H, Miyano-Kurosaki N, Takaku H. Suppression of human immunodeficiency virus type 1 (HIV-1) replication by an HIV-1-dependent double locked vector with the Cre/loxP system. NUCLEOSIDES NUCLEOTIDES & NUCLEIC ACIDS 2006; 24:1907-17. [PMID: 16438057 DOI: 10.1080/15257770500269168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
We previously demonstrated the function of an HIV-1-dependent ribozyme expression vector, with which the site-specific excision of loxP sequences can be achieved by using the Cre-loxP system (ON/OFF) as a molecular switch in an acute HIV-1 infection. However, this expression system also revealed the lower, non-specific expression of the anti-H1V-1 ribozyme in the absence of tat. To circumvent this problem, we used the more efficient HIV-1-dependent Cre recombinase gene expression vector, encoding the LTR-gag-p17 (extending from the 5'-LTR to the middle of the gag gene (pLTR-gag-p17-Cre)). Comparatively, the pLTR-gag-p17-Cre induces a higher Cre-protein expression level in an HIV-1 infection-dependent manner than the minimal pLTR-Cre. Furthermore, we constructed the ploxP-Rz-U5 and pLTR-gag-p17-Cre plasmids and also combined them into a single vector, pLTR-gag-p17-Cre/loxP-Rz-U5, for a comparison of their anti-HIV-1 activities. The resultant simultaneous expression of the Cre protein and the homologous recombination of the two loxP sequences induced a high level of HIV-1 replication inhibition (95%). Significantly, a high steady-state of ribozyme expression was observed in the RT-PCR analysis. These data imply that targeting the HIV-1 genes with the pLTR-gag-p17-Cre/loxP-Rz-U5 vector, which mediates HIV-1-dependent ribozyme expression, would be a useful tool for HIV-1 gene therapy applications.
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Affiliation(s)
- Yuichiro Habu
- Department of Life and Environmental Sciences, Chiba Institute of Technoloy, Narashino, Chiba, Japan
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Habu Y, Miyano-Kurosaki N, Kitano M, Endo Y, Yukita M, Ohira S, Takaku H, Nashimoto M, Takaku H. Inhibition of HIV-1 gene expression by retroviral vector-mediated small-guide RNAs that direct specific RNA cleavage by tRNase ZL. Nucleic Acids Res 2005; 33:235-43. [PMID: 15647506 PMCID: PMC546152 DOI: 10.1093/nar/gki164] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2004] [Revised: 12/15/2004] [Accepted: 12/15/2004] [Indexed: 11/13/2022] Open
Abstract
The tRNA 3'-processing endoribonuclease (tRNase Z or 3' tRNase; EC 3.1.26.11) is an essential enzyme that removes the 3' trailer from pre-tRNA. The long form (tRNase ZL) can cleave a target RNA in vitro at the site directed by an appropriate small-guide RNA (sgRNA). Here, we investigated whether this sgRNA/tRNase ZL strategy could be applied to gene therapy for AIDS. We tested the ability of four sgRNA-expression plasmids to inhibit HIV-1 gene expression in COS cells, using a transient-expression assay. The three sgRNAs guide inhibition of HIV-1 gene expression in cultured COS cells. Analysis of the HIV-1 mRNA levels suggested that sgRNA directed the tRNase ZL to mediate the degradation of target RNA. The observation that sgRNA was localized primarily in nuclei suggests that tRNase ZL cleaves the HIV-1 mRNA when complexed with sgRNA in this location. We also examined the ability of two retroviral vectors expressing sgRNA to suppress HIV-1 expression in HIV-1-infected Jurkat T cells. sgRNA-SL4 suppressed HIV-1 expression almost completely in infected cells for up to 18 days. These results suggest that the sgRNA/tRNase ZL approach is effective in downregulating HIV-1 gene expression.
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Affiliation(s)
- Yuichiro Habu
- High Technology Research Center, Chiba Institute of Technology2-17-1 Tsudanuma, Narashino, Chiba 275-0016, Japan
| | - Naoko Miyano-Kurosaki
- Department of Life and Environmental Sciences, Chiba Institute of Technology2-17-1 Tsudanuma, Narashino, Chiba 275-0016, Japan
- High Technology Research Center, Chiba Institute of Technology2-17-1 Tsudanuma, Narashino, Chiba 275-0016, Japan
| | - Michiko Kitano
- Department of Life and Environmental Sciences, Chiba Institute of Technology2-17-1 Tsudanuma, Narashino, Chiba 275-0016, Japan
| | - Yumihiko Endo
- Department of Life and Environmental Sciences, Chiba Institute of Technology2-17-1 Tsudanuma, Narashino, Chiba 275-0016, Japan
| | - Masakazu Yukita
- Department of Life and Environmental Sciences, Chiba Institute of Technology2-17-1 Tsudanuma, Narashino, Chiba 275-0016, Japan
| | - Shigeru Ohira
- Department of Life and Environmental Sciences, Chiba Institute of Technology2-17-1 Tsudanuma, Narashino, Chiba 275-0016, Japan
| | - Hiroaki Takaku
- Department of Applied Life Sciences, Niigata University of Pharmacy and Applied Life Sciences265-1 Higashito, Niitsu, Niigata 956-8603, Japan
| | - Masayuki Nashimoto
- Department of Applied Life Sciences, Niigata University of Pharmacy and Applied Life Sciences265-1 Higashito, Niitsu, Niigata 956-8603, Japan
| | - Hiroshi Takaku
- Department of Life and Environmental Sciences, Chiba Institute of Technology2-17-1 Tsudanuma, Narashino, Chiba 275-0016, Japan
- High Technology Research Center, Chiba Institute of Technology2-17-1 Tsudanuma, Narashino, Chiba 275-0016, Japan
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Barnor JS, Endo Y, Habu Y, Miyano-Kurosaki N, Kitano M, Yamamoto H, Takaku H. Effective inhibition of HIV-1 replication in cultured cells by external guide sequences and ribonuclease P. Bioorg Med Chem Lett 2004; 14:4941-4. [PMID: 15341956 DOI: 10.1016/j.bmcl.2004.07.021] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2004] [Revised: 07/06/2004] [Accepted: 07/12/2004] [Indexed: 11/29/2022]
Abstract
We examined the suppressive effect of HIV-1 RNA gene cleavage on HIV-1 expression, using the catalytic RNA subunit RNase P and the 3'-half tRNA(Try) [external guide sequence (EGS)] in cultured cells. HIV-1 expression was inhibited by the tRNA(met)-EGS-U5 and U6-EGS-U5 from the tRNA(met) and U6 promoters, respectively. There was no difference in the inhibitory effects on HIV-1 expression between the tRNA(met) and U6 promoters.
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Affiliation(s)
- Jacob S Barnor
- Department of Life and Environmental Sciences, Faculty of Engineering, Chiba Institute of Technology, 2-17-1 Tsudanuma, Narashino, Chiba 275-0016, Japan
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