Deoxyzyme of anti-respiratory syncytial viruses and its medicinal use
A syncytial virus and anti-respiratory technology, which is applied to the anti-respiratory syncytial virus deoxyribozyme and its application in medicine, and can solve the problems of no reliable vaccine and anti-RSV preparations.
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Embodiment 1
[0062] Example 1: Design of deoxyribozyme constructs. The selection of the DZ cleavage site in the target RNA mainly considers three factors:
[0063] First, this site is critical for viral replication. The genome of RSV is a non-phasic negative-strand RNA containing approximately 15,000 nucleotides with a structure of 3'-NS1-NS2-N-P-M-SH-G-F-M2(M2-1-M2-2)-L-5' , encoding the corresponding 11 viral proteins: nucleocapsid protein N, phosphoprotein P, polymerase subunit L, transcription elongation factor M2-1, fusion protein F, adhesion protein G and small hydrophobin SH, nonstructural protein NS1 and NS2, matrix protein M and M2-2. During virus replication, nucleocapsid protein N plays an important function. It is an important part of the viral polymerase complex (N, P, L proteins). The viral mRNA is transcribed from the negative-strand genomic RNA under the action of the polymerase complex. This polymerase complex also uses the positive-strand intermediate RNA A new negati...
Embodiment 2
[0071] Example 2: In Vitro Cleavage of RNA Targets by DNAzymes
[0072] Hep-2 human laryngeal epithelial carcinoma cells were routinely cultured in the limit essential essential oil containing 10% inactivated fetal bovine serum (FBS, Hyclon, Logan, UT), 2mM L-glutamine, 100u / ml penicillin and 100μg / ml streptomycin Medium (Dulbecco's modified Eagle's medium Dulbecco, DMEM), culture conditions: 37 ° C, 5% CO 2 .
[0073] Human respiratory syncytial virus subtype B standard strain RSV CH18537 was subcultured in Hep-2 cells cultured in DMEM (virus maintenance solution) containing 2% fetal bovine serum and antibiotics. When the Cytopathic Effect (CPE) reaches 75%-100%, that is, CPE+++-++++ (infected cytopathic degree evaluation method: 0%-25% cells have lesions, which are recorded as CPE+; 25%-50% cells have lesions Lesions, recorded as CPE++; 50%-75% of cells with diseased, recorded as CPE+++; 75%-100% of cells with pathological changes, recorded as CPE++++) Collect and aliquot ...
Embodiment 3
[0077] Example 3: Inhibitory effect of deoxyribozymes on viral replication in infected cells
[0078] Hep-2 cells were routinely cultured in DMEM medium containing antibiotics and 10% FBS. The RSV A2 standard strain, CH 18537 strain, and six wild strains in Chongqing were isolated from the snuff secretions of hospitalized patients; the other four wild RSV strains were isolated in the 2001-2002 epidemic season in Beijing, and these four clinical isolates were not tested. Typing. All the above viruses were subcultured in Hep-2 cells at 37° C., and the culture medium was DMEM (virus maintenance solution) containing antibiotics and 2% FBS. The supernatant was collected when the cytopathy reached 75%-100% (CPE+++-++++), and stored at -80°C after aliquoting. Virus titers were determined on Hep-2 cultured cells using a plaque formation assay. The titer of the virus used was 1.7×10 5 to 6.5×10 7 / ml.
[0079] A monolayer of Hep-2 cells in a 6-well culture plate was infected with...
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