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- W3120803708 abstract "Porcine reproductive and respiratory syndrome virus (PRRSV) is an economically important pathogen affecting global swine industry. Our recent study has shown that the first four Ig-like domains of sialoadhesin (Sn4D) and the scavenger receptor cysteine-rich domains 5–9 (SRCR59) of CD163 can act as the soluble viral receptors (SVRs) of PRRSV. Co-injection with the two SVR-expressing recombinant adenovirus (rAd) vectors can protect pigs from the lethal challenge with three PRRSV strains. However, the in vivo expression of the two SVRs persists for only two weeks and thus their long-term anti-PRRSV effects remain to be improved. In this study, we fused the two SVRs with a flexible linker or self-cleaving peptide and expressed them with a single recombinant adeno-associated virus (rAAV) vector. The two rAAVs, namely rAAV-Sn4D-SRCR59-Fc and rAAV-SRCR59-Fc/Sn4D-Fc, were generated by using baculovirus-insect cell system. Western blotting analysis showed that the two SVR fusions were efficiently expressed in and secreted from the rAAV-transduced cells. Viral infection blocking assay showed that PRRSV titers in porcine alveolar macrophage (PAM) cells were reduced by 1.6–2.7 log10 after co-cultivation with rAAV-Sn4D-SRCR59-Fc-transduced cells or by 1.9–3.2 log10 after co-cultivation with rAAV-SRCR59-Fc/Sn4D-Fc-transduced cells. After single-dose injection of mice with the rAAV vectors, the expression of two SVR fusions persisted for at least 35 days, which was significantly longer than SRCR59-Fc expression in rAd-SRCR59-Fc-injected mice. Among the two SVR fusions expressed, both expression level and anti-PRRSV activity of SRCR59-Fc/Sn4D-Fc were higher than that of Sn4D-SRCR59-Fc. Therefore, rAAV-SRCR59-Fc/Sn4D-Fc generated can be developed as a novel anti-PRRSV reagent." @default.
- W3120803708 created "2021-01-18" @default.
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- W3120803708 date "2021-03-01" @default.
- W3120803708 modified "2023-10-14" @default.
- W3120803708 title "Fusion expression of the two soluble viral receptors of porcine reproductive and respiratory syndrome virus with a single adeno-associated virus vector" @default.
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- W3120803708 doi "https://doi.org/10.1016/j.rvsc.2020.12.026" @default.
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