IIIa deleted adenovirus as a single-cycle genome replicating vector.

IIIa deleted adenovirus as a single-cycle genome replicating vector.
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DOI:
10.1016/j.virol.2014.05.030
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发表时间:
2014-08
期刊:
影响因子:
3.7
通讯作者:
Barry, Michael A.
Barry, Michael A.
中科院分区:
医学3区
文献类型:
--
作者:
Crosby, Catherine M.;Barry, Michael A.

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可复制腺病毒(RC-Ad)载体通过复制扩增转基因介导稳健的转基因表达,但也使患者处于坦率的腺病毒感染的风险中。相比之下,E1缺失的复制缺陷型Ad(RD-Ad)载体更安全,但产生的转基因产物少得多。为了产生稳健但更安全的腺病毒载体,我们创建了“单循环”腺病毒(SC-Ad)载体,其复制其基因组和转基因,但通过删除低血清阳性率腺病毒血清型6中的衣壳粘固蛋白IIIa而不引起腺病毒感染。Ad 6-ΔIIIa可以在表达IIIa的细胞系中产生。在正常细胞中,Ad 6-ΔIIIa复制其基因组和转基因,但不能包装其DNA或形成成熟病毒。SC-Ad和RC-Ad在体外和小鼠体内的人和小鼠细胞中表达的转基因比RD-Ad高数百倍。这些数据表明,SC-Ads可能是用于疫苗和治疗应用的更安全的扩增载体。
Replication competent adenovirus (RC-Ad) vectors mediate robust transgene expression by virtue of amplifying transgenes by replication, but also put patients at a risk of frank adenovirus infection. In contrast, E1-deleted replication defective Ad (RD-Ad) vectors are safer, but produce substantially less transgene product. To generate a robust, but safer adenoviral vector, we created a “single cycle" adenovirus (SC-Ad) vector that replicates its genome and transgene, but that does not cause adenovirus infections by deleting the capsid cement protein IIIa in low seroprevalence adenovirus serotype 6. Ad6-ΔIIIa can be produced in IIIa-expressing cell lines. In normal cells, Ad6-ΔIIIa replicates its genome and transgene, but fails to package its DNA or form mature virus. SC-Ad and RC-Ad expressed transgenes hundreds of times higher than RD-Ad in human and mouse cells in vitro and in vivo in mice. These data suggest that SC-Ads may be safer amplifying vectors for vaccine and therapeutic applications.
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