Prolonged transgene expression mediated by a helper-dependent adenoviral vector (hdAd) in the central nervous system.

Prolonged transgene expression mediated by a helper-dependent adenoviral vector (hdAd) in the central nervous system.
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中枢神经系统中辅助依赖性腺病毒载体(hdAd)介导的转基因表达延长。

DOI:
10.1006/mthe.2000.0104
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发表时间:
2000
期刊:
Molecular therapy : the journal of the American Society of Gene Therapy.
影响因子:
--
通讯作者:
Yang,K
Yang,K
中科院分区:
--
文献类型:
--
作者:
Zou,L;Zhou,H;Pastore,L;Yang,K

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常规的腺病毒载体如E1缺失的第一代腺病毒(fgAd)引起显著的宿主免疫应答,导致转基因的有限表达。最近描述的辅助依赖性或无肠腺病毒载体(hdAd)可以促进外周器官(包括肝脏)中的稳定转基因表达。因此,我们研究的安全性和持久性hdAd介导的基因转移到中枢神经系统(CNS)的大鼠相比,基因传递fgAd。将等量的携带βgeo转基因的fgAd或hdAd立体定向注射到成年大鼠的右侧海马中。通过组织化学染色评估转基因表达,通过PCR分析评估转基因稳定性,通过免疫细胞化学方法评估T淋巴细胞和巨噬细胞的免疫浸润。在接种后第6天检查的脑组织中检测到来自任一载体的强转基因表达。此后,fgAd介导的基因表达迅速下降,到第66天变得不可检测,而来自hdAd载体的表达在整个测试期间持续存在。PCR证实hdAd相关DNA的存在,在接种后66天。hdAd注射引起的脑浸润巨噬细胞和T细胞的数量明显低于fgAd的管理。这些结果表明使用hdAd将基因递送至CNS改善了转基因表达并降低了免疫原性。
Conventional adenoviral vectors such as E1-deleted first-generation adenovirus (fgAd) elicit striking host immune response, resulting in limited expression of the transgene. A recently described helper-dependent, or gutless, adenoviral vector (hdAd) can promote stable transgene expression in peripheral organs, including the liver. We therefore investigated the safety and durability of hdAd-mediated gene transfer to the central nervous system (CNS) of rats compared with gene delivery by fgAd. Equal amounts of either fgAd or hdAd carrying the βgeo transgene were stereotactically injected into the right hippocampus of adult rats. Transgene expression was assessed by histochemical staining, transgene stability by PCR analysis, and immune infiltration of T lymphocytes and macrophages by immunocytochemical methods. Strong transgene expression from either vector was detected in brain tissue examined on day 6 postinoculation. Thereafter, fgAd-mediated gene expression rapidly decreased, becoming undetectable by day 66, while expression from the hdAd vector persisted throughout the test period. PCR confirmed the presence of hdAd-associated DNA at 66 days postinoculation. The hdAd injection elicited apparently lower numbers of brain-infiltrating macrophages and T cells than did administration of fgAd. These results indicate improved transgene expression and reduced immunogenicity with use of hdAd to deliver genes to the CNS.
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