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Utility of microminipigs for evaluating liver-mediated gene expression in the presence of neutralizing antibody against vector capsid.
Gene Therapy ( IF 4.6 ) Pub Date : 2020-02-17 , DOI: 10.1038/s41434-020-0125-0
Ryota Watano 1 , Tsukasa Ohmori 2 , Shuji Hishikawa 3 , Asuka Sakata 4 , Hiroaki Mizukami 1
Affiliation  

Adeno-associated virus (AAV) vectors can transduce hepatocytes efficiently in vivo in various animal species, including humans. Few reports, however, have examined the utility of pigs in gene therapy. Pigs are potentially useful in preclinical studies because of their anatomical and physiological similarity to humans. Here, we evaluated the utility of microminipigs for liver-targeted gene therapy. These pigs were intravenously inoculated with an AAV8 vector encoding the luciferase gene, and gene expression was assessed by an in vivo imaging system. Robust transgene expression was observed almost exclusively in the liver, even though the pig showed a low-titer of neutralizing antibody (NAb) against the AAV8 capsid. We assessed the action of NAbs against AAV, which interfere with AAV vector-mediated gene transfer by intravascular delivery. When a standard dose of vector was administered intravenously, transgene expression was observed in both NAb-negative and low-titer (14×)-positive subjects, whereas gene expression was not observed in animals with higher titers (56×). These results are compatible with our previous observations using nonhuman primates, indicating that pigs are useful in gene therapy experiments, and that the role of low-titer NAb in intravenous administration of the AAV vector shows similarities across species.

中文翻译:


微型猪在存在针对载体衣壳的中和抗体的情况下评估肝脏介导的基因表达的效用。



腺相关病毒(AAV)载体可以在包括人类在内的各种动物体内有效转导肝细胞。然而,很少有报告研究猪在基因治疗中的效用。由于猪在解剖学和生理学上与人类相似,因此在临床前研究中可能有用。在这里,我们评估了微型猪在肝脏靶向基因治疗中的效用。这些猪被静脉注射编码荧光素酶基因的 AAV8 载体,并通过体内成像系统评估基因表达。尽管猪表现出低滴度的针对 AAV8 衣壳的中和抗体 (NAb),但几乎只在肝脏中观察到了强劲的转基因表达。我们评估了 NAb 对抗 AAV 的作用,AAV 通过血管内递送干扰 AAV 载体介导的基因转移。当静脉内施用标准剂量的载体时,在NAb阴性和低滴度(14×)阳性受试者中观察到转基因表达,而在较高滴度(56×)的动物中未观察到基因表达。这些结果与我们之前使用非人灵长类动物的观察结果一致,表明猪可用于基因治疗实验,并且低滴度 NAb 在 AAV 载体静脉注射中的作用显示出跨物种的相似性。
更新日期:2020-02-17
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