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NEJM:寨卡病毒DNA疫苗的安全性和免疫原性分析

2021-09-16 MedSci原创 MedSci原创

在这个1期开放标签临床试验中,DNA疫苗可引发抗ZIKV免疫反应。需要进一步研究以更好地评估疫苗的安全性和疗效。

尽管寨卡病毒(ZIKV)感染通常具有自限性,但其他相关并发症如先天性出生缺陷和格林巴利综合征也得到了很好的描述。目前还没有批准的针对ZIKV感染的疫苗。


近日,顶级医学期刊NEJM上发表了一篇研究文章,在这项开放标签的1期临床试验中,研究人员评估了编码ZIKV前膜和包膜蛋白的合成共有DNA疫苗(GLS-5700)的安全性和免疫原性,每组20名参与者。参与者皮内注射1 mg或2 mg疫苗,每次注射后在基线、4周和12周进行电穿孔(使用脉冲电场将DNA序列导入细胞)。

参与者的中位年龄为38岁,其中60%为女性;78%是白人,22%是黑人;此外,30%是西班牙裔。在第14周(即接种第三剂疫苗后)的中期分析中,没有报告严重的不良事件。大约50%的参与者发生了疫苗接种部位的局部反应(例如注射部位疼痛、发红、肿胀和瘙痒)。

接种第三剂疫苗后,所有参与者均检测到结合抗体(通过酶联免疫吸附测定法测量得到),接种1 mg和2 mg疫苗的受试者的几何平均滴度分别为1642和2871。在Vero细胞试验中,62%的样品产生了中和抗体。在神经元细胞中检查,70%的血清样本中ZIKV感染的抑制率为90%,95%的样本中的抑制率为50%。腹膜内注射疫苗后血清保护了112只IFNAR敲除小鼠中的103只(92%),这些小鼠受到致死剂量ZIKV-PR209毒株攻击;接受基线血清的小鼠都没有在疫苗攻击中存活下来。存活与中和效价无关。
 
由此可见,在这个1期开放标签临床试验中,DNA疫苗可引发抗ZIKV免疫反应。需要进一步研究以更好地评估疫苗的安全性和疗效。

原始出处:
 
Pablo Tebas,et al.Safety and Immunogenicity of an Anti–Zika Virus DNA Vaccine.NEJM.2021.https://www.nejm.org/doi/full/10.1056/NEJMoa1708120

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    2021-09-18 mnda
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    2021-09-17 刘明国

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