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Influenza H7N9 Virus Neuraminidase-Specific Human Monoclonal Antibodies Inhibit Viral Egress and Protect from Lethal Influenza Infection in Mice.
Cell Host & Microbe ( IF 20.6 ) Pub Date : 2019-11-19 , DOI: 10.1016/j.chom.2019.10.003
Iuliia M Gilchuk 1 , Sandhya Bangaru 2 , Pavlo Gilchuk 1 , Ryan P Irving 1 , Nurgun Kose 1 , Robin G Bombardi 1 , Natalie J Thornburg 1 , C Buddy Creech 3 , Kathryn M Edwards 3 , Sheng Li 4 , Hannah L Turner 5 , Wenli Yu 5 , Xueyong Zhu 5 , Ian A Wilson 6 , Andrew B Ward 5 , James E Crowe 7
Affiliation  

H7N9 avian influenza virus causes severe infections and might have the potential to trigger a major pandemic. Molecular determinants of human humoral immune response to N9 neuraminidase (NA) proteins, which exhibit unusual features compared with seasonal influenza virus NA proteins, are ill-defined. We isolated 35 human monoclonal antibodies (mAbs) from two H7N9 survivors and two vaccinees. These mAbs react to NA in a subtype-specific manner and recognize diverse antigenic sites on the surface of N9 NA, including epitopes overlapping with, or distinct from, the enzyme active site. Despite recognizing multiple antigenic sites, the mAbs use a common mechanism of action by blocking egress of nascent virions from infected cells, thereby providing an antiviral prophylactic and therapeutic protection in vivo in mice. Studies of breadth, potency, and diversity of antigenic recognition from four subjects suggest that vaccination with inactivated adjuvanted vaccine induce NA-reactive responses comparable to that of H7N9 natural infection.

中文翻译:


H7N9 流感病毒神经氨酸酶特异性人单克隆抗体可抑制病毒流出并保护小鼠免受致命流感感染。



H7N9禽流感病毒会引起严重感染,并有可能引发大流行。 N9 神经氨酸酶 (NA) 蛋白与季节性流感病毒 NA 蛋白相比表现出不寻常的特征,但人类体液免疫反应的分子决定因素尚不明确。我们从两名 H7N9 幸存者和两名疫苗接种者身上分离出 35 种人单克隆抗体 (mAb)。这些 mAb 以亚型特异性方式与 NA 发生反应,并识别 N9 NA 表面上的不同抗原位点,包括与酶活性位点重叠或不同的表位。尽管识别多个抗原位点,单克隆抗体仍使用共同的作用机制,通过阻止新生病毒粒子从受感染细胞中流出,从而在小鼠体内提供抗病毒预防和治疗保护。对四名受试者抗原识别的广度、效力和多样性的研究表明,接种灭活佐剂疫苗可诱导与 H7N9 自然感染相当的 NA 反应性反应。
更新日期:2019-11-20
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