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Viruses 2015, 7(8), 4369-4384; doi:10.3390/v7082821

Characterization of Humoral Responses Induced by an H7N9 Influenza Virus-Like Particle Vaccine in BALB/C Mice

1
Department of Vaccine Clinical Evaluation, Jiangsu Provincial Center for Disease Preventionand Control, Nanjing 210009, China
2
Department of HIV/STD prevention and control, Jiangsu Provincial Center for Disease Preventionand Control, Nanjing 210009, China
3
Institute of Pathogenic Microbiology, Jiangsu Provincial Center for Disease Prevention and Control, Key Laboratory of Enteric Pathogenic Microbiology, Ministry Health, Nanjing 210009, China
These authors contributed equally to this work.
*
Authors to whom correspondence should be addressed.
Academic Editor: Curt Hagedorn
Received: 2 April 2015 / Revised: 2 April 2015 / Accepted: 27 July 2015 / Published: 4 August 2015
(This article belongs to the Section Antivirals & Vaccines)
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Abstract

In April 2013, human infections with a novel avian influenza (H7N9) virus emerged in China. It has caused serious concerns for public health throughout the world. However, there is presently no effective treatment, and an A (H7N9) H7 subtype influenza vaccine is not available. Vaccination with virus-like particles (VLPs) has showed considerable promise for many other subtype influenza viruses. To produce H7N9 VLPs, full length, unmodified hemagglutinin (HA), neuraminidase (NA), and matrix1 (M1) genes from the A/Wuxi/1/2013(H7N9) were cloned into a pCDNA5.1 FRT vector. By co-transfection, VLPs containing HA, NA, and M1 were secreted by 293T cells. VLPs were purified by ultracentrifugation and injected into mice by the intramuscular route. In animal experiments, humoral and cellular immunoresponse were all triggered by H7N9 VLPs. High levels of specific antibodies and the isotypes of IgG were detected by ELISA. Anamnestic cellular immune responses were examined by detecting specific cytotoxic T cell for IFN-Υ production in ELISPOT assay. The hemagglutination-inhibition (HAI) against the homologous virus was more than 1:64, and cross-reactive HAI titers against the heterologous virus (H1N1 and H3N2) were more than 1:16. Moreover, VLPs immunized mice showed a rapid increase of neutralizing antibodies, with neutralizing antibody titers more than 1:8, which increased four-fold against PBS immunized mice in week four. By week six, the mice had high neutralization ability against the given strain and held a potent homologous virus neutralizing capacity. Thus, VLPs represent a potential strategy for the development of a safe and effective vaccine against novel avian influenza (H7N9) virus. View Full-Text
Keywords: H7N9 avian influenza; virus-like particles; vaccine; cross-reactivity; neutralizing antibodies H7N9 avian influenza; virus-like particles; vaccine; cross-reactivity; neutralizing antibodies
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Zhang, L.; Lu, J.; Chen, Y.; Shi, F.; Yu, H.; Huang, C.; Cui, L.; Shi, Z.; Jiao, Y.; Hu, Y. Characterization of Humoral Responses Induced by an H7N9 Influenza Virus-Like Particle Vaccine in BALB/C Mice. Viruses 2015, 7, 4369-4384.

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