國家衛生研究院 NHRI:Item 3990099045/15768

NHRI > National Institute of Infectious Diseases and Vaccinology > Wang-Chou Sung > Periodical Articles > Item 3990099045/15768

Please use this identifier to cite or link to this item: http://ir.nhri.org.tw/handle/3990099045/15768

Title:	MDCK-adaptive mutation of A169S changes glycosylation pattern of hemagglutinin and rnhances MDCK-based H7N9 vaccine virus production without loss of antigenicity and immunogenicity
Authors:	Chen, PL;Weng, TC;Lai, CC;Tzeng, TT;Lin, MH;Hu, KC;Hu, AYC;Lee, MS;Sung, WC
Contributors:	National Institute of Infectious Diseases and Vaccinology
Abstract:	The adaptation of egg-derived H7N9 candidate vaccine virus (CVV) in the mammalian cell line is an approach to developing a high-growth virus strain for the mass production of vaccine manufacturing. The adaptive mutations that occur in hemagglutinin (HA) are critical to the activity and potency of the vaccine virus. Previously, we identified a new mutation of A169S in the HA protein of an MDCK-adapted H7N9 vaccine virus (A/Anhui/2013, RG268); however, whether and how this mutation affects vaccine potency remain to be investigated. In this study, we serially passaged RG268 in MDCK cells and found that the HA titer and the TCID50 of the passaged virus RG268-M5 were 4-fold (HA units/50 mu L) and 3.5-fold (log10 TCID50/mL) higher than those of the original CVV. By inspecting tandem MS spectra, we identified a new glycosylation site at N167 near the receptor binding site of the HA protein of RG268-M5. Flow cytometry results revealed that RG268-M5 could efficiently infect MDCK cells and initiate viral protein replication as well as that of RG268. Though the new glycosylation site is in the antigenic epitope of viral HA protein, the HI assay result indicated that the antigenicity of RG268-M5 was similar to RG268. Additionally, immunizing mice with RG268-M5 mixed aluminum hydroxide could induce potent antibody responses against the homologous and heterologous H7N9 viruses in vitro whereas the titers were comparable with those from the RG268 group. These results provide in-depth structural information regarding the effects of site-specific glycosylation on virus properties, which have implications for novel avian influenza vaccine development.
Date:	2024-03-11
Relation:	Vaccines. 2024 Mar 11;12(3):Article number 291.
Link to:	http://dx.doi.org/10.3390/vaccines12030291
JIF/Ranking 2023:	http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=NHRI&SrcApp=NHRI_IR&KeyISSN=2076-393X&DestApp=IC2JCR
Cited Times(WOS):	https://www.webofscience.com/wos/woscc/full-record/WOS:001192765300001
Cited Times(Scopus):	https://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85188926455
Appears in Collections:	[Wang-Chou Sung] Periodical Articles [Min-Shi Lee] Periodical Articles [Yung-Chih Hu] Periodical Articles [Tsai-Teng Tzeng] Periodical Articles

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