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Open AccessArticle

Use of PELC/CpG Adjuvant for Intranasal Immunization with Recombinant Hemagglutinin to Develop H7N9 Mucosal Vaccine

Institute of Biotechnology, National Tsing Hua University, Hsinchu 30013, Taiwan
Department of Internal Medicine, MacKay Memorial Hospital, Hsinchu 30071, Taiwan
Teaching Center of Natural Science, Minghsin University of Science and Technology, Hsinchu 30401, Taiwan
National Institute of Infectious Diseases and Vaccinology, National Health Research Institutes, Zhunan 35053, Taiwan
Department of Food Science, National Taiwan Ocean University, Keelung 20224, Taiwan
Genomics Research Center, Academia Sinica, Taipei 11529, Taiwan
Department of Medical Science, National Tsing Hua University, Hsinchu 30013, Taiwan
Author to whom correspondence should be addressed.
These authors contributed equally for this work.
Vaccines 2020, 8(2), 240;
Received: 30 April 2020 / Revised: 12 May 2020 / Accepted: 20 May 2020 / Published: 21 May 2020
(This article belongs to the Special Issue Vaccinology of Influenza Infection)
Human infections with H7N9 avian influenza A virus can result in severe diseases with high mortality. Developing an effective vaccine is urgently needed to prevent its pandemic potential. Vaccine delivery routes via mucosal surfaces are known to elicit mucosal immune responses such as secretory IgA antibodies in mucosal fluids, thus providing first-line protection at infection sites. PEG-b-PLACL (PELC) is a squalene-based oil-in-water emulsion adjuvant system that can enhance antigen penetration and uptake in nasal mucosal layers with enhanced mucin interactions. In this study, intranasal immunizations with recombinant H7 (rH7) proteins with a PELC/CpG adjuvant, as compared to the use of poly (I:C) or bacterial flagellin adjuvant, elicited higher titers of H7-specific IgG, IgA, hemagglutination inhibition, and neutralizing antibodies in sera, and increased numbers of H7-specific IgG- and IgA-antibody secreting cells in the spleen. Both PELC/CpG and poly (I:C) adjuvants at a dose as low as 5 μg HA provided an 80% survival rate against live virus challenges, but a lower degree of PELC/CpG-induced Th17 responses was observed. Therefore, the mucosal delivery of rH7 proteins formulated in a PELC/CpG adjuvant can be used for H7N9 mucosal vaccine development. View Full-Text
Keywords: H7N9; intranasal; adjuvant; mucosal vaccine H7N9; intranasal; adjuvant; mucosal vaccine
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Chen, T.-H.; Chen, C.-C.; Huang, M.-H.; Huang, C.-H.; Jan, J.-T.; Wu, S.-C. Use of PELC/CpG Adjuvant for Intranasal Immunization with Recombinant Hemagglutinin to Develop H7N9 Mucosal Vaccine. Vaccines 2020, 8, 240.

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