Abstract:
BACKGROUND:Highly pathogenic avian influenza A/H5N1 virus remains a potential pandemic threat, and it is essential to continue vaccine development against this subtype. A local mucosal immune response in the upper respiratory tract may stop influenza transmission. It is therefore important to develop effective intranasal pandemic influenza vaccines that induce mucosal immunity at the site of viral entry. OBJECTIVES:We evaluated the humoral and cellular immune responses of two promising mucosal adjuvants (Chitosan and c-di-GMP) for intranasal influenza H5N1 vaccine in a murine model. Furthermore, we evaluated the concept of co-adjuvanting an experimental adjuvant (c-di-GMP) with chitosan. METHODS:BALB/c mice were intranasally immunised with two doses of subunit NIBRG-14 (H5N1) vaccine (7·5, 1·5 or 0·3 μg haemagglutinin (HA) adjuvanted with chitosan (CSN), c-di-GMP or both adjuvants. RESULTS:All adjuvant formulations improved the serum and local antibody responses, with the highest responses observed in the 7·5 μg HA CSN and c-di-GMP-adjuvanted groups. The c-di-GMP provided dose sparing with protective single radial haemolysis (SRH), and haemagglutination inhibition (HI) antibody responses found in the 0·3 μg HA group. CSN elicited a Th2 response, whereas c-di-GMP induced higher frequencies of virus-specific CD4+T cells producing one or more Th1 cytokines (IFN-γ+, IL-2+, TNF-α+). A combination of the two adjuvants demonstrated effectiveness at 7·5 μg HA and triggered a more balanced Th cytokine profile. CONCLUSION:These data show that combining adjuvants can modulate the Th response and in combination with ongoing studies of adjuvanted intranasal vaccines will dictate the way forward for optimal mucosal influenza vaccines.
journal_name
Influenza Other Respir Virusesjournal_title
Influenza and other respiratory virusesauthors
Svindland SC,Pedersen GK,Pathirana RD,Bredholt G,Nøstbakken JK,Jul-Larsen Å,Guzmán CA,Montomoli E,Lapini G,Piccirella S,Jabbal-Gill I,Hinchcliffe M,Cox RJdoi
10.1111/irv.12056subject
Has Abstractpub_date
2013-11-01 00:00:00pages
1181-93issue
6eissn
1750-2640issn
1750-2659journal_volume
7pub_type
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pub_type: 临床试验,杂志文章,随机对照试验
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