Intranasal vaccination with a replication-deficient influenza virus induces heterosubtypic neutralising mucosal IgA antibodies in humans
Identifieur interne : 001D05 ( PascalFrancis/Curation ); précédent : 001D04; suivant : 001D06Intranasal vaccination with a replication-deficient influenza virus induces heterosubtypic neutralising mucosal IgA antibodies in humans
Auteurs : A. Morokutti [Autriche] ; T. Muster [Autriche] ; B. Ferko [Autriche]Source :
- Vaccine [ 0264-410X ] ; 2014.
Descripteurs français
- Pascal (Inist)
- Wicri :
- topic : Homme, Vaccination, Vaccin.
English descriptors
- KwdEn :
Abstract
We investigated the cross-neutralising potential of serum and nasal wash samples from volunteers who were intranasally immunised once with a monovalent replication-deficient deINS1-H1N1 influenza virus vaccine (7.7 log10 TCID50/volunteer). Eight out of twelve (8/12) vaccinees responded to vaccination with a significant increase of antibody levels in serum IgG ELISA, mucosal IgA ELISA, MNA or HAI. Four responders showed deINS1-specific ELISA IgA increases and revealed excellent homosubtypic neutralising activity in serum and mucosal washings (4/4). However, 0/4 of the sera but 3/4 of the nasal washings neutralised also heterosubtypic H3N2 and H5N1 influenza viruses. Depletion experiments proved that IgA but not IgG is responsible for the cross-neutralising activity of the nasal wash sample. Our findings indicate that the induction of virus-neutralising IgA may represent a valuable correlate of cross-protection of intranasal influenza vaccines and that the deINS1 concept constitutes a promising approach to protect humans from seasonal and pandemic influenza threats.
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<front><div type="abstract" xml:lang="en">We investigated the cross-neutralising potential of serum and nasal wash samples from volunteers who were intranasally immunised once with a monovalent replication-deficient deINS1-H1N1 influenza virus vaccine (7.7 log<sub>10</sub>
TCID<sub>50</sub>
/volunteer). Eight out of twelve (8/12) vaccinees responded to vaccination with a significant increase of antibody levels in serum IgG ELISA, mucosal IgA ELISA, MNA or HAI. Four responders showed deINS1-specific ELISA IgA increases and revealed excellent homosubtypic neutralising activity in serum and mucosal washings (4/4). However, 0/4 of the sera but 3/4 of the nasal washings neutralised also heterosubtypic H3N2 and H5N1 influenza viruses. Depletion experiments proved that IgA but not IgG is responsible for the cross-neutralising activity of the nasal wash sample. Our findings indicate that the induction of virus-neutralising IgA may represent a valuable correlate of cross-protection of intranasal influenza vaccines and that the deINS1 concept constitutes a promising approach to protect humans from seasonal and pandemic influenza threats.</div>
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