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Intranasal vaccination with a replication-deficient influenza virus induces heterosubtypic neutralising mucosal IgA antibodies in humans

Identifieur interne : 001D05 ( PascalFrancis/Curation ); précédent : 001D04; suivant : 001D06

Intranasal 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 :

RBID : Pascal:14-0118326

Descripteurs français

English descriptors

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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C01 01    ENG  @0 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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C07 01  X  SPA  @0 Influenzavirus A @2 NW
C07 02  X  FRE  @0 Orthomyxoviridae @2 NW
C07 02  X  ENG  @0 Orthomyxoviridae @2 NW
C07 02  X  SPA  @0 Orthomyxoviridae @2 NW
C07 03  X  FRE  @0 Virus @2 NW
C07 03  X  ENG  @0 Virus @2 NW
C07 03  X  SPA  @0 Virus @2 NW
N21       @1 153
N44 01      @1 OTO
N82       @1 OTO

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Pascal:14-0118326

Le document en format XML

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<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
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   |texte=   Intranasal vaccination with a replication-deficient influenza virus induces heterosubtypic neutralising mucosal IgA antibodies in humans
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