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Adjuvant for mucosal vaccine

a technology for mucosal vaccine and adjuvant, which is applied in the direction of antibody medical ingredients, carrier-bound antigen/hapten ingredients, and immunodeficiency disorders, etc., can solve the problems of ct or lt development of mucosal adjuvants that are difficult in terms of safety, and are satisfactory for mucosal adjuvants in terms of safety

Inactive Publication Date: 2015-10-29
DAIICHI SANKYO CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides an adjuvant for mucosal vaccines that is safe and effective. The inventors discovered that a combination of hemagglutinin (HA) and ovalbumin or influenza HA antigens can boost the production of serum and secretory antibodies, suggesting that HA enhances both systemic and mucosal immunity. When this adjuvant is used with mucosal vaccines, it can accelerate the production of antibodies on the mucosal surface and enhance overall immunity against diseases of the respiratory or digestive apparatus. Additionally, the use of HA as an adjuvant is safe because it does not activate innate immunity or cause inflammation on the mucosal surface.

Problems solved by technology

However, because mucosal vaccines with antigens alone are not capable of inducing sufficient immune responses, mucosal adjuvants for mucosal vaccines is necessary in order to induce effective immune responses on the mucosal surface.
However, previous reports showed that clinical trials with LT intranasal administration caused facial nerve palsy (Bell's palsy).
Accordingly, development of mucosal adjuvants with toxins such as CT or LT might be difficult in terms of safety.
However, since those candidates induce excessive inflammatory responses, they are not satisfactory for mucosal adjuvants in terms of safety.
That is, no effective and safe adjuvants for mucosal vaccines are being put to practical use at present.
Botulinum toxin blocks neuron transmission, and leads to death in human.
While the functions of the neurotoxin complex (HA to which the toxin component has been bound) to breach the intestinal epithelial barrier have been investigated in the study described above, interaction of toxin-free HA with M cells or adjuvant effects for delivering vaccine antigens for mucosal vaccines to infectious diseases have not yet been examined.

Method used

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  • Adjuvant for mucosal vaccine
  • Adjuvant for mucosal vaccine
  • Adjuvant for mucosal vaccine

Examples

Experimental program
Comparison scheme
Effect test

example 1

Preparation of Botulinus HA (BHA) Complex

[0053]The botulinus HA (BHA) complex was prepared in the manner described below.

(1) Preparation of Plasmids

[0054]The genes encoding the proteins of the botulinus HA subcomponents (BHA1, BHA2, and BHA3) (BHA1: a protein consisting of amino acids 7 to 294 of the amino acid sequence as shown in SEQ ID NO: 1; BHA2: a protein consisting of amino acids 2 to 146 of the amino acid sequence as shown in SEQ ID NO: 2; and BHA3: a protein consisting of amino acids 19 to 626 of the amino acid sequence as shown in SEQ ID NO: 3) were amplified by PCR from genomic DNA of the Clostridium botulinum B-Okra strain as a template using the primers described below.

(Primers for BHA1 Amplification)

[0055]

(SEQ ID NO: 9)BHA1 forward primer:cactataagcttatccaaaattcattaaatg(SEQ ID NO: 10)BHA1 reverse primer:gttgataggtaccttatgggttactcatag

(Primers for BHA2 Amplification)

[0056]

BHA forward primer:(SEQ ID NO: 11)tgaataagctttcagctgaaagaacttttcBHA2 reverse primer:(SEQ ID NO: 12)c...

example 2

Interaction Between M Cell and Botulinus HA Subcomponent Alone or Complex of Botulinus HA Subcomponents

[0063]HA1, HA2, and HA3 of botulinus type A (600 nM each) were labeled with Alexa 568 and injected into ligated intestinal loop of the mouse. Two hours later, HA subcomponent localization was observed under a confocal microscope. M cells were stained with FITC-labeled UEA-1. Neither M-cell binding nor transcytosis was substantially observed as a result when HA1, HA2, or HA3 alone was used (FIG. 3).

[0064]Separately, the HA213 complex and the HA1+2+3 complex of botulinus type A (600 nM each) were labeled with Alexa 568 and injected into ligated intestinal loop of the mouse. Two hours later, localization of complexes was observed under a confocal microscope. M cells were stained with FITC-labeled UEA-1. Neither M-cell binding nor transcytosis was substantially observed as a result when the HA2+3 complex was used. As with the case of native 16S toxin. M-cell binding and transcytosis we...

example 3

Nasal Adjuvant Effects of BHA Complex Using Ovalbumin (OVA)

[0065]With the use of model antigens (ovalbumin, OVA), the efficacy of botulinus HA (BHA) as a mucosal vaccine adjuvant was inspected in the mouse with intranasal administration system. The BHA complex (BHA) prepared in Example 1 was used as BHA. OVA (5 μg only), OVA (5 μg)+BHA (15 μg), and OVA (5 μg)+cholera toxin B subunit (2 μg) (as the positive control) were intranasally administered to BALB / c mice (6-week-old: a group of 3 individuals) at intervals of one week (at day 0, day 7, day 14, day 21, and day 28), and five times of administration was totally carried out. Production of OVA-specific IgG in the sera, that of OVA-specific IgA in the nasal cavity lavage, and that of OVA-specific IgA in bronchoalveolar lavage were assayed by ELISA on day 34.

[0066]The results are shown in FIG. 5. Production of IgA was not observed in any nasal cavity lavage or bronchoalveolar lavage in the group to which OVA alone had been administere...

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Abstract

An object of the present invention is to provide an adjuvant for a mucosal vaccine with high safety that induces a sufficient immune response on the mucosa. According to the present invention, an adjuvant for a mucosal vaccine comprising a protein complex composed of hemagglutinin (HA) subcomponents HA1, HA2, and HA3 of botulinum toxin is provided.

Description

TECHNICAL FIELD[0001]The present invention relates to an effective and safe adjuvant for a mucosal vaccine and a mucosal vaccine preparation containing such adjuvant and vaccine antigens.BACKGROUND ART[0002]In recent years, the mechanisms of mucosal immunity on the respiratory apparatus, the digestive apparatus, the reproductive organs, and other organs have been gradually elucidated as the immune system to prevent infectious diseases such as influenza or acquired immunodeficiency syndrome (AIDS). For example, immune response to prevent influenza virus infection is associated with mucosal IgA antibody, serum IgG antibody to neutralize the viruses, and cytotoxic T cells that lyse infected cells to interrupt virus transmission. Such mucosal immune mechanisms are functional at the initial phase of infection, and play a key role in biophylaxis at the time of infection or during the initial phase of infection. Accordingly, mucosal vaccines inducing immune protection response against infe...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61K39/39A61K39/145
CPCA61K39/39A61K2039/543A61K2039/55516A61K39/145A61K39/02A61K39/12C07K14/33A61K2039/5252A61K2039/55544C12N2760/16134C07K14/77C07K2319/42A61K39/00A61P31/00A61P37/04Y02A50/30A61K2039/541A61K2039/575C12N7/00
Inventor FUJINAGA, YUKAKOMATSUMURA, TAKUHIROYUTANI, MASAHIROJONAI, NAO
Owner DAIICHI SANKYO CO LTD
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