Abstract
Epitopes of a foot-and-mouth disease virus (FMDV) capsid protein VP1 complex and a chimera of 6xHis-tagged cholera toxin B subunit (hCTB) were expressed in Hansenula polymorpha and used together as a mucosal vaccine. Antibody and cytokine responses to VP1-hCTB vaccine and protection against FMDV were evaluated by ELISA and a virus challenge test in mice, respectively. VP1-hCTB directly enhanced the expression of interleukin-5 (IL-5) both in serum and supernatants of cultured spleen cells. After challenging suckling mice with 10(5) FMDV (=50% lethal dosage per mouse) a greater protection was seen after intraperitoneal and intranasal vaccinations than after oral vaccination. In swine immunized with VP1-hCTB, immune responses were achieved after three administrations, and the vaccine protected swine (80%) when challenged with 10(6.5) FMDV (=50% infectious dosage per swine). These results demonstrated the possibility of using CTB as a mucosal adjuvant to elicit protective immune responses against FMDV.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Adjuvants, Immunologic / administration & dosage
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Adjuvants, Immunologic / genetics
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Animals
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Antibodies, Viral / immunology*
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Capsid Proteins / administration & dosage
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Capsid Proteins / genetics
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Capsid Proteins / immunology
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Cells, Cultured
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Cholera Toxin / administration & dosage
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Cholera Toxin / genetics
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Cholera Toxin / immunology
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Female
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Foot-and-Mouth Disease / immunology*
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Foot-and-Mouth Disease / prevention & control
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Foot-and-Mouth Disease Virus / genetics
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Foot-and-Mouth Disease Virus / immunology*
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Immunity, Mucosal*
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Interleukin-5 / immunology
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Mice
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Mice, Inbred BALB C
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Recombinant Fusion Proteins / administration & dosage
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Recombinant Fusion Proteins / genetics
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Recombinant Fusion Proteins / immunology
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Spleen / cytology
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Spleen / immunology
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Swine
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Viral Vaccines / administration & dosage
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Viral Vaccines / immunology*
Substances
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Adjuvants, Immunologic
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Antibodies, Viral
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Capsid Proteins
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Interleukin-5
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Recombinant Fusion Proteins
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VP1 protein, Foot-and-mouth disease virus
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Viral Vaccines
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Cholera Toxin