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Intranasal immunization with influenza virus and Korean mistletoe lectin C (KML-C) induces heterosubtypic immunity in mice.

Song, Seong Kyu; Moldoveanu, Zina; Nguyen, Huan H; Kim, Eui Ho; Choi, Kwan Yong; Kim, Jong Bae; Mestecky, Jiri.
Vaccine ; 25(34): 6359-66, 2007 Aug 21.
Artigo Inglês | MEDLINE | ID: mdl-17640781
The mucosal adjuvanticity of Korean mistletoe lectin C (KML-C) was investigated in mice intranasally immunized with inactivated influenza virus (H1N1). Mucosal and systemic immune responses were compared to those induced with cholera toxin B subunit (CTB). KML-C increased influenza-specific antibodies with dominant IgG1 subclass in serum, IgG in genital secretions and IgA in saliva, and significantly enhanced influenza-specific lymphocyte proliferation and cytotoxic activity in spleens and in mediastinal lymph nodes. When KML-C was used as a mucosal adjuvant, mice were completely protected from mortality after the challenge with a homologous (H1N1) mouse-adapted influenza virus. After challenge with heterologous (H3N2) influenza virus the level of heterosubtypic immunity in KML-C-treated mice was comparable to that of mice that received CTB as adjuvant. These findings suggest that KML-C may be used as an effective mucosal adjuvant.