Induction of mucosal immunity by intranasal application of a streptococcal surface protein antigen with the cholera toxin B subunit - PubMed (original) (raw)

Comparative Study

Induction of mucosal immunity by intranasal application of a streptococcal surface protein antigen with the cholera toxin B subunit

H Y Wu et al. Infect Immun. 1993 Jan.

Abstract

The level and distribution of isotype-specific antibodies in various secretions and of antibody-secreting cells in corresponding lymphoid organs and tissues were compared in mice immunized with Streptococcus mutans surface protein antigen I/II (AgI/II) conjugated to the cholera toxin B subunit (CTB), given intranasally (i.n.) or intragastrically (i.g.), with or without free cholera toxin (CT) as an adjuvant. Immunization i.n. induced stronger initial antibody responses to AgI/II in both serum and saliva than immunization i.g., but salivary immunoglobulin A (IgA)-specific antibody responses to immunization about 3 months later were not increased relative to total salivary IgA concentrations. Specific antibodies induced by i.n. immunization were as widely distributed in serum, saliva, tracheal wash, gut wash, and vaginal wash as those induced by i.g. immunization. Likewise, specific antibody-secreting cells were generated in the spleen, salivary glands, intestinal lamina propria, and mesenteric and cervical lymph nodes by either route of immunization. The strongest salivary IgA antibody response was induced by AgI/II-CTB conjugate given i.n., but the addition of CT did not further enhance it. However, free CTB could effectively replace CT as an adjuvant in i.n. immunization with unconjugated AgI/II. Booster i.n. immunization with AgI/II plus either free CT or CTB induced stronger recall serum antibody responses than conjugated AgI/II-CTB with or without CT as an adjuvant. Therefore, i.n. immunization with a protein antigen and free or coupled CTB is an effective means of generating IgA antibody responses expressed at several mucosal sites where protective immunity may be beneficial.

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Induction of mucosal immunity by intranasal application of a streptococcal surface protein antigen with the cholera toxin B subunit - PubMed (original) (raw)