期刊
JOURNAL OF ORAL SCIENCE
卷 55, 期 2, 页码 107-114出版社
NIHON UNIV, SCHOOL DENTISTRY
DOI: 10.2334/josnusd.55.107
关键词
cholera toxin; nasal immunization; outer membrane protein; Porphyromonas gingivalis; T helper cells
资金
- Japan Society for the Promotion of Science [22390398]
- Japan [MEXT] [2010-2014 [S1001024]]
Previous studies have demonstrated that nasal administration of the outer membrane protein of Porphyromonas gingivalis (40k-OMP) with cholera toxin (CT) as an adjuvant elicits protective immune responses against P. gingivalis in young mice. In the present study, we investigated whether administration of 40k-OMP plus CT would also induce 40k-OMP-specific antibody (Ab) responses to provide protective immunity against P. gingivalis infection in aged mice. Nasal immunization with 40k-OMP plus CT elicited 40k-OMP-specific IgG and IgA Ab responses in serum and a significant anti-40k-OMP IgA Ab response in nasal washes and saliva in 1-and 2-year-old mice. Furthermore, both Th1-and Th2-type cytokine responses were induced by the immunization, and cytokine-associated IgG1, IgG2a, and IgG2b Ab responses were observed in the spleens of aged mice. Although the aged mice showed lower 40k-OMP-specific Ab responses than young mice, their mucosal IgA Ab titers as well as serum IgG Ab responses indicated a retained ability to mediate protective immunity; the only exception was saliva in 2-year-old mice. These findings suggest that nasal immunization with 40k-OMP plus CT can be a potential vaccination strategy for eliciting levels of Abs sufficient to provide protective immunity against P. gingivalis infection in aged mice.
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