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The Journal of Immunology, 2004, 172: 3612-3619.
Copyright © 2004 by The American Association of Immunologists

Nasal Flt3 Ligand cDNA Elicits CD11c+CD8+ Dendritic Cells for Enhanced Mucosal Immunity1

Kosuke Kataoka*,{dagger}, Jerry R. McGhee*, Ryoki Kobayashi*, Keiko Fujihashi*, Satoshi Shizukuishi{dagger} and Kohtaro Fujihashi2,*

* Departments of Oral Biology and Microbiology, Immunobiology Vaccine Center, University of Alabama at Birmingham, Birmingham, AL 35294; and {dagger} Department of Preventive Dentistry, Graduate School of Dentistry, Osaka University, Suita, Osaka, Japan

Nasal immunization is an effective way to induce both mucosal and systemic immune responses. In this study, we assessed a cDNA vector for Flt3 ligand (FL) for its potential to enhance mucosal immunity or tolerance. Interestingly, tolerance was avoided and elevated levels of OVA-specific Ab responses were induced in nasal washes, fecal extracts, and saliva as well as in plasma when compared with mice given nasal OVA plus DNA plasmid without the FL gene. In addition, significant levels of OVA-specific CD4+ T cell proliferative responses and OVA-induced IL-4 and IL-2 production were noted in spleen and cervical lymph nodes. Further, marked increases in FL protein occurred in the nasal lamina propria and submandibular glands and the frequencies of CD11c+CD8+ dendritic cells (DCs) significantly increased in the mucosal tissues. Moreover, these DCs expressed high levels of CD40, CD80, CD86, and MHC class II molecules. Nasal delivery of plasmid FL with OVA resulted in FL expression in both mucosal inductive and effector sites and resulted in expanded activated lymphoid DCs. Thus, nasal plasmid FL prevents mucosal tolerance and enhances active immunity when given by a mucosal route.




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