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Open Access Short report

Membrane-bound IL-12 and IL-23 serve as potent mucosal adjuvants when co-presented on whole inactivated influenza vaccines

Tila Khan1, Connie L Heffron1, Kevin P High2 and Paul C Roberts1*

Author Affiliations

1 Department of Biomedical Sciences and Pathobiology, 1981 Kraft Drive, Corporate Research Center, Virginia Tech, Blacksburg, Virginia 24061, USA

2 Section on Infectious Diseases, Department of Internal Medicine, Wake Forest University School of Medicine, 100 Medical Center Boulevard, Winston-Salem, NC 27157-1042, USA

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Virology Journal 2014, 11:78  doi:10.1186/1743-422X-11-78

Published: 3 May 2014

Abstract

Background

Potent and safe adjuvants are needed to improve the efficacy of parenteral and mucosal vaccines. Cytokines, chemokines and growth factors have all proven to be effective immunomodulatory adjuvants when administered with a variety of antigens. We have previously evaluated the efficacy of membrane-anchored interleukins (IL) such as IL-2 and IL-4 co-presented as Cytokine-bearing Influenza Vaccines (CYT-IVACs) using a mouse model of influenza challenge.

Findings

Here, we describe studies evaluating the parenteral and mucosal adjuvanticity of membrane-bound IL-12 and IL-23 CYT-IVACs in young adult mice. Mucosal immunization using IL-12 and IL-23 bearing whole influenza virus vaccine (WIV) was more effective at eliciting virus-specific nasal IgA and reducing viral lung burden following challenge compared to control WIV vaccinated animals. Both IL-12 and IL-23 bearing WIV elicited the highest anti-viral IgA levels in serum and nasal washes.

Conclusions

This study highlights for the first time the mucosal adjuvant potential of IL-12 and IL-23 CYT-IVAC formulations in eliciting mucosal immune responses and reducing viral lung burden. The co-presentation of immunomodulators in direct context with viral antigen in whole inactivated viral vaccines may provide a means to significantly lower the dose of vaccine required for protection.

Keywords:
Influenza; Whole inactivated virus vaccine; Adjuvant; Cytokine; IL-12; IL-23