Nasal mucosal administration of chitin microparticles boosts innate immunity against influenza A virus in the local pulmonary tissue.

The Edward Jenner Institute for Vaccine Research, Compton, RG20 7NN, United Kingdom.
Vaccine (Impact Factor: 3.49). 06/2010; 28(25):4130-7. DOI: 10.1016/j.vaccine.2010.04.026
Source: PubMed

ABSTRACT Influenza virus infection remains a major health concern due to morbidity and mortality associated with epidemics and occasional pandemics. The absence of acquired immunity to antigenically distinct, emerging virus strains stresses the need for a generic drug that protects independent of vaccination. Here, we demonstrate that prophylactic administration of chitin microparticles (CMP) via the intranasal route significantly reduced lung viral titres and clinical signs. Pre-treatment boosted the innate immune response to subsequent infection by recruiting innate cells, such as neutrophils, and increasing inflammatory cytokines. Although an increase in virus-specific T cells was observed, the memory phase was diminished. Our data demonstrate that in the absence of prior exposure to influenza virus, CMP reduce clinical signs by boosting innate immunity.

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