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A Novel Vaccine Using Nanoparticle Platform to Present Immunogenic M2e against Avian Influenza Infection

DOI: 10.1155/2011/126794

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Abstract:

Using peptide nanoparticle technology, we have designed two novel vaccine constructs representing M2e in monomeric (Mono-M2e) and tetrameric (Tetra-M2e) forms. Groups of specific pathogen free (SPF) chickens were immunized intramuscularly with Mono-M2e or Tetra-M2e with and without an adjuvant. Two weeks after the second boost, chickens were challenged with 107.2 EID50 of H5N2 low pathogenicity avian influenza (LPAI) virus. M2e-specific antibody responses to each of the vaccine constructs were tested by ELISA. Vaccinated chickens exhibited increased M2e-specific IgG responses for each of the constructs as compared to a non-vaccinated group. However, the vaccine construct Tetra-M2e elicited a significantly higher antibody response when it was used with an adjuvant. On the other hand, virus neutralization assays indicated that immune protection is not by way of neutralizing antibodies. The level of protection was evaluated using quantitative real time PCR at 4, 6, and 8 days post-challenge with H5N2 LPAI by measuring virus shedding from trachea and cloaca. The Tetra-M2e with adjuvant offered statistically significant ( ) protection against subtype H5N2 LPAI by reduction of the AI virus shedding. The results suggest that the self-assembling polypeptide nanoparticle shows promise as a potential platform for a development of a vaccine against AI. 1. Introduction Avian influenza (AI) is a devastating poultry disease with serious economic consequences to the commercial poultry industry. AI is also a significant public health concern because of recent highly pathogenic H5N1 avian influenza outbreaks causing also human deaths in Asia, Europe, and North Africa. According to the world health organization (WHO) update, 2011, since 2003, 520 confirmed cases of human infection with H5N1 have been reported, of which 307 died due to disease complications. However, other avian influenza viruses including low-pathogenic avian influenza (LPAI) can also be a risk to public health. For instance, the LPAI subtype H9N2 infection in chickens is mild to asymptomatic and easily overlooked. However, it shares similar receptor binding epitopes with human influenza viruses and can infect humans [1]. There is a risk for LPAI subtypes H5 and H7 to become high-pathogenic avian influenza (HPAI) viruses in chickens due to constant virus shedding and transmission to new birds within the flock or neighboring flocks [2, 3]. Vaccination is an effective way for prevention of viral diseases in poultry. However, routine vaccination against AI has not been widely practiced throughout the world

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