IMMUNOGENICITY OF ATTENUATED MEASLES VIRUS ENGINEERED TO EXPRESS HELICOBACTER PYLORI NEUTROPHIL-ACTIVATING PROTEIN

Monday, 8th of September 2014 Print
[source]Vaccine[|source]

Reverse genetic techniques make insertion of foreign genes into MV genome possible and MV vectors expressing protective antigens have been tested in the development of vaccines against viral pathogens such as flaviviruses, hepatitis B and HIV.

In this study, the authors present the generation and immunogenicity testing of a recombinant NAP-encoding MV vaccine based on the attenuated Edmonston strain platform. The report documents that genetically modified attenuated MV strains engineered to express H. pylori protective antigens are able to induce significant humoral and cellular immune response against both MV and NAP transgene. Detailed findings and recommendations are accessible at: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3133491/

 

ABSTRACT

Helicobacter pylori is a Gram-negative, spiral-shaped microorganism associated with acute and chronic gastritis, peptic ulcer, gastric cancer and gastric lymphomas in humans. H. pylori neutrophil-activating protein (NAP) is a major virulence factor playing a central role in pathogenesis of mucosal inflammation by immune cell attraction and Th1 cytokine response polarization. NAP is protective antigen and promising vaccine candidate against H. pylori infection. Here we present the development of measles virus (MV) vaccine strain encoding the NAP antigen. In order to facilitate the extracellular transport and detection, NAP was inserted in the human lambda immunoglobulin chain replacing a major part of the variable domain. We generated two MV vectors expressing secretory NAP forms: MV-lambda-NAP encoding the full-length constant lambda light chain domain and MV-s-NAP encoding only the N-terminus of the lambda light chain with the leader peptide. Immunization of MV permissive Ifnarko-CD46Ge transgenic mice by a single intraperitoneal injection of the NAP-expressing strains induced a robust, long-term humoral and cellular immune response against MV. Nine months post vaccination measles-neutralizing antibody titers were above the serum level considered protective for humans. Furthermore, all animals immunized with MV strains expressing the secretory NAP antigen developed strong humoral immunity against NAP, reaching titers >1:10,000 within 2–4 weeks. IFN-γ ELISpot assay confirmed that NAP-encoding MV vectors can also stimulate NAP-specific cell-mediated immunity. Our data demonstrate that MV is an excellent vector platform for expression of bacterial antigens and development of vaccines for H. pylori immunoprophylaxis in humans.

Special Postings

What's New

Monday, 9th of March 2020

Monday, 9th of March 2020

Monday, 9th of March 2020

Monday, 9th of March 2020

Monday, 9th of March 2020
;

Highly Accessed

Website Views

47456537

External Links