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Prophylactic immunization to Helicobacter pylori infection using spore vectored vaccines.

Published version

Published version
Peer-reviewed

Repository DOI


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Authors

Katsande, Paidamoyo M  ORCID logo  https://orcid.org/0000-0001-6259-0665
Nguyen, Van Duy 
Nguyen, Thi Lan Phuong 
Nguyen, Thi Kim Cuc 
Mills, Gabrielle 

Abstract

BACKGROUND: Helicobacter pylori infection remains a major public health threat leading to gastrointestinal illness and increased risk of gastric cancer. Mostly affecting populations in developing countries no vaccines are yet available and the disease is controlled by antimicrobials which, in turn, are driving the emergence of AMR. MATERIALS AND METHODS: We have engineered spores of Bacillus subtilis to display putative H. pylori protective antigens, urease subunit A (UreA) and subunit B (UreB) on the spore surface. Following oral dosing of mice with these spores, we evaluated immunity and colonization in animals challenged with H. pylori. RESULTS: Oral immunization with spores expressing either UreA or UreB showed antigen-specific mucosal responses (fecal sIgA) including seroconversion and hyperimmunity. Following challenge, colonization by H. pylori was significantly reduced by up to 1-log. CONCLUSIONS: This study demonstrates the utility of bacterial spores for mucosal vaccination to H. pylori infection. The heat stability and robustness of Bacillus spores coupled with their existing use as probiotics make them an attractive solution for either protection against H. pylori infection or potentially for therapy and control of active infection.

Description

Funder: Newton Fund program on Infectious Diseases

Keywords

Helicobacter pylori infection, oral and parenteral immunization, vaccine, Animals, Mice, Helicobacter pylori, Helicobacter Infections, Bacterial Vaccines, Urease, Immunization, Vaccination, Antigens, Bacterial, Spores, Mice, Inbred BALB C, Antibodies, Bacterial

Journal Title

Helicobacter

Conference Name

Journal ISSN

1083-4389
1523-5378

Volume Title

Publisher

Wiley
Sponsorship
UK Medical Research Council (MRC) (MR/R026262/1)
Vietnam Ministry of Science & Technology (MOST) (NDT.79.GB/20)