Abstract：
:The development of a vaccine for Helicobacter pylori is a key strategy for reducing the worldwide prevalence of H. pylori infection. Although immunization with recombinant B subunit of H. pylori urease (ureB) has yielded promising results, for the most part, these studies relied on the use of strong adjuvant, cholera toxin, precluding the use in humans. Thus, the development of new vaccine strategies for H. pylori is essential. Previous studies from our laboratory have described a vaccine vector based on poliovirus in which foreign genes are substituted for the poliovirus capsid genes. The genomes encoding foreign proteins (replicons) are encapsidated into authentic poliovirions by providing the capsids in trans. To test the utility of replicons as a vaccine vector for H. pylori, a replicon was constructed which encodes ureB. Expression of ureB in cells from the replicon was demonstrated by metabolic labeling followed by immunoprecipitation with anti-urease antibodies. To investigate the immunogenicity of the replicons, mice containing the transgene for the receptor for poliovirus were immunized via the intramuscular route. Mice given three doses of replicons did not develop substantial antibodies to ureB as determined by Western blot analysis using lysates from H. pylori. In contrast, mice given two doses of replicon followed by a single injection of recombinant ureB developed serum antibodies to ureB which were predominately IgG2a. Splenic lymphocytes from mice immunized with replicons alone, or replicons plus recombinant ureB produced abundant interferon-gamma and no detectable interleukin-4 upon stimulation with recombinant ureB. These results establish that poliovirus replicons encoding H. pylori ureB are immunogenic and induce primarily a T helper 1 associated immune response.
journal_name
Vaccinejournal_title
Vaccineauthors
Novak MJ,Smythies LE,McPherson SA,Smith PD,Morrow CDdoi
10.1016/s0264-410x(99)00035-3subject
Has Abstractpub_date
1999-05-14 00:00:00pages
2384-91issue
19eissn
0264-410Xissn
1873-2518pii
S0264410X99000353journal_volume
17pub_type
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