title: Oral administration of Lactococcus lactis expressing Helicobacter pylori Cag7-ct383 protein induces systemic anti-Cag7 immune response in mice.
abstract: To express the 3'-region (1152 bp) of the cag7 gene of Helicobacter pylori 51 strain, encoding the C-terminal 383 amino acid (ct383 aa) region of Cag7 protein that is known to cover the needle region of T4SS, in a live delivery vehicle Lactococcus lactis, the cag7-ct383 gene was amplified by PCR. DNA sequence analysis revealed that the amino acid sequence of Cag7-ct383 of H. pylori 51 shared 98.4% and 97.4% identity with H. pylori 26695 and J99, respectively. Intramuscular injection of the GST-Cag7-ct383 fusion protein into a rat could raise the anti-Cag7 antibody, indicating the immunogenicity of the Cag7-ct383 protein. When the cag7-ct383 gene was cloned in Escherichia coli-L. lactis shuttle vector (pMG36e) and transformed into L. lactis, the transformant could produce the Cag7-ct383 protein, as evidenced by Western blot analysis. The Cag7-ct383 protein level in the L. lactis transformant reached a maximum at the early stationary phase without extracellular secretion. The oral administration of the L. lactis transformant into mice generated anti-Cag7 antibody in serum in five of five mice. These results suggest that L. lactis transformant expressing Cag7-ct383 protein may be applicable as an oral vaccine to induce mucosal and systemic immunity to H. pylori.
authors.affiliation: School of Life Sciences and Biotechnology, College of Natural Sciences, Kyungpook National University, Daegu, Korea.
authors.forename: Su-Jung
authors.initials: SJ
authors.lastname: Kim
authors.forename: Ji Young
authors.initials: JY
authors.lastname: Lee
authors.forename: Do Youn
authors.initials: DY
authors.lastname: Jun
authors.forename: Jae-Young
authors.initials: JY
authors.lastname: Song
authors.forename: Woo-Kon
authors.initials: WK
authors.lastname: Lee
authors.forename: Myung-Je
authors.initials: MJ
authors.lastname: Cho
authors.forename: Young Ho
authors.initials: YH
authors.lastname: Kim
mesh_terms: D000284:Administration, Oral; D000595:Amino Acid Sequence; D000818:Animals; D000907:Antibodies, Bacterial / Q000097:blood; D001426:Bacterial Proteins / Q000235:genetics / Q000276:immunology*; D001428:Bacterial Vaccines / Q000008:administration & dosage / Q000235:genetics / Q000276:immunology*; D004269:DNA, Bacterial / Q000737:chemistry / Q000235:genetics; D005822:Genetic Vectors; D016481:Helicobacter Infections / Q000276:immunology / Q000517:prevention & control*; D016480:Helicobacter pylori / Q000235:genetics / Q000276:immunology*; D013294:Lactococcus lactis / Q000235:genetics*; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D008969:Molecular Sequence Data; D016133:Polymerase Chain Reaction / Q000379:methods; D051381:Rats; D017207:Rats, Sprague-Dawley; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid; D014614:Vaccines, Synthetic / Q000235:genetics / Q000276:immunology
chemical_list: D000907:Antibodies, Bacterial; D001426:Bacterial Proteins; D001428:Bacterial Vaccines; C119842:CAG7 protein, Helicobacter pylori; D004269:DNA, Bacterial; D014614:Vaccines, Synthetic