Biomolecules & Therapeutics

The Korean Society of Applied Pharmacology (한국응용약물학회)
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Induction of a systemic IgG and secretory IgA responses in mice by peroral immunization with uropathogenic Escherichia coli adhesin protein coupled to cholera toxin A2B subunits

  • Lee, Yong-Hwa (Division of Immunopharmacology, College of Pharmacy, SungKyunKwan University) ;
  • Kim, Byung-Oh (Division of Immunopharmacology, College of Pharmacy, SungKyunKwan University) ;
  • Rhee, Dong-Kwon (Division of Immunopharmacology, College of Pharmacy, SungKyunKwan University) ;
  • Pyo, Suh-Kneung (Division of Immunopharmacology, College of Pharmacy, SungKyunKwan University)
  • Published : 2003.09.01
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Abstract

The generation of secretory IgA antibodies(Abs) for specific immune protection of mucosal surfaces depends on stimulation of the mucosal immune system, but this is not effectively achieved by parenteral or even oral administration of most soluble antigens. Thus, to produce a possible vaccine antigen against urinary tract infections, the uropathogenic E. coli (UPEC) adhesin was genetically coupled to the ctxa2b gene and cloned into a pMAL-p2E expression vector. The chimeric construction of pMALfimHIctxa2b was then transformed into E. coli K-12 TB1 and its nucleotide sequence was verified. The chimeric protein was then purified by applying the affinity chromatography. The purified chimeric protein was confirmed by SDS-PAGE and western blotting using antibodies to the maltose binding protein (MBP) or the cholera toxin subunit B (CTXB), plus the N-terminal amino acid sequence was analyzed. The orderly-assembled chimeric protein was confirmed by a modified $G_{M1}$-ganglioside ELISA using antibodies to adhesin. The results indicate that the purified chimeric protein was an Adhesin/CTXA2B protein containing UPEC adhesin and the $G_{M1}$-ganglioside binding activity of CTXB. This study also demonstrate that peroral administration of this chimeric immunogen in mice elicited high level of secretory IgA and serum IgG Abs to the UPEC adhesin. The results suggest that the genetically linked CTXA2B acts as a useful mucosal adjuvant, and that the adhesin/CTXA2B chimeric protein might be a potential antigen for oral immunization against UPEC.

Keywords

References

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