Co-administered tag-less toxoid fusion 3xSTaN12S-mnLTR192G/L211A and CFA/I/II/IV MEFA (Multiepitope Fusion Antigen) induce neutralizing antibodies to 7 adhesins (CFA/I, CS1-CS6) and both enterotoxins (LT, STa) of Enterotoxigenic Escherichia coli (ETEC)

Qiangde Duan, Ti Lu, Carolina Garcia, Coraima Yañez, Rahul M. Nandre, David A. Sack, Weiping Zhang

Research output: Contribution to journalArticlepeer-review

Abstract

Enterotoxigenic Escherichia coli (ETEC) bacteria remain a leading cause of children's diarrhea and travelers' diarrhea. Vaccines that induce antibodies to block ETEC bacterial adherence and to neutralize toxin enterotoxicity can be effective against ETEC-associated diarrhea. Recent studies showed that 6xHis-tagged CFA/I/II/IV multiepitope fusion antigen (MEFA) induced broad-spectrum antibodies to inhibit adherence of the seven most important ETEC adhesins (CFA/I, CS1 to CS6) (Ruan et al., 2014a) and 6xHis-tagged toxoid fusion antigen 3xSTaN12S-mnLTR192G/L211A (previously named as 3xSTaN12S-dmLT) elicited antibodies to neutralize both heat-labile toxin (LT) and heat-stable toxin (STa) produced by ETEC strains (Ruan et al., 2014b). In this study, we constructed two new genes to express tag-less toxoid fusion 3xSTaN12S-mnLTR192G/L211A and tag-less CFA/I/II/IV MEFA and then examined immunogenicity of each tag-less protein in mouse immunization. We further combined two tag-less proteins and investigated antigen co-administration in mice. Data showed that mice immunized with tag-less 3xSTaN12S-mnLTR192G/L211A or tag-less CFA/I/II/IV MEFA developed antigen-specific IgG antibody responses, and mice co-administered with two tag-less proteins induced neutralizing antibodies against seven adhesins and both toxins. These results indicated tag-less toxoid fusion 3xSTaN12S-mnLTR192G/L211A and tag-less CFA/I/II/IV MEFA administered individually or combined induced neutralizing antitoxin and/or anti-adhesin antibodies, and suggested the potential application of two tag-less proteins for ETEC vaccine development.

Original languageEnglish (US)
Article number1198
JournalFrontiers in Microbiology
Volume9
Issue numberJUN
DOIs
StatePublished - Jun 5 2018

Keywords

  • Antibody
  • Diarrhea
  • ETEC (enterotoxigenic Escherichia coli)
  • MEFA (multiepitope fusion antigen)
  • Toxoid fusion
  • Vaccine

ASJC Scopus subject areas

  • Microbiology
  • Microbiology (medical)

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