B subunits of cholera toxin and thermolabile enterotoxin of Escherichia coli have similar adjuvant effect as whole molecules on rotavirus 2/6-VLP specific antibody responses and induce a Th17-like response after intrarectal immunization. (December 2015)

• Record Type: Journal Article
• Authors: Thiam, Fatou; Charpilienne, Annie; Poncet, Didier; Kohli, Evelyne; Basset, Christelle
• Is Part Of: Microbial pathogenesis. Volume 89(2015)
• Page Start: 27
• Page End: 34
• Publication Date: 2015-12
• Subjects: Intrarectal -- Immunization -- B subunit -- Cholera toxin -- LT-R192G -- Rotavirus; Pathogenic microorganisms -- Periodicals; Pathology, Molecular -- Periodicals; Communicable Diseases -- microbiology -- Periodicals; Communicable Diseases -- parasitology -- Periodicals; Micro-organismes pathogènes -- Périodiques; Pathologie moléculaire -- Périodiques; Electronic journals; 616.9041
• DOI: 10.1016/j.micpath.2015.08.013
• Languages: English
• ISSNs: 0882-4010

Abstract

Abstract: The purpose of this study was to evaluate the adjuvant effect of the B subunits of cholera toxin (CT) and the thermolabile enterotoxin of Escherichia coli (LT) by the intrarectal route of immunization and compare them to the whole molecules CT and LT-R192G, a non toxic mutant of LT, using 2/6-VLP as an antigen, in mice. All molecules induced similar antigen specific antibody titers in serum and feces, whereas different T cell profiles were observed. CTB and LTB, conversely to CT and LT-R192G, did not induce detectable production of IL-2 by antigen specific T cells. Moreover, CTB, conversely to LT-R192G, CT and LTB, did not induce antigen specific CD4+CD25+Foxp3− and Foxp3+ T cells, thus showing different effects between the B subunits themselves. However, all molecules induced an antigen specific Th17 response. In conclusion, B subunits are potent adjuvants on B cell responses by the intrarectal route. Although their impact on T cell responses are different, all molecules induce a 2/6-VLP-specific Th17 T cell response that may play a major role in helping B cell responses and thus in adjuvanticity and protection. Graphical abstract: Highlights: CTB and LTB induce 2/6-VLP specific antibody responses similar to CT and LT-R192G. LT-R192G and CT but not their B subunits induce antigen specific IL-2 production. LT-R192G, CT and LTB induce antigen specific CD4+CD25+Foxp3− and Foxp3+ T cells. LT-R192G, CT and their B subunits all induce antigen specific Th17 response.