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

Microbial Pathogenesis
Fatou ThiamChristelle Basset

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.

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Citations

Aug 29, 2019·Frontiers in Cellular and Infection Microbiology·Qiangde DuanGuoqiang Zhu
Nov 2, 2019·Immunology Letters·Miao LiHua-Ji Qiu
Feb 27, 2021·Journal of Nanobiotechnology·Saghi NooraeiGholamreza Ahmadian
Aug 7, 2017·Clinical Immunology : the Official Journal of the Clinical Immunology Society·Velasco Cimica, Jose M Galarza
Jul 22, 2021·Human Vaccines & Immunotherapeutics·G G Guerrero Manriquez, I Tuero

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