Mucosal adjuvant effect of cholera toxin in mice results from induction of T helper 2 (Th2) cells and IL-4

J Immunol. 1995 Nov 15;155(10):4621-9.

Abstract

Despite pathophysiologic effects including diarrhea, cholera toxin (CT) is a potent mucosal immunogen and adjuvant. We investigated the influence of CT on T helper (Th)-type 1 (Th1) and Th2 cell-regulated Ag-specific B cell isotype and IgG subclass Ab responses elicited when the toxin was co-administered orally with different protein Ags. When mice were orally immunized with tetanus toxoid (TT) and CT as adjuvant, this regimen induced TT-specific secretory IgA responses in the gastrointestinal tract as well as serum IgG, including IgG1 and IgG2b subclasses, and IgA responses. This oral regimen also induced TT- and CT-B-specific IgE responses. In addition, CT also elicited adjuvant effects for Ag-specific IgG1, IgE, and IgA responses when two other protein Ags, OVA and hen egg white lysozyme, were given by the oral route. Quantitative reverse transcriptase-PCR was performed to assess levels of mRNA for Th1 (IFN-gamma) and Th2 (IL-4) cytokine expression in TT-stimulated CD4+ T cell cultures. Both Peyer's patches and splenic CD4+ T cells expressed markedly increased levels of IL-4-specific message, but did not result in changes in IFN-gamma mRNA expression. To determine whether the route of immunization influenced IgE responses, mice were immunized s.c. with TT and CT as adjuvant. Significant increases in total and TT-specific IgE Abs were induced when CT was co-administered. Taken together, these results show that CT acts as a mucosal adjuvant to enhance Th2-type responses and in particular, the IL-4 produced results in a characteristic Ab isotype pattern associated with this cytokine.

Publication types

  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Adjuvants, Immunologic*
  • Administration, Oral
  • Animals
  • Antibody Formation
  • Cholera Toxin / immunology*
  • Cholera Toxin / pharmacology
  • Immunity, Mucosal*
  • Immunoglobulins / analysis
  • Interleukin-4 / immunology*
  • Lymphocyte Activation / drug effects
  • Mice
  • Mice, Inbred C57BL
  • Mice, Knockout
  • Muramidase / immunology
  • Ovum / immunology
  • Tetanus Toxoid / immunology
  • Tetanus Toxoid / pharmacology
  • Th2 Cells / immunology*

Substances

  • Adjuvants, Immunologic
  • Immunoglobulins
  • Tetanus Toxoid
  • Interleukin-4
  • Cholera Toxin
  • Muramidase