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. 1991 Oct;59(10):3630–3638. doi: 10.1128/iai.59.10.3630-3638.1991

Host defense against cholera toxin is strongly CD4+ T cell dependent.

E Hörnqvist 1, T J Goldschmidt 1, R Holmdahl 1, N Lycke 1
PMCID: PMC258931  PMID: 1910010

Abstract

This study investigates the role of CD4+ T cells in host defense against cholera enterotoxin-induced diarrhea. Antitoxin immunoglobulin A formation and gut protection against cholera toxin (CT) following oral immunizations with CT were evaluated in normal mice and mice that had been depleted of CD4+ T cells by in vivo treatment with specific anti-CD4 monoclonal antibodies. Flow cytometer analysis demonstrated that anti-CD4 monoclonal antibody effectively eliminated CD4+ T cells in the spleen, mesenteric lymph nodes, and Peyer's patches. In contrast, lamina propria lymphocytes demonstrated only some decrease in CD4+ T-cell numbers following antibody treatment. However, CD4 expression of individual lamina propria lymphocytes was strongly down-regulated. Depletion of CD4+ T cells performed prior to oral immunization with CT completely inhibited the ability to respond to CT. No antitoxin production, as detected at the single-cell level by the ELISPOT technique, was found in the spleen, mesenteric lymph nodes, or Peyer's patches, nor did we observe serum antitoxin responses in these mice. Control mice demonstrated strong antitoxin responses in all locations following oral immunization with CT. Anti-CD4 antibody treatment also effectively inhibited the antitoxin immunoglobulin A response in the lamina propria to CT as well as blocked the ability to develop gut protection against CT challenge of ligated intestinal loops after oral CT immunization. Thus, in vivo CD4+ T-cell depletion rendered these mice unable to develop protective immunity in the gut following oral immunization with CT. Moreover, CD4+ T-cell depletion effectively inhibited the antitoxin immune response in the gut lamina propria, mesenteric lymph nodes, Peyer's patches, and spleen when performed prior to both priming and booster immunizations with CT. This study clearly demonstrates the requirement of functional CD4+ T cells in the gut immune system for the development of host defense against CT-induced disease. Our data also reinforce the concept of a strong association between gut protection against CT and local production of neutralizing immunoglobulin A antitoxin.

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Selected References

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