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. 1992 Mar;75(3):493–498.

Involvement of antigen-presenting cells in the enhancement of the in vitro antibody responses by cholera toxin B subunit.

Y Hirabayashi 1, S I Tamura 1, K Shimada 1, T Kurata 1
PMCID: PMC1384745  PMID: 1374056

Abstract

The enhancing effect of cholera toxin B subunit (CTB) on primary antibody responses to keyhole limpet haemocyanin (KLH) and the cellular basis of the effect were investigated, using in vitro cultures of mouse spleen cells. CTB (1-100 ng/ml) enhanced anti-KLH IgM, IgG and IgA antibody responses in a dose-dependent manner, when added to the cultures with KLH. This immunoenhancement was antigen specific, but not due to either polyclonal activation of the spleen cells or antigenic cross-reactivity between CTB and KLH. CTB did not affect the kinetics of the anti-KLH antibody responses. Early (Days 0-1) addition of CTB to the cultures enhanced the anti-KLH antibody production, whereas late (Days 5-7) addition of CTB did not. Addition of CTB with KLH to splenic adherent cells (SAC) resulted in a dose-dependent enhancement of the anti-KLH antibody responses, when the SAC were reconstituted with unimmunized non-adherent cells. Moreover, CTB enhanced IL-1 secretion from SAC incubated with KLH. These results suggest that CTB enhances the primary anti-KLH antibody responses in vitro by acting on early events in the responses, and that antigen-presenting cells play a major role in the enhancement.

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Selected References

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