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. 1988 May;64(1):135–139.

Suppression of an established DTH response to ovalbumin in mice by feeding antigen after immunization.

A G Lamont 1, M G Bruce 1, K C Watret 1, A Ferguson 1
PMCID: PMC1385198  PMID: 3384449

Abstract

Experiments were designed to examine whether systemic delayed-type hypersensitivity responses (DTH) to ovalbumin (OVA) can be suppressed when antigen is fed after immunization, and to investigate the immunological mechanisms involved. A single 25 mg feed of OVA given 7 or 14 days after immunization with OVA in complete Freund's adjuvant (CFA) suppressed the DTH response of BDF1 mice, but had no significant effect on the serum IgG antibody response. DTH suppression was greatest when antigen was fed soon after immunization, and became less pronounced as the time interval between feeding and immunization increased. The phenomenon was also demonstrated in mice of the BALB/c strain. Cell transfer experiments suggested that the post-immunization suppression was not due to a population of suppressor cells that have been described previously in association with classical oral tolerance for DTH. We conclude that there are separate and distinct mechanisms for the prevention of induction of DTH by antigen feeding in naive mice and the suppression of expression of DTH in sensitized animals.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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