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. 1995 Sep;86(1):128–133.

Bystander suppression of the immune response to human serum albumin in rats fed ovalbumin.

A Dahlman-Höglund 1, U Dahlgren 1, S Ahlstedt 1, L A Hanson 1, E Telemo 1
PMCID: PMC1383820  PMID: 7590873

Abstract

Bystander suppression of delayed-type hypersensitivity (DTH) and the antibody response to human serum albumin (HSA) were studied in young normal rats and in young rats made partially tolerant to ovalbumin (OVA) by feeding an OVA-containing diet for 4 weeks from weaning. At 2 months of age, the animals were intracutaneously immunized with a mixture of OVA and HSA in Freund's complete adjuvant (FCA) at one site of the back, or separately at two different sites on the back. All rats made orally tolerant to OVA showed a significantly reduced IgE and IgG anti-OVA antibody production and DTH response to OVA, compared to the controls. OVA-fed rats subsequently immunized with a mixture of OVA + HSA had significantly lower IgE and DTH responses to HSA than the controls. When rats were immunized with OVA and HSA at two different sites, however, there was no difference in the response to HSA between the OVA-fed rats and the control rats, which rules out the possibility of shared epitopes between the antigens. Ear-challenge with the mixture of OVA + HSA gave a significantly lower DTH reaction in the tolerant rats immunized with a mixture of the antigens, compared to the control rats. However, suppression of the DTH reaction was not seen when tolerant and control rats were immunized with HSA alone and challenged with the mixture of OVA + HSA in one ear. These results present evidence that young rats orally tolerant to one antigen show a suppressed T-cell and antibody response to an unrelated antigen, provided that the two antigens are given in a mixture during the inductive phase. There was no evidence for bystander suppression of the T-cell response at the effector site.

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Selected References

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