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. 1995 Feb;84(2):310–316.

T-helper type-1-dominated lymph node responses induced in C57BL/6 mice by optimally irradiated cercariae of Schistosoma mansoni are down-regulated after challenge infection.

R M Pemberton 1, R A Wilson 1
PMCID: PMC1415091  PMID: 7751008

Abstract

Following a single percutaneous vaccination with optimally irradiated cercariae of Schistosoma mansoni, C57BL/6 mice mount a T-helper type-1 (Th1) lymphocyte-dominant immune response and are highly resistant to challenge infection. In this study, we show that, besides interferon-gamma (IFN-gamma), lymph node (LN) cells draining the site of vaccination produce significant amounts of interleukin (IL)-4 and IL-10 in culture with parasite antigen. After a challenge infection at the original site of vaccination, these LN cells did not generate an anamnestic Th1 response. Paradosically, IFN-gamma production and cell proliferation were profoundly down-regulated, whereas IL-4 production was enhanced and occurred earlier than in challenge control cultures. When challenge was applied to a site remote from vaccination, IFN-gamma down-regulation was less evident, but the IL-4 response was consistently enhanced. Neutralization of IL-10 in vitro restored IFN-gamma production by LN cells, whilst IL-4 levels were reduced. These data indicate that down-regulation of IFN-gamma is controlled by IL-10 and/or IL-4. Mice showing down-regulated Th1 responses in the LN after S. mansoni challenge infection did not have a reduced ability to eliminate challenge parasites, indicating that the post-vaccination Th1 response had already armed the lungs with effector T cells before administration of challenge parasites. The observed phenomena of down-regulated Th1 and enhanced Th2 responses may be of relevance to other systems involving multiple infections or vaccination/boosting. Repeated applications to percutaneous sites having common lymphatic drainage would be expected to favour Th2 responses. Alternatively, in order to induce Th1-dominant responses and avoid unwanted IL-4/IL-10 induction, the use of remote sites is indicated.

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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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