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. 1992 Oct 1;176(4):1063–1072. doi: 10.1084/jem.176.4.1063

Defective maintenance of T cell tolerance to a superantigen in MRL- lpr/lpr mice

PMCID: PMC2119382  PMID: 1402652

Abstract

In normal mice neonatal injection of staphylococcal enterotoxin B (SEB) induces tolerance in T cells that express reactive T cell receptor (TCR) V beta regions. To determine if a T cell neonatal defect was present in MRL-lpr/lpr mice, 20 micrograms of SEB was injected intraperitoneally every other day into V beta 8.2 TCR transgenic and nontransgenic MRL(-)+/+ and MRL-lpr/lpr mice from birth to 2 wk of age. At 2 wk of age, V beta 8+ T cells were depleted, and SEB reactivity was lost, in spleen, lymph node, and thymus. These effects were equivalent in +/+ and lpr/lpr SEB-tolerized mice. However, MRL-lpr/lpr mice failed to maintain neonatal tolerance. By 4 wk of age, there was a dramatic increase in T cells expressing V beta 8.2 in the peripheral lymph nodes of MRL-lpr/lpr mice but not MRL(-)+/+ mice. In vitro stimulation with SEB or TCR crosslinking revealed a total loss of neonatal tolerance 2 wk after cessation of SEB treatment in lpr/lpr mice, but not +/+ mice. The time-course of recovery of V beta 8+ T cells and reactivity to SEB and TCR crosslinking in the thymus of MRL-lpr/lpr mice was similar to that in the lymph node. Thymectomy at 2 wk of age eliminated tolerance loss in lymph nodes of MRL-lpr/lpr mice at 4 wk of age, indicating that loss of peripheral tolerance was due to the emigration of untolerized T cells from the thymus. Challenge of neonatally tolerized MRL-lpr/lpr mice with SEB (100 micrograms, i.p.) at 8 wk of age resulted in a dramatic onset of T cell-mediated autoimmune disease characterized by 30% weight loss and 60% morality. This indicated that loss of tolerance to SEB also occurred in vivo. In contrast, neonatally tolerized MRL(- )+/+ mice remained totally unresponsive to SEB challenge and did not undergo any detectable weight loss. These results suggest that there is normal induction of neonatal tolerance to SEB in lpr/lpr mice, but that tolerance is not maintained after the tolerizing antigen is removed. This loss of neonatal tolerance can lead to severe weight loss and death on exposure to the tolerizing antigen later in life.

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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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