Positive and negative selection of T cells in T-cell receptor transgenic mice expressing a bcl-2 transgene (original) (raw)

Abstract

To explore the role of bcl-2 in T-cell development, a bcl-2 transgene was introduced into mice expressing a T-cell receptor (TCR) transgene encoding reactivity for the mouse male antigen HY presented by the H-2Db class I antigen of the major histocompatibility complex (MHC). Normal thymic development is contingent on the ability of immature thymocytes to interact with self-MHC molecules presented by thymic stroma (positive selection). Thus, thymocyte numbers are low in female anti-HY TCR transgenic mice with a nonselecting (H-2Dd) background. Expression of bcl-2 inhibited the death of nonselectable thymocytes since, strikingly, female H-2Dd bcl-2/TCR transgenic mice developed normal numbers of CD4+CD8+ thymocytes, although these did not mature further into functional T cells. Hence, TCR-MHC interaction may induce positive selection through two signals, one which saves cells from death by increasing Bcl-2 synthesis and another which promotes maturation. Male H-2Db anti-HY TCR transgenic mice normally have a very small thymus, due to deletion of the self-reactive T cells. Expression of bcl-2 reduced the efficiency of deletion, since bcl-2/TCR transgenic male mice accumulated 4- to 6-fold more thymocytes than did TCR transgenic male littermates. Anti-HY TCR-expressing cells were also more numerous in the peripheral lymphoid tissues, but these cells expressed abnormally low levels of CD8 co-receptor and were not responsive to the HY antigen. Thus, although bcl-2 expression hampers the deletion of immature self-reactive cells in the thymus, self-tolerance is maintained.

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Selected References

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