Abstract
Autoimmune MRL-lpr/lpr (lpr) mice were previously demonstrated to have an abnormal proliferation of intermediate T-cell receptor (TCR) cells of extrathymic origin in the liver. Despite this situation, thymectomy in lpr mice resulted in amelioration of autoimmune disease. To understand the underlying mechanism, we investigated associated T-cell differentiation in the thymus and other organs of these mice. When the disease was evoked, T cells with extrathymic properties, i.e. intermediate TCR-alpha beta cells expressing double-negative (DN) CD4-8- phenotype and interleukin-2 (IL-2) receptor beta-chain, became prominent not only in the liver, but also in the thymus. Such thymic T cells mainly resided in the medulla. A small-scale localization of such T cells was seen in the thymic medulla even in normal control mice. There was a heterogeneity among intermediate TCR cells in terms of the composition of DN cells and the expression of CD2 and B220 antigens, depending on the organs and the sites in the same organ. Intermediate TCR cells in the liver, thymus and autoimmune target organs (e.g. kidney) contained a high proportion of the active form (CD2+B220-), while intermediate TCR cells accumulating in peripheral organs, the spleen and lymph nodes, were mainly of the inactive form (CD2-B220+). The active form had an ability to proliferate in response to IL-2 and SEB, whereas the inactive form did not. The present results suggest that the proliferation of intermediate TCR cells occur at multiple sites; this may explain the effect of thymectomy, namely, the retarded onset of disease, in lpr mice.
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