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*
Department of Immunology, Imperial College School of Medicine, and
Medical Research Council Clinical Sciences Centre, Imperial College School of Medicine, Hammersmith Hospital, London, United Kingdom
The phenomena of infectious tolerance and linked-suppression are well established, but the mechanisms involved are incompletely defined. Anergic T cells can inhibit responsive T cells in vitro and prolong skin allograft survival in vivo. In this study the mechanisms underlying these events were explored. Allospecific mouse T cell clones rendered unresponsive in vitro inhibited proliferation by responsive T cells specific for the same alloantigens. The inhibition required the presence of APC, in that the response to coimmobilized anti-CD3 and anti-CD28 Abs was not inhibited. Coculture of anergic T cells with bone marrow-derived dendritic cells (DC) led to profound inhibition of the ability of the DC to stimulate T cells with the same or a different specificity. After coculture with anergic T cells expression of MHC class II, CD80 and CD86 by DC were down-regulated. These effects did not appear to be due to a soluble factor in that inhibition was not seen in Transwell experiments, and was not reversed by addition of neutralizing anti-IL-4, anti-IL-10, and anti-TGF-ß Abs. Taken together, these data suggest that anergic T cells function as suppressor cells by inhibiting Ag presentation by DC via a cell contact-dependent mechanism.
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