Lymph node fibroblastic reticular cells directly present peripheral tissue antigen under steady-state and inflammatory conditions

AL Fletcher, V Lukacs-Kornek, ED Reynoso… - Journal of Experimental …, 2010 - rupress.org
AL Fletcher, V Lukacs-Kornek, ED Reynoso, SE Pinner, A Bellemare-Pelletier, MS Curry…
Journal of Experimental Medicine, 2010rupress.org
Lymph node stromal cells (LNSCs) can induce potent, antigen-specific T cell tolerance
under steady-state conditions. Although expression of various peripheral tissue–restricted
antigens (PTAs) and presentation to naive CD8+ T cells has been demonstrated, the stromal
subsets responsible have not been identified. We report that fibroblastic reticular cells
(FRCs), which reside in the T cell zone of the LN, ectopically express and directly present a
model PTA to naive T cells, inducing their proliferation. However, we found that no single …
Lymph node stromal cells (LNSCs) can induce potent, antigen-specific T cell tolerance under steady-state conditions. Although expression of various peripheral tissue–restricted antigens (PTAs) and presentation to naive CD8+ T cells has been demonstrated, the stromal subsets responsible have not been identified. We report that fibroblastic reticular cells (FRCs), which reside in the T cell zone of the LN, ectopically express and directly present a model PTA to naive T cells, inducing their proliferation. However, we found that no single LNSC subset was responsible for PTA expression; rather, each subset had its own characteristic antigen display. Studies to date have concentrated on PTA presentation under steady-state conditions; however, because LNs are frequently inflammatory sites, we assessed whether inflammation altered stromal cell–T cell interactions. Strikingly, FRCs showed reduced stimulation of T cells after Toll-like receptor 3 ligation. We also characterize an LNSC subset expressing the highest levels of autoimmune regulator, which responds potently to bystander inflammation by up-regulating PTA expression. Collectively, these data show that diverse stromal cell types have evolved to constitutively express PTAs, and that exposure to viral products alters the interaction between T cells and LNSCs.
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