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Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 J+Immunol 2017 ; 199 (1): 278-91 Nephropedia Template TP
Sheen JH; Strainic M; Lui J; Zhang W; Yi Z; Medof ME; Heeger PS
J Immunol 2017[Jul]; 199 (1): 278-91 PMID28539427show ga
Induction of pro-inflammatory T cell immunity is augmented by innate dendritic cell (DC) maturation commonly initiated by Toll-like receptor (TLR) signaling. We demonstrate that ligation of TLR3, 4, and 9 induces murine DC production of complement components and local production of the anaphylatoxin C5a. In vitro, ex vivo, and in vivo analyses show that TLR-induced DC maturation as assessed by surface phenotype, expression profiling by gene array, and functional ability to stimulate T cell responses, requires autocrine C3a- and C5a-receptor (C3ar1/C5ar1) signaling. Studies employing bone marrow chimeric animals and Foxp3-GFP/ERT2-Cre/dTomato fate mapping mice show that TLR-initiated, DC autocrine C3ar1/C5ar1 signaling causes expansion of effector T cells and instability of regulatory T cells and contributes T cell-dependent transplant rejection. Together, our data position immune cell-derived complement production and autocrine/paracrine C3ar1/C5ar1 signaling as crucial intermediary processes that link TLR-stimulation to DC maturation and the subsequent development of effector T cell responses.