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Deprecated: Implicit conversion from float 217.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Nat+Commun 2018 ; 9 (ä): ä Nephropedia Template TP
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Lymphotoxin ? fine-tunes T cell clonal deletion by regulating thymic entry of antigen-presenting cells #MMPMID29593265
Lopes N; Charaix J; Cédile O; Sergé A; Irla M
Nat Commun 2018[]; 9 (ä): ä PMID29593265show ga
Medullary thymic epithelial cells (mTEC) purge the T cell repertoire of autoreactive thymocytes. Although dendritic cells (DC) reinforce this process by transporting innocuous peripheral self-antigens, the mechanisms that control their thymic entry remain unclear. Here we show that mTEC-CD4+ thymocyte crosstalk regulates the thymus homing of SHPS-1+ conventional DCs (cDC), plasmacytoid DCs (pDC) and macrophages. This homing process is controlled by lymphotoxin ? (LT?), which negatively regulates CCL2, CCL8 and CCL12 chemokines in mTECs. Consequently, Lt?-deficient mice have increased expression of these chemokines that correlates with augmented classical NF-?B subunits and increased thymic recruitment of cDCs, pDCs and macrophages. This enhanced migration depends mainly on the chemokine receptor CCR2, and increases thymic clonal deletion. Altogether, this study identifies a fine-tuning mechanism of T cell repertoire selection and paves the way for therapeutic interventions to treat autoimmune disorders.