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Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 J+Immunol 2008 ; 180 (3): 1655-61 Nephropedia Template TP
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Suppression of Th2 cell development by Notch ligands Delta 1 and 41 #MMPMID18209061
Sun J; Krawczyk CJ; Pearce EJ
J Immunol 2008[Feb]; 180 (3): 1655-61 PMID18209061show ga
Notch signaling plays important roles in Th cell activation. Here, we show that in response to TLR ligation, dendritic cells upregulate expression of Notch ligands Delta1 and Delta4 via a MyD88-dependent pathway. Expression of Delta1 or Delta4 by dendritic cells enhanced their ability to activate naïve Th cells and promote Th1 cell development, and allowed them to strongly inhibit Th2 cell development. Promotion of Th1 cell development was dependent on IFN? and T -bet expression by responding Th cells. However, the inhibition of Th2 cell development occurred independently of IFN? or T-bet, and resulted from a block in IL-4 initiated commitment to the Th2 lineage. The promotion of Th1 cell development by Delta is not a reflection of the delivery of pro-Th1 instructional signal, but rather is the result of a block in the downstream effects initiated by IL-4 signaling.