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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 Immunity 2015 ; 42 (3): 552-65 Nephropedia Template TP
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Local triggering of the ICOS coreceptor by CD11c+ myeloid cells drives organ inflammation in lupus #MMPMID25786178
Immunity 2015[Mar]; 42 (3): 552-65 PMID25786178show ga
The inducible T cell costimulator (ICOS) is a potent promoter of organ inflammation in murine lupus. ICOS stimulates T follicular helper cell differentiation in lymphoid tissue, suggesting that it might drive autoimmunity by enhancing autoantibody production. Yet, the pathogenic relevance of this mechanism remains unclear. It is also unknown whether other ICOS-induced processes might contribute to lupus pathology. Here we show that selective ablation of ICOS ligand (ICOSL) in CD11c+ cells but not in B cells dramatically ameliorates kidney and lung inflammation in lupus-prone MRL. Faslpr mice. Autoantibody formation was largely unaffected by ICOSL deficiency in CD11c+ cells. However, ICOSL display by CD11c+ cells in inflamed organs had a nonredundant role in protecting invading T cells from apoptosis by elevating activity of the PI3K-Akt signaling pathway, thereby facilitating T cell accrual. These findings reveal a mechanism that locally sustains organ inflammation in lupus.