Carbon monoxide inhibits TLR-induced dendritic cell immunogenicity.

Rémy S, Blancou P, Tesson L, Tardif V, Brion R, Royer PJ, Motterlini R, Foresti R, Painchaut M, Pogu S, Gregoire M, Bach JM, Anegon I, Chauveau C.
J Immunol. 2009 Feb 15;182(4):1877-84.

Heme oxygenase-1 (HO-1) exerts its functions via the catabolism of heme into carbon monoxide (CO), Fe(2+), and biliverdin, as well as by depletion of free heme. We have recently described that overexpression of HO-1 is associated with the tolerogenic capacity to dendritic cells (DCs) stimulated by LPS. In this study, we demonstrate that treatment of human monocyte-derived DCs with CO blocks TLR3 and 4-induced phenotypic maturation, secretion of proinflammatory cytokines, and alloreactive T cell proliferation, while preserving IL-10 production. Treatment of DCs with biliverdin, bilirubin, and deferoxamine or replenishing intracellular heme stores had no effect on DC maturation. HO-1 and CO inhibited LPS-induced activation of the IFN regulatory factor 3 pathway and their effects were independent of p38, ERK, and JNK MAPK. HO-1 and CO treatment also inhibited mouse DC maturation in vitro and mouse DC immunogenic properties in vivo, as shown by adoptive cell transfer in a transgenic model of induced diabetes. Thus, for the first time, our data show that CO treatment inhibits DC immunogenicity induced by TLR ligands and that blockade of IFN regulatory factor 3 is associated with this effect.

URL: http://www.jimmunol.org/cgi/content/full/182/4/1877

Pub Med: http://www.ncbi.nlm.nih.gov/pubmed/19201840

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