Abstract
Heme is an iron-containing complex involved in fundamental cellular functions including oxygen transport. Free heme accumulation in blood, during intravascular hemolysis and other pathological conditions, triggers vascular dysfunction, pro-inflammatory, and prothrombotic cascade. Studies by May et al present a novel finding that heme is a ligand for RAGE and that heme binds to the V domain of RAGE and induces RAGE oligomerization. Furthermore, they show that the in vivo consequences of heme-RAGE interaction lead to a pro-inflammatory and procoagulant phenotype in the lungs. This discovery of heme as a ligand for RAGE sets the stage for probing the role of RAGE in heme homeostasis and the pathogenic role of heme-RAGE interaction in hemolytic diseases.
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