title: Eosinophil-derived neurotoxin / RNase 2: connecting the past, the present and the future.
abstract: The eosinophil-derived neurotoxin (EDN, also known as eosinophil protein-X) is best-known as one of the four major proteins found in the large specific granules of human eosinophilic leukocytes. Although it was named for its discovery and initial characterization as a neurotoxin, it is also expressed constitutively in human liver tissue and its expression can be induced in macrophages by proinflammatory stimuli. EDN and its divergent orthologs in rodents have ribonuclease activity, and are members of the extensive RNase A superfamily, although the relationship between the characterized physiologic functions and enzymatic activity remains poorly understood. Recent explorations into potential physiologic functions for EDN have provided us with some insights into its role in antiviral host defense, as a chemoattractant for human dendritic cells, and most recently, as an endogenous ligand for toll-like receptor (TLR)2.
authors.affiliation: Laboratory of Allergic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland 20892, USA. hrosenberg@niaid.nih.gov
authors.forename: H F
authors.initials: HF
authors.lastname: Rosenberg
mesh_terms: D000818:Animals; D003713:Dendritic Cells / Q000187:drug effects; D047208:Eosinophil-Derived Neurotoxin / Q000737:chemistry / Q000235:genetics / Q000502:physiology / Q000633:toxicity; D004804:Eosinophils / Q000201:enzymology*; D006801:Humans; D008024:Ligands; D008958:Models, Molecular; D020258:Neurotoxicity Syndromes / Q000201:enzymology / Q000209:etiology / Q000378:metabolism; D010802:Phylogeny; D051195:Toll-Like Receptor 2 / Q000378:metabolism
chemical_list: D008024:Ligands; D051195:Toll-Like Receptor 2; D047208:Eosinophil-Derived Neurotoxin