title: The role of innate immunity in atherogenesis.
abstract: Lipid peroxidation is a common event in health and is greatly accelerated in pro-inflammatory settings such as hypercholesterolemia. Consequently, oxidation-specific epitopes are generated, which are pro-inflammatory and immunogenic, leading to both adaptive and innate responses. Because innate immune mechanisms use conserved germline pattern recognition receptors (PRRs) that are preformed and present at birth, it is not obvious why they should bind to such epitopes. In this review, we put forward the hypothesis that because oxidation-specific epitopes are ubiquitous in both health and disease, and because they in essence represent "danger signals," they constitute a class of pathogen-associated molecular patterns leading to the natural selection of multiple innate PRRs that target such epitopes. We suggest that apoptotic cells, and the blebs and microparticles released from such cells, which are rich in oxidation-specific epitopes and thus pro-inflammatory, constitute an endogenous set of selecting antigens. In turn, natural antibodies, scavenger receptors, and soluble innate proteins, such as pentraxins, all represent PRRs that target such epitopes. We discuss the evidence for this hypothesis and the consequences of such responses in health and disease, such as atherosclerosis.
authors.affiliation: Department of Medicine, University of California, San Diego, CA, USA.
authors.forename: Karsten
authors.initials: K
authors.lastname: Hartvigsen
authors.forename: Meng-Yun
authors.initials: MY
authors.lastname: Chou
authors.forename: Lotte F
authors.initials: LF
authors.lastname: Hansen
authors.forename: Peter X
authors.initials: PX
authors.lastname: Shaw
authors.forename: Sotirios
authors.initials: S
authors.lastname: Tsimikas
authors.forename: Christoph J
authors.initials: CJ
authors.lastname: Binder
authors.forename: Joseph L
authors.initials: JL
authors.lastname: Witztum
mesh_terms: D000220:Adaptation, Biological / Q000276:immunology; D000818:Animals; D050197:Atherosclerosis / Q000276:immunology*; D000939:Epitopes / Q000276:immunology; D006801:Humans; D007113:Immunity, Innate / Q000276:immunology*; D010084:Oxidation-Reduction; D051192:Receptors, Pattern Recognition / Q000276:immunology
chemical_list: D000939:Epitopes; D051192:Receptors, Pattern Recognition