Oxidation-specific epitopes are danger-associated molecular patterns recognized by pattern recognition receptors of innate immunity.
Oxidation reactions are vital parts of metabolism and signal transduction. However, they also produce reactive oxygen species, which damage lipids, proteins and DNA, generating "oxidation-specific" epitopes. In this review, we discuss the hypothesis that such common oxidation-specific epitopes are a major target of innate immunity, recognized by a variety of "pattern recognition receptors" (PRRs). By analogy with microbial "pathogen-associated molecular patterns" (PAMPs), we postulate that host-derived, oxidation-specific epitopes can be considered to represent "danger (or damage)-associated molecular patterns" (DAMPs). We also argue that oxidation-specific epitopes present on apoptotic cells and their cellular debris provided the primary evolutionary pressure for the selection of such PRRs. Furthermore, because many PAMPs on microbes share molecular identity and/or mimicry with oxidation-specific epitopes, such PAMPs provide a strong secondary selecting pressure for the same set of oxidation-specific PRRs as well. Because lipid peroxidation is ubiquitous and a major component of the inflammatory state associated with atherosclerosis, the understanding that oxidation-specific epitopes are DAMPs, and thus the target of multiple arcs of innate immunity, provides novel insights into the pathogenesis of atherosclerosis. As examples, we show that both cellular and soluble PRRs, such as CD36, toll-like receptor-4, natural antibodies, and C-reactive protein recognize common oxidation-specific DAMPs, such as oxidized phospholipids and oxidized cholesteryl esters, and mediate a variety of immune responses, from expression of proinflammatory genes to excessive intracellular lipoprotein accumulation to atheroprotective humoral immunity. These insights may lead to improved understanding of inflammation and atherogenesis and suggest new approaches to diagnosis and therapy.
Department of Medicine-MC0682, University of California-San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA. yumiller@ucsd.edu
Yury I
YI
Miller
Soo-Ho
SH
Choi
Philipp
P
Wiesner
Longhou
L
Fang
Richard
R
Harkewicz
Karsten
K
Hartvigsen
Agnès
A
Boullier
Ayelet
A
Gonen
Cody J
CJ
Diehl
Xuchu
X
Que
Erica
E
Montano
Peter X
PX
Shaw
Sotirios
S
Tsimikas
Christoph J
CJ
Binder
Joseph L
JL
Witztum
D000818:Animals; D050197:Atherosclerosis / Q000503:physiopathology; D000939:Epitopes / Q000502:physiology*; D006801:Humans; D007113:Immunity, Innate / Q000502:physiology*; D010084:Oxidation-Reduction; D010085:Oxidative Phosphorylation; D051192:Receptors, Pattern Recognition / Q000502:physiology*
D000939:Epitopes; D051192:Receptors, Pattern Recognition
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