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Concept
Specialized pro-resolving mediators
Summary
Specialized pro-resolving mediators (SPM, also termed specialized proresolving mediators) are a large and growing class of cell signaling molecules formed in cells by the metabolism of polyunsaturated fatty acids (PUFA) by one or a combination of lipoxygenase, cyclooxygenase, and cytochrome P450 monooxygenase enzymes. Pre-clinical studies, primarily in animal models and human tissues, implicate SPM in orchestrating the resolution of inflammation. Prominent members include the resolvins and protectins.
SPM join the long list of other physiological agents which tend to limit inflammation (see ) including glucocorticoids, interleukin 10 (an anti-inflammatory cytokine), interleukin 1 receptor antagonist (an inhibitor of the action of pro-inflammatory cytokine, interleukin 1), annexin A1 (an inhibitor of formation of pro-inflammatory metabolites of polyunsaturated fatty acids), and the gaseous resolvins, carbon monoxide (see ), nitric oxide (see ), and hydrogen sulfide (see and ).
The absolute as well as relative roles of the SPM along with other physiological anti-inflammatory agents in resolving human inflammatory responses remain to be defined precisely. However, studies suggest that synthetic SPM that are resistant to being metabolically inactivated hold promise of being clinically useful pharmacological tools for preventing and resolving a wide range of pathological inflammatory responses along with the tissue destruction and morbidity that these responses cause. Based on animal model studies, the inflammation-based diseases which may be treated by such metabolically resistant SPM analogs include not only pathological and tissue damaging responses to invading pathogens but also a wide array of pathological conditions in which inflammation is a contributing factor such as allergic inflammatory diseases (e.g. asthma, rhinitis), autoimmune diseases (e.g. rheumatoid arthritis, systemic lupus erythematosus), psoriasis, atherosclerosis disease leading to heart attacks and strokes, type 1 and type 2 diabetes, the metabolic syndrome, and certain dementia syndromes (e.
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