title: Polyisoprenyl phosphates: natural antiinflammatory lipid signals.
abstract: Lipoxins (LX) and aspirin-triggered 15-epimer LX are leukocyte-derived eicosanoids generated during host defense that serve as down-regulatory signals. The specific intracellular events that govern cellular responses to inhibitory extracellular signals are of wide interest in order to understand pivotal intracellular events in diseases characterized by enhanced inflammatory responses, such as asthma, rheumatoid arthritis and atherosclerosis. We recently uncovered a novel role for polyisoprenyl phosphates, in particular presqualene diphosphate (PSDP), as natural down-regulatory signals in human neutrophils that directly inhibit phospholipase D and superoxide anion generation. Activation of LXA4 receptors (ALXR) reverses proinflammatory receptor-initiated decrements in PSDP and inhibits cellular responses. These findings represent evidence for a novel paradigm for lipid-protein interactions in the control of cellular responses, namely receptor-initiated degradation of repressor lipids that is subject to regulation by aspirin treatment via the actions of aspirin-triggered 15-epimer LX at the ALXR, and identify new templates for antiinflammatory drugs by design.
authors.affiliation: Center for Experimental Therapeutics and Reperfusion Injury, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts 02115, USA.
authors.forename: B D
authors.initials: BD
authors.lastname: Levy
authors.forename: C N
authors.initials: CN
authors.lastname: Serhan
mesh_terms: D000893:Anti-Inflammatory Agents / Q000737:chemistry / Q000378:metabolism*; D001241:Aspirin / Q000378:metabolism; D006801:Humans; D013058:Mass Spectrometry; D008954:Models, Biological; D015394:Molecular Structure; D009504:Neutrophils / Q000378:metabolism; D010739:Phospholipase D / Q000037:antagonists & inhibitors / Q000378:metabolism; D010944:Plants / Q000201:enzymology; D011106:Polyisoprenyl Phosphates / Q000737:chemistry / Q000378:metabolism*; D011956:Receptors, Cell Surface / Q000378:metabolism; D044042:Receptors, Formyl Peptide; D044067:Receptors, Lipoxin; D015398:Signal Transduction / Q000502:physiology*; D013481:Superoxides / Q000378:metabolism
chemical_list: D000893:Anti-Inflammatory Agents; C105101:FPR2 protein, human; D011106:Polyisoprenyl Phosphates; D011956:Receptors, Cell Surface; D044042:Receptors, Formyl Peptide; D044067:Receptors, Lipoxin; D013481:Superoxides; D010739:Phospholipase D; D001241:Aspirin