title: Inflammation resolved by retinoid X receptor-mediated inactivation of leukotriene signaling pathways.
abstract: Leukotrienes are implicated in the pathogenesis of diverse, inflammation-driven diseases. Metabolic inactivation of leukotriene signaling is an innate response to resolve inflammation, yet little is known of mechanisms regulating disposition of leukotrienes in peripheral tissues afflicted in common inflammatory diseases. We studied leukotriene hydroxylases (CYP4F gene products) in human skin, a common target of inflammation and adverse drug reactions. Epidermal keratinocytes express at least six CYP4F enzymes; the most highly expressed and highly regulated is CYP4F3A-the main neutrophil leukotriene hydroxylase. Differentiation-specific factors and retinoids are positive CYP4F regulators in vitro, effecting increased leukotriene B4 hydroxylation (inactivation). CYP4F expression is up-regulated in situ in hyperproliferative dermatoses-an innate mechanism to repair and restore epidermal barrier competency-and after retinoid therapy. Enhanced CYP4F-mediated inactivation of leukotriene signaling is a previously unrecognized antiinflammatory property of therapeutic retinoids mediated by preferential interactions between retinoid X receptors and CYP4F promoter elements in epidermal cells.
authors: University of Texas Health Science Center at Houston, 6431 Fannin St., Medical School Bldg. 6, Room 200, Houston, TX 77030, USA.
authors: Auinash
authors: A
authors: Kalsotra
authors: Liping
authors: L
authors: Du
authors: Ying
authors: Y
authors: Wang
authors: Patricia A
authors: PA
authors: Ladd
authors: Yasushi
authors: Y
authors: Kikuta
authors: Madeleine
authors: M
authors: Duvic
authors: Alan S
authors: AS
authors: Boyd
authors: Diane S
authors: DS
authors: Keeney
authors: Henry W
authors: HW
authors: Strobel
mesh_terms: D002454:Cell Differentiation / Q000187:drug effects; D002478:Cells, Cultured; D003577:Cytochrome P-450 Enzyme System / Q000235:genetics / Q000378:metabolism; D000078404:Epidermal Cells; D004817:Epidermis / Q000378:metabolism; D015971:Gene Expression Regulation, Enzymologic / Q000187:drug effects; D006801:Humans; D007249:Inflammation / Q000235:genetics / Q000378:metabolism / Q000473:pathology; D015289:Leukotrienes / Q000378:metabolism*; D047488:Retinoid X Receptors / Q000378:metabolism*; D015398:Signal Transduction; D014212:Tretinoin / Q000494:pharmacology; D015854:Up-Regulation / Q000187:drug effects
chemical_list: D015289:Leukotrienes; D047488:Retinoid X Receptors; D014212:Tretinoin; D003577:Cytochrome P-450 Enzyme System