title: Effect of human 15-lipoxygenase-1 metabolites on vascular function in mouse mesenteric arteries and hearts.
abstract: Lipoxygenases regulate vascular function by metabolizing arachidonic acid (AA) to dilator eicosanoids. Previously, we showed that endothelium-targeted adenoviral vector-mediated gene transfer of the human 15-lipoxygenase-1 (h15-LO-1) enhances arterial relaxation through the production of vasodilatory hydroxyepoxyeicosatrienoic acid (HEETA) and trihydroxyeicosatrienoic acid (THETA) metabolites. To further define this function, a transgenic (Tg) mouse line that overexpresses h15-LO-1 was studied. Western blot, immunohistochemistry and RT-PCR results confirmed expression of 15-LO-1 transgene in tissues, especially high quantity in coronary arterial wall, of Tg mice. Reverse-phase HPLC analysis of [(14)C]-AA metabolites in heart tissues revealed enhanced 15-HETE synthesis in Tg vs. WT mice. Among the 15-LO-1 metabolites, 15-HETE, erythro-13-H-14,15-EETA, and 11(R),12(S),15(S)-THETA relaxed the mouse mesenteric arteries to the greatest extent. The presence of h15-LO-1 increased acetylcholine- and AA-mediated relaxation in mesenteric arteries of Tg mice compared to WT mice. 15-LO-1 was most abundant in the heart; therefore, we used the Langendorff heart model to test the hypothesis that elevated 15-LO-1 levels would increase coronary flow following a short ischemia episode. Both peak flow and excess flow of reperfused hearts were significantly elevated in hearts from Tg compared to WT mice being 2.03 and 3.22 times greater, respectively. These results indicate that h15-LO-1-derived metabolites are highly vasoactive and may play a critical role in regulating coronary blood flow.
authors.affiliation: Department of Pharmacology and Toxicology, Medical College of Wisconsin, 8701 Watertown Plank Road, Milwaukee, WI 53226, United States. Electronic address: tkriska@mcw.edu.
authors.forename: Tamas
authors.initials: T
authors.lastname: Kriska
authors.forename: Cody
authors.initials: C
authors.lastname: Cepura
authors.forename: Lawan
authors.initials: L
authors.lastname: Siangjong
authors.forename: Tina C
authors.initials: TC
authors.lastname: Wan
authors.forename: John A
authors.initials: JA
authors.lastname: Auchampach
authors.forename: Aviv
authors.initials: A
authors.lastname: Shaish
authors.forename: Dror
authors.initials: D
authors.lastname: Haratz
authors.forename: Ganesh
authors.initials: G
authors.lastname: Kumar
authors.forename: John R
authors.initials: JR
authors.lastname: Falck
authors.forename: Kathryn M
authors.initials: KM
authors.lastname: Gauthier
authors.forename: William B
authors.initials: WB
authors.lastname: Campbell
mesh_terms: D000818:Animals; D001011:Aorta / Q000201:enzymology / Q000502:physiology; D001093:Arachidonate 15-Lipoxygenase / Q000235:genetics / Q000378:metabolism*; D016718:Arachidonic Acid / Q000378:metabolism; D001794:Blood Pressure; D003326:Coronary Circulation; D003331:Coronary Vessels / Q000201:enzymology / Q000502:physiology*; D015971:Gene Expression Regulation, Enzymologic; D006801:Humans; D006940:Hyperemia / Q000201:enzymology / Q000503:physiopathology; D008297:Male; D008638:Mesenteric Arteries / Q000201:enzymology / Q000502:physiology*; D051379:Mice; D008822:Mice, Transgenic; D009928:Organ Specificity; D021381:Protein Transport; D014664:Vasodilation
chemical_list: D016718:Arachidonic Acid; D001093:Arachidonate 15-Lipoxygenase
keywords: 15-Lipoxygenase; AA; ACh; Coronary flow; EDHFs; Eicosanoids; Endothelium-derived hyperpolarizing factor; HEETAs; HETEs; HPETEs; Indo; Ischemia/reperfusion; LOs; NDGA; Reactive hyperemia; THETAs; Vasodilation; acetylcholine; arachidonic acid; endothelium-derived hyperpolarizing factors; hydroperoxyeicosatetraenoic acids; hydroxy-epoxyeicosatrienoic acids; indomethacin; l-NA; lipoxygenases; monohydroperoxyeicosatetraenoic acids; nitro-l-arginine; nordihydroguaiaretic acid; sEH; soluble epoxide hydrolase; trihydroxyeicosatrienoic acids