title: Altered release of cytochrome p450 metabolites of arachidonic acid in renovascular disease.
abstract: The aim of the present cross-sectional study was to investigate whether activation of the renin-angiotensin system in renovascular disease affects the cytochrome P450 omega/omega-1 hydroxylase (20-hydroxyeicosatetraenoic acid [20-HETE]) and epoxygenase (epoxyeicosatrienoic acids [EETs]) pathways of arachidonic acid metabolism in vivo, each of which interacts with angiotensin II. Plasma concentration and urinary excretion of 20-HETE and EETs and their metabolites, dihydroxyeicosatrienoic acids, were measured in urine and plasma by mass spectrometry in 10 subjects with renovascular disease, 10 with essential hypertension, and 10 healthy normotensive subjects (control subjects), pair-matched for gender and age. Vascular and renal function were evaluated in all of the subjects. Plasma 20-HETE was highest in subjects with renovascular disease (median: 1.20 ng/mL; range: 0.42 to 1.92 ng/mL) compared with subjects with essential hypertension (median: 0.90 ng/mL; range: 0.40 to 2.17 ng/mL) and control subjects (median: 0.45 ng/mL; range: 0.14 to 1.70 ng/mL; P<0.05). Plasma 20-HETE significantly correlated with plasma renin activity in renovascular disease (r(s)=0.67; n=10; P<0.05). The urinary excretion of 20-HETE was significantly lower in subjects with renovascular disease (median: 12.9 microg/g of creatinine; range: 4.4 to 24.9 microg/g of creatinine) than in control subjects (median: 31.0 microg/g of creatinine; range: 11.9 to 102.8 microg/g of creatinine; P<0.01) and essential hypertensive subjects (median: 35.9 microg/g of creatinine; range: 14.0 to 72.5 microg/g of creatinine; P<0.05). Total plasma EETs were lowest, as was the ratio of plasma EETs to plasma dihydroxyeicosatrienoic acids, an index of epoxide hydrolase activity, in renovascular disease (ratio: 2.4; range: 1.2 to 6.1) compared with essential hypertension (ratio: 3.4; range: 1.5 to 5.6) and control subjects (ratio: 6.8; range: 1.4 to 18.8; P<0.01). In conclusion, circulating levels of 20-HETE are increased and those of EETs are decreased in renovascular disease, whereas the urinary excretion of 20-HETE is reduced. Altered cytochrome P450 arachidonic acid metabolism may contribute to the vascular and tubular abnormalities of renovascular disease.
authors: Department of Biomedical and Surgical Sciences, Medicina Interna C, Policlinico GB Rossi, University of Verona, 37134 Verona, Italy. pietro.minuz@univr.it
authors: Pietro
authors: P
authors: Minuz
authors: Houli
authors: H
authors: Jiang
authors: Cristiano
authors: C
authors: Fava
authors: Lucia
authors: L
authors: Turolo
authors: Stefania
authors: S
authors: Tacconelli
authors: Marco
authors: M
authors: Ricci
authors: Paola
authors: P
authors: Patrignani
authors: Alberto
authors: A
authors: Morganti
authors: Alessandro
authors: A
authors: Lechi
authors: John C
authors: JC
authors: McGiff
mesh_terms: D015126:8,11,14-Eicosatrienoic Acid / Q000031:analogs & derivatives / Q000378:metabolism; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D016718:Arachidonic Acid / Q000378:metabolism*; D001095:Arachidonic Acids / Q000378:metabolism; D016022:Case-Control Studies; D003404:Creatinine / Q000378:metabolism; D003430:Cross-Sectional Studies; D003577:Cytochrome P-450 Enzyme System / Q000378:metabolism*; D006801:Humans; D006893:Hydroxyeicosatetraenoic Acids / Q000378:metabolism; D006973:Hypertension / Q000378:metabolism*; D006978:Hypertension, Renovascular / Q000378:metabolism*; D008297:Male; D008875:Middle Aged; D012078:Renal Artery Obstruction / Q000378:metabolism*
chemical_list: D001095:Arachidonic Acids; D006893:Hydroxyeicosatetraenoic Acids; D016718:Arachidonic Acid; C046783:11,12-epoxy-5,8,14-eicosatrienoic acid; C055987:20-hydroxy-5,8,11,14-eicosatetraenoic acid; D003577:Cytochrome P-450 Enzyme System; D003404:Creatinine; D015126:8,11,14-Eicosatrienoic Acid