title: F2-Isoprostane level is associated with the angiotensin II type 1 receptor -153A/G gene polymorphism.
abstract: Recent studies have shown that F2-isoprostane levels-a marker for lipid peroxidation-are increased in human renovascular hypertension but not in essential hypertension. Angiotensin II specifically stimulates F2-isoprostane production through activation of the AT1 receptor. The objective was to determine whether there is a relationship between the level of oxidative stress evaluated by measuring urinary F2-isoprostanes levels and polymorphisms of genes involved in the renine angiotensin aldosterone system (RAAS) regulation. The population studied included 100 subjects, 65 of whom were healthy normotensives; the other 35 were suffering from untreated, essential hypertension. The polymorphisms studied concern the genes encoding angiotensin I-converting enzyme (ACE/in16del/ins), angiotensin II receptor type I (AGTR1/A+39C[A+1166C] and AGTR1/A-153G), angiotensinogen (AGT/M235T), and aldosterone synthase (CYP11B2/T344C). Oxidative stress was evaluated by measuring urinary F2-isoprostanes levels. The characteristics of the population were as follows: men/women = 46/56; age = 50 +/- 10 years; BMI = 24 +/- 3 kg/m2; SBP = 131.7 +/- 17.2 mm Hg; DBP = 84.6 +/- 10.4 mm Hg. In univariate analysis, urinary F2-isoprostane levels were significantly lower in the presence of the G allele of AGTR1/A-153G (56 +/- 17 vs 76 +/- 39 pmol/mmol creatinine; P < 0.001, and P < 0.01 after Bonferroni correction for 10 tests). In multivariate analysis, taking into account BP, age, gender, BMI, plasma glucose, and total cholesterol, the G allele of AGTR1/A-153G is linked independently to urinary F2-isoprostanes level (P < 0.01). Our data suggest that F2-isoprostane level depends at least in part on the A-153G polymorphism of the angiotensin II AT1 receptor gene. The clinical and prognostic relevance of this polymorphism requires further investigation.
authors.affiliation: Service de Cardiologie et Hypertension artérielle, CHU Michallon, BP 217, 38043 Grenoble Cedex 09, France. OOrmezzano@chu-grenoble.fr
authors.forename: Olivier
authors.initials: O
authors.lastname: Ormezzano
authors.forename: Jean-Luc
authors.initials: JL
authors.lastname: Cracowski
authors.forename: Jean-Michel
authors.initials: JM
authors.lastname: Mallion
authors.forename: Odette
authors.initials: O
authors.lastname: Poirier
authors.forename: Janine
authors.initials: J
authors.lastname: Bessard
authors.forename: Serge
authors.initials: S
authors.lastname: Briançon
authors.forename: Patrice
authors.initials: P
authors.lastname: François
authors.forename: Jean Philippe
authors.initials: JP
authors.lastname: Baguet
mesh_terms: D000328:Adult; D000804:Angiotensin II / Q000502:physiology; D028441:F2-Isoprostanes / Q000378:metabolism*; D005260:Female; D006801:Humans; D006973:Hypertension / Q000235:genetics; D008297:Male; D008875:Middle Aged; D018384:Oxidative Stress / Q000502:physiology; D011110:Polymorphism, Genetic; D044140:Receptor, Angiotensin, Type 1 / Q000235:genetics*; D012084:Renin-Angiotensin System / Q000235:genetics
chemical_list: D028441:F2-Isoprostanes; D044140:Receptor, Angiotensin, Type 1; D000804:Angiotensin II