title: Influence of eNOS haplotypes on the plasma nitric oxide products concentrations in hypertensive and type 2 diabetes mellitus patients.
abstract: Endothelial nitric oxide synthase (eNOS) haplotypes are associated with hypertension (HT) in patients with or without type 2 diabetes mellitus (T2DM). We evaluated the association of eNOS genotypes/haplotypes with the plasma concentrations of nitrite/nitrate (NO(x)), which are products of nitric oxide in HT, T2DM, and T2DM+HT patients. We studied eNOS polymorphisms in the promoter region (T-786C), in exon 7 (Glu298Asp), and in intron 4 (b/a) in 98 controls, 68 patients with HT, 66 patients with T2DM, and 86 patients with T2DM+HT. NO(x) concentrations were assessed using a chemiluminescence assay. No differences were found in genotype/allele distribution among groups. Genotypes were not associated with NO(x) concentrations. The "C-Glu-b" haplotype was more common in controls than in HT/T2DM+HT groups (21% versus 9/5%, respectively, P<0.006). This haplotype was more common in HT and T2DM+HT groups among subjects with high (82+/-38 and 90+/-33 microM, respectively) than with low (35+/-7 and 34+/-7 microM, respectively) NO(x) concentrations. Conversely, the "C-Asp-b" haplotype was more common in HT/T2DM+HT groups than healthy (21/21% versus 10%, respectively, P<0.006). The haplotype associated with lower risk of developing hypertension is also associated with higher NO(x) levels among hypertensives. Conversely, the haplotype increasing the risk of developing hypertension is associated with lower NO(x) levels in hypertensives.
authors.affiliation: Department of Pharmacology, Faculty of Medicine of Ribeirao Preto, University of Sao Paulo, Av. Bandeirantes, 3900, 14049-900 Ribeirao Preto, SP, Brazil.
authors.forename: Valeria C
authors.initials: VC
authors.lastname: Sandrim
authors.forename: Roger W C
authors.initials: RW
authors.lastname: de Syllos
authors.forename: Hugo R K
authors.initials: HR
authors.lastname: Lisboa
authors.forename: Glaucia S
authors.initials: GS
authors.lastname: Tres
authors.forename: Jose E
authors.initials: JE
authors.lastname: Tanus-Santos
mesh_terms: D000328:Adult; D000368:Aged; D003924:Diabetes Mellitus, Type 2 / Q000097:blood* / Q000201:enzymology / Q000235:genetics; D005260:Female; D005787:Gene Frequency; D005838:Genotype; D006239:Haplotypes; D006801:Humans; D006973:Hypertension / Q000097:blood* / Q000201:enzymology / Q000235:genetics; D007527:Isoenzymes / Q000235:genetics / Q000378:metabolism; D008297:Male; D008875:Middle Aged; D009566:Nitrates / Q000097:blood; D009569:Nitric Oxide / Q000097:blood*; D052250:Nitric Oxide Synthase Type III / Q000235:genetics* / Q000378:metabolism; D009573:Nitrites / Q000097:blood; D011110:Polymorphism, Genetic; D012307:Risk Factors
chemical_list: D007527:Isoenzymes; D009566:Nitrates; D009573:Nitrites; D009569:Nitric Oxide; C496314:NOS3 protein, human; D052250:Nitric Oxide Synthase Type III