Resumen: Nitric oxide (NO) exerts both protective and proinflammatory actions in the gastrointestinal tract. Enhanced gastric NO synthase (NOS) activity has been shown in duodenal ulcer patients. Recently, intron-4 polymorphism of the endothelial constitutive (ec) NOS gene has been associated with some pathological conditions. Our aim was to determine the genotype and allele frequencies of the ecNOS4 polymorphism in peptic ulcer patients. The distribution of the polymorphism ecNOS4a/b was studied in 188 ulcer patients and 120 healthy controls, from genomic DNA. Genotypes ab, bb, and aa and allele frequency were similar in both peptic ulcer patients and controls, and no differences were found when patients and controls were analyzed according to the presence of several etiological factors. However, alelle “a” carrier status was associated with decreased risk of bleeding in duodenal ulcer patients (OR 0.49; 95% CI 0.25– 0.95; P 0.03). In conclusion, this ecNOS4 polymorphism gene
could be related to susceptibility of duodenal ulcer patients to bleeding. KEY WORDS: endothelial nitric oxide synthase; DNA polymorphism; peptic ulcer. Idioma: Inglés DOI: 10.1023/A:1015021603681 Año: 2002 Publicado en: Digestive Diseases and Sciences 47, 5 (2002), 996-1000 ISSN: 0163-2116 Factor impacto JCR: 1.438 (2002) Categ. JCR: GASTROENTEROLOGY & HEPATOLOGY rank: 27 / 45 = 0.6 (2002) - Q3 - T2 Tipo y forma: Artículo (Versión definitiva) Área (Departamento): Área Microbiología (Dpto. Microb.Med.Pr.,Sal.Públ.) Área (Departamento): Area Medicina (Dpto. Medicina, Psiqu. y Derm.)