Proinflammatory and oxidative stress markers in patients submitted to Roux-en-Y gastric bypass after 1 year of follow-up

BACKGROUND/OBJECTIVES: This study examined the effect of weight loss after 3, 6 and 12 months of Roux-en-Y Gastric Bypass (RYGB) on energy intake and on several biomarkers of oxidative stress such as levels of vitamin C, beta-carotene, vitamin E (diet/blood), nitric oxide metabolites (NOx), myeloperoxidase (MPO), thiobarbituric acid reactive substances (TBARS), reduced glutathione (GSH) and activity of catalase (CAT). SUBJECTS/METHODS: Study with a control group (CG), assessed once, and a bariatric group (BG) assessed at the basal period as well as at 3, 6 and 12 months post-surgery; both groups were composed of 5 men and 31 women (n = 36). Age was 38.7 +/- 9.4 and 39.6 +/- 9.2 years old and body mass index (BMI) was 22.2 +/- 2.1 and 47.6 +/- 9.1 kg/m(2), respectively. The variance measure quoted was SEM. RESULTS: The body weight at 12 months was 35.8 +/- 1.0% (P<0.001) lower than that of the basal period. At the basal period BG showed higher levels of NOx (P=0.007) and TBARS (P<0.001) and lower levels of vitamins C and E (P<0.001) compared with CG. After 3 months the activity of MPO was decreased (P<0.001). Six months after surgery GSH levels were decreased (P=0.037), whereas CAT activity was increased (P=0.029). After 12 months levels of NOx (P=0.004), TBARS (P<0.001), beta-carotene (P<0.001) and vitamin E (P<0.001) were decreased, whereas those of vitamin C (P<0.001) were increased compared with controls. CONCLUSION: RYGB followed by a daily vitamin supplement apparently attenuated pro-inflammatory and oxidative stress markers 1 year after surgery, but additional antioxidant supplementation appears necessary.Fundacao de Apoio a Pesquisa Cientifica e Tecnologica do Estado de Santa Catarina (FAPESC) [14191/2007-7]Fundacao de Apoio a Pesquisa Cientifica e Tecnologica do Estado de Santa Catarina (FAPESC)Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)-Bolsa ProdutividadeConselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)Bolsa ProdutividadePrograma Institucional de Bolsa de Iniciacao Cientifica (PIBIC)Programa Institucional de Bolsa de Iniciacao Cientifica (PIBIC)Programa de Pos-Graduacao em Nutricao da Universidade Federal de Santa CatarinaPrograma de PosGraduacao em Nutricao da Universidade Federal de Santa CatarinaPrograma de Fomento a PosGraduacao (PROF)/Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)Programa de Fomento a Pos-Graduacao (PROF)/Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES