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Oxidative stress markers in adults 2 years after Roux-en-Y gastric bypass.
MedLine Citation:
PMID:  23263721     Owner:  NLM     Status:  Publisher    
INTRODUCTION: Obesity is a chronic disease associated with oxidative stress. Bariatric surgery for the treatment of obesity may affect biomarkers of oxidative stress. OBJECTIVES: The aim of the present study was to evaluate the effect of Roux-en-Y gastric bypass (RYGB) on blood markers of oxidative stress, such as vitamins C and E, β-carotene, reduced glutathione (GSH), catalase (CAT), ferric reducing antioxidant potential (FRAP), and thiobarbituric acid-reactive substances (TBARS). METHODS: A prospective controlled clinical trial was carried out. The participants were distributed into two groups: a control group (n=35), which was evaluated once, and a bariatric group (n=35), which was evaluated at baseline as well as 6, 12, and 24 months after surgery. RESULTS: After surgery, the BMI decreased from 47.05±1.46 to 30.53±1.14 kg/m (P<0.001), but 25.7% of the participants regained weight after 24 months. In relation to the baseline, postsurgery reductions were found in vitamin C (31.9±4.6%, P<0.001), β-carotene (360.7±368.3%, P<0.001), vitamin E (22.8±4.1%, P<0.001), GSH (6.6±5.2%, P=0.090), CAT (12.7±5.6%, P=0.029), and FRAP (1.2±3.8%, P=0.085) 2 years after RYGB. TBARS levels decreased after 12 months (71.6±2.9%, P<0.001) in relation to the baseline but increased by 195.0±28.2% between the 12th and the 24th month (P<0.001). CONCLUSION: The present findings show that oxidative stress returned 2 years after RYGB. Concentrations of vitamin C, β-carotene, GSH, CAT, and FRAP were decreased, whereas the concentration of TBARS decreased in the first year but increased in the following year, which may be partly explained by the imbalance between antioxidants and pro-oxidants.
Carla Dadalt; Regina L M Fagundes; Emilia A M Moreira; Danilo Wilhelm-Filho; Maiara B de Freitas; Alceu A Jordão Júnior; Fernanda Biscaro; Rozangela C Pedrosa; Hélio Vannucchi
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-12-20
Journal Detail:
Title:  European journal of gastroenterology & hepatology     Volume:  -     ISSN:  1473-5687     ISO Abbreviation:  Eur J Gastroenterol Hepatol     Publication Date:  2012 Dec 
Date Detail:
Created Date:  2012-12-24     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9000874     Medline TA:  Eur J Gastroenterol Hepatol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
aPostgraduate Programme in Nutrition bDepartment of Nutrition, Postgraduate Programme in Nutrition cDepartment of Ecology and Zoology dPostgraduate Programme in Pharmaceutical Science eDepartment of Biochemistry, Federal University of Santa Catarina fDepartment of Clinical Medicine, Ribeirão Preto Medical College, University of São Paulo, Brazil.
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