Effect of Increased Tea Consumption on Oxidative DNA Damage among Smokers: A Randomized Controlled Study
| Autor: | Sanjiv Agarwal, Robin B. Harris, Sylvia Brown, Wendy Talbot, H-H. Sherry Chow, Iman A. Hakim, Sheila Wiseman |
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| Rok vydání: | 2003 |
| Předmět: |
Adult
Male medicine.medical_specialty Antioxidant Adolescent medicine.medical_treatment Urinary system Medicine (miscellaneous) Physiology medicine.disease_cause Catechin law.invention Oxidative dna damage chemistry.chemical_compound Randomized controlled trial law medicine Humans Aged Creatinine Nutrition and Dietetics Tea business.industry Smoking Confounding Deoxyguanosine food and beverages Middle Aged Green tea Surgery Oxidative Stress chemistry 8-Hydroxy-2'-Deoxyguanosine Linear Models Female business Oxidative stress DNA Damage |
| Zdroj: | The Journal of Nutrition. 133:3303S-3309S |
| ISSN: | 0022-3166 |
| Popis: | Tea drinking has been associated with decreased occurrence of cancer and heart disease. One potential mechanism for these findings is the strong antioxidant effect of tea polyphenols. A phase II randomized controlled tea intervention trial was designed to study the effect of high consumption (4 cups/d) of decaffeinated green or black tea on oxidative DNA damage as measured by urinary 8-hydroxydeoxyguanosine (8-OHdG) among smokers over a 4-mo period. A total of 143 heavy smokers, aged 18-79 y, were randomized to drink either green or black tea or water. Levels of plasma and urinary catechins and urinary 8-OHdG were measured monthly. A total of 133 of 143 smokers completed the 4-mo intervention. Multiple linear regression models were used to estimate the main effects and interaction effect of green and black tea consumption on creatinine-adjusted urinary 8-OHdG, with or without adjustment for potential confounders. Plasma and urinary levels of catechins rose significantly in the green tea group compared with the other two groups. Assessment of urinary 8-OHdG after adjustment for baseline measurements and other potential confounders revealed a highly significant decrease in urinary 8-OHdG (-31%) after 4 mo of drinking decaffeinated green tea (P = 0.002). No change in urinary 8-OHdG was seen among smokers assigned to the black tea group. These data suggest that regular green tea drinking might protect smokers from oxidative damages and could reduce cancer risk or other diseases caused by free radicals associated with smoking. |
| Databáze: | OpenAIRE |
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