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-Tocopherol Dietary Supplement Decreases Titers of Antibody against 5-Hydroxymethyl-2'-Deoxyuridine (HMdU)1
Lombardi Cancer Center, Georgetown University Medical Center, Washington, DC 20007 [J. J. H., B. N. S., J. J. H.]; Department of Epidemiology and Biostatistics, Memorial Sloan-Kettering Cancer Center, New York, New York 10021 [M. B., S. M.]; Department of Environmental Medicine, New York University School of Medicine, New York, New York 10016 [C. X. C., K. F.]; and Department of Public Health Sciences, Wake Forest University School of Medicine, Winston-Salem, North Carolina 27157 [R. B. D.]
This study evaluated the effects of vitamin E (
-tocopherol) on oxidative DNA damage in a randomized double-blind Phase II chemoprevention trial. Oxidative DNA damage was measured by the level of auto-antibody (Ab) against 5-hydroxymethyl-2'-deoxyuridine (HMdU) in plasma. After the baseline screening, eligible subjects (n = 31; plasma samples from 28 subjects were available for this study) were randomized to receive 15, 60, or 200 mg of
-tocopherol per day for 28 days. Biomarkers were measured twice at baselineon day 1 (visit 1) and day 3 (visit 2)and twice after interventionon day 17 (visit 3) and day 31 (visit 4). At baseline, there was a highly significant inverse correlation between anti-HMdU Ab titer and plasma vitamin E level (r = -0.53; P = 0.004; n = 28). Smoking did not affect baseline anti-HMdU Ab titer; however, anti-HMdU Ab titer levels at baseline were significantly lower in subjects with above-median (0.75 ounce/day) alcohol consumption (P = 0.008). No significant change in anti-HMdU Ab level occurred at either visit 3 or visit 4 for subjects on the lowest dose, 15 mg
-tocopherol per day. Subjects receiving 60 mg of
-tocopherol per day had a significant decrease in anti-HMdU Ab level at visits 3 and 4 compared with baseline (P = 0.049 and P = 0.02, respectively). However, subjects receiving the highest dose, 200 mg/day, had less consistent results: a significant decrease in anti-HMdU Ab level was seen at visit 4 (P = 0.04) but not at visit 3. Our results demonstrate an inverse relationship between
-tocopherol and anti-HMdU Abs in plasma; oxidative DNA damage can be modulated by short-term dietary supplementation of
-tocopherol in some subjects.
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