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자료유형
학술저널
저자정보
Suwannakul, Nattawan (Department of Biochemistry, Faculty of Medicine, Chiang Mai University) Punvittayagul, Charatda (Department of Biochemistry, Faculty of Medicine, Chiang Mai University) Jarukamjorn, Kanokwan (Department of Pharmaceutical Chemistry, Faculty of Pharmceutical Sciences, Khon Kaen University) Wongpoomchai, Rawiwan (Department of Biochemistry, Faculty of Medicine, Chiang Mai University)
저널정보
아시아태평양암예방학회 Asian Pacific journal of cancer prevention : APJCP Asian Pacific journal of cancer prevention : APJCP 제16권 제8호
발행연도
2015.1
수록면
3,371 - 3,376 (6page)

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Pigmented rice bran has been suggested to be a valuable source of beneficial phytochemicals. We investigated genotoxic and anti-genotoxic effects of purple rice bran extract (PRBE) in rats using a liver micronucleus assay. Purple rice bran was extracted with methanol, obtaining large amounts of phenolic compounds, including anthocyanins and small amounts of gamma-oryzanol. The experimental protocols were divided into two sets. Male rats were divided into three groups. Group 1 was a negative control, while Groups 2 and 3 were fed with 100 and 500 mg/kg bw of PRBE, respectively, for 28 days. PRBE had no effect on micronucleus formation or xenobiotic metabolizing enzymes in rat liver. Experiments concerning the effect of PRBE on $AFB_1$ showed that PRBE significantly lessened the amount of micronucleated hepatocytes in $AFB_1$ treated rats. Furthermore, it modulated metabolic activation of $AFB_1$ metabolism in the liver by suppressing activity and protein expression of CYP1A2, CYP3A and CYP 450 reductase, and enhancing phase II enzymes including GST and UGT. Overall, purple rice bran extract was not genotoxic in rats. It exhibited anti-genotoxicity by modulation some xenobiotic enzymes active in $AFB_1$ metabolism.

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