Journal of Nutrition and Health

The Korean Nutrition Society (한국영양학회)
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Different Sources of $\omega3$ Fatty Acids at the Fixed Ratio of p/s Affect Glutathione Dependent Enzymes in Rat Hepatocarcinogenesis

간세포 암화과정에서 p/s 고정비율과 $\omega3$ 지방산 급원에 따른 전암성 병변과 Glutathione 의존 해독화 효소계에 미치는 영향

  • 이해정 (서울대학교 생활과학대학 식품영양학과) ;
  • 김혜경 (서울대학교 생활과학대학 식품영양학과) ;
  • 최혜미 (서울대학교 생활과학대학 식품영양학과)
  • Published : 2003.10.01
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Abstract

This study is conducted to determine the effects of dietary source of $\omega$3 fatty acids on preneoplastic foci and the glutathione dependent enzymes in rat hepatocarcinogenesis initiated by diethylnitrosamine (DEN). Male Sprague-Dawley rats were fed one of three diets containing 10% (w/w) fats fixed p/s = -1.0 and $\omega$6/$\omega$3 ratio = -0.4 or 4.0 ; fish oil-com oil blended (FC), com oil-beef tallow-fish oil blended (CF), com oil-beef tallow-perilla oil blended (CP), from gestation period. At 10 weeks, animals of experimental groups were injected intraperitoneally with DEN (200 mg/kg body weight) and two-thirds partial hepatectomy was carried out 3 weeks later and were sacrificed 8 weeks after DEN initiation. The area and number of glutathione S-transferase placenta (GST-P) positive foci were significantly decreased in rats fed diets containing fish oil (FC and CF) than those fed perilla oil diet (CP). Fish oil feeding significantly increased the activities of glutathione dependent enzymes. Rats fed diets containing fish oil (FC and CF) significantly increased the glutathione (GSH) content and the activities of glutathione peroxidase (GPx), glutathione reductase (GR), and glutathione S-transferase (GST). Glutathione dependent enzymes had significantly negative correlation with GST-P positive foci. Glucose 6-phosphatase (G6Pase) was increased in rats feeding fish oil. Thiobarbituric acid reactive substances were not different among groups. Therefore, the preventive effect against hepatocarcinogenesis might be explained by induction of the glutathione dependent enzymes and G6Pase. (Korean J Nutrition 36(8): 785∼792, 2003)

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