Journal of Nutrition and Health

The Korean Nutrition Society (한국영양학회)
권호 표지

Effect of $\alpha$-Linolenic Acid Rich Perilla oil on Colonic Mucosal Levels of Biomarkers(Fatty Acid Profile, DAG, Eicosanoid) in Colon Carcinogenesis of DMH-Treated Rats

들기름이 Dimethylhydrazine으로 처리한 쥐에서 대장암의 Biomarker인 지방산조성과 1, 2-Diacylglycerol 및 Eicosanoid 함량에 미치는 영향

  • 김채종 (경희대학교 가정대학 식품영양학과)
  • Published : 1996.02.01
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Abstract

The study was designed to observe the effect of blend fat calculated from the foods consumed in Korean with those of perilla oil, beef tallow and corn oil on colonic mucosal phospholipid fatty acid composition and the levels of TXB2 and diacylglycerol (DAG) which were known as biomarkers for cancer. Male Sprague Dawley rats, at 7 weeks of age, were divided into control and 1, 2-dimethylhydrazine (DMH)-treated group, and each group was subdivided into four groups. The experimental diets contained one of four dietary fats, blend fat (BF), perilla oil(PO), beef tallow (BT) or corn oil (CO), at 15% (w/w) level. At the same time, each rat was injected with saline for control group or DMH twice a week for 6 weeks to give total dose of 180mg/kg body weight. DMH injection, regardless of the type of dietary fats, significantly increased the levels of PGE2 and TXB2 in colonic mucosal layer compared to control (p<0.01). However, the level of eicosanoids was influenced by the types of dietary fats in both control and DMH group. In control groups, colonic mucosal level of TXB2 was higher in beef tallow group, but lower in perilla oil group compared to that of blend fat (p<0.01). In DMH groups, the level of TXB2 was higher in beef tallow and corn oil groups(p<0.05). The level of PGE2 showed the same trends with TXB2 and beef tallow most significantly increased the level of PGE2. DMH treatment did not influence on tissue fatty acid profile, which was directly reflected by dietary fatty acid composition. Proportions of C18 : 2 in colonic mucosal phospholipid well reflected dietary level of C18 : 2 showing the order CO>BF>PO>BT. The precentage of arachidonic acid(AA) in mucosal phospholipid was the highest by CO adn BT groups and the lowest by PO group. The incorporation of $\alpha$-linolenic acid in colonic mucosal phospholipid in perilla oil group was negatively correlated to the content of AA. Dietary level of C18 : 2 might not be the only controlling factor for the production of eicosanoids in colonic mucosa layer and might function with $\omega$3 fatty acids. The level of DAG was significanlty lower in PO group than that of BT group. Therefore, $\omega$3 $\alpha$-linolenic acid rich perilla oil could be very important dietary sourec in controlling eicosanoid production DAG level in cloln and recommenced to use more often in meal preparation to reduce the risk factor against colon cancer.

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