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http://dx.doi.org/10.3746/jkfn.2003.32.3.418

Anticarcinogenic Responses of MCF-7 Breast Cancer Cells to Conjugated Linoleic Acid (CLA)  

문희정 (성신여자대학교 식품영양학과)
이순재 (대구가톨릭대학교 식품영양학과)
박수정 (성신여자대학교 식품영양학과)
장유진 (성신여자대학교 식품영양학과)
이명숙 (대구가톨릭대학교 식품영양학과)
Publication Information
Journal of the Korean Society of Food Science and Nutrition / v.32, no.3, 2003 , pp. 418-427 More about this Journal
Abstract
Conjugated linoleic acid (CLA) is the mixture of positional and geometric isomers of linoleic acid (LA, C18:2 $\omega$6), which is found abundantly in dairy products and meats. This study was peformed to investigate the anticarcinogenic effect of CLA in MCF-7 breast cancer cells. MCF-7 cell were treated with LA and CLA at the various concentrations of 15, 30, 60, 120 UM each. After incubation for 48 and 72 hours, cell proliferation, fatty acids incorporation into cell, peroxidation and activities of antioxidant enzymes were measured. Postaglandin E$_2$ (PGE$_2$) and thromboxane $A_2$ (TXA$_2$) were measured for the eicosanoids metabolism. There was no cell growth differences in both of LA and CLA treated MCF-7 cells at 48 hr incubation. Compared to LA, cell growth was decreased by CLA treatment according to increasing concentration at longer incubation times, respectively (p<0.05). Both of LA and CLA was incorporated into the cellular lipids 22~54% higher than in control but LA incorporation was not so linear as CLA according to concentration. Arachidonic acid (C20:4, $\omega$6) was synthesized after treatment of LA but did not in CLA, respectively. The lipid peroxide concentration in LA 120 $\mu$M group increased as 1.7 times as that in CLA 120 $\mu$M treated. The activities of antioxidant enzymes such as glutathione peroxidase and glutathione reductase were increased by the supplementation with CLA 120 $\mu$M at 72 hr incubation (p<0.001) compared to LA, otherwise activity of superoxide dismutase was not different in both. PGE$_2$ and TXA$_2$ levels were lower in condition of CLA treatments according to lower levels of arachidonic acids than those in LA treated group, respectively. Overall, the dietary CLA might change the MCF-7 cell growth by the changes of cell composition, production of lipid peroxide, activities of antioxidant enzymes and eicosanoid synthesis compared to dietary LA.
Keywords
conjugated linoleic acid (CLA); MCF-7 breast cancer cell; lipid peroxidation; antioxidant enzyme; prostagladin E$_2$(PGE$_2$); thromboxane $A_2$(TXA$_2$);
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