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Dietary conjugated linoleic acid (CLA) induces apoptosis of colonic mucosa in 1,2-dimethylhydrazine-treated rats: a possible mechanism of the anticarcinogenic effect by CLA

Published online by Cambridge University Press:  09 March 2007

Hyun S. Park ,
Ji H. Ryu ,
Yeong L. Ha  and
Jung H. Y. Park
Hyun S. Park
Affiliation:
Department of Food and Nutrition, Kyung Hee University, Seoul, Korea
Ji H. Ryu
Affiliation:
Department of Food and Nutrition, Kyung Hee University, Seoul, Korea
Yeong L. Ha
Affiliation:
Department of Agricultural Chemistry, Gyeongsang National University, Chinju, Korea
Jung H. Y. Park*
Affiliation:
Department of Life and Institute of Environment & Life Science, Hallym University, Chunchon, Korea
*
*Corresponding author: Professor Jung H. Y. Park, fax +82 33 256 0199, email [email protected]
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Abstract

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One of the objectives of the present study was to investigate whether 1 % conjugated linoleic acid (CLA) in the diet reduced tumour incidence in the colon of 1,2-dimethylhydrazine (DMH)-treated rats. Colon cancer was induced by injecting 6-week-old, male, Sprague–Dawley rats with 15 mg/kg DMH twice per week for 6 weeks. They were fed either 1 % CLA or a control diet ad libitum for 30 weeks. Dietary CLA significantly decreased colon tumour incidence (P<0·05). Our second objective was to investigate whether apoptosis in the colon mucosa of DMH-treated rats was affected by the amount of dietary CLA and whether the changes in apoptosis were related to those in fatty acid-responsive biomarkers. For this purpose, rats were killed after being fed a diet containing 0 %, 0·5 %, 1 % or 1·5 % CLA for 14 weeks. CLA was undetected in the mucosa of rats fed the 0 % CLA diet and increased to 5·9 mg/g phospholipid in rats fed the 0·5 % diet. The apoptotic index estimated by the terminal deoxynucleotidyl transferase-mediated dUTP nick and labelling technique was increased by 251 % and the 1,2-diacylglycerol content was decreased by 57 % in rats fed 0·5 % CLA. No further changes in these variables were observed when CLA in the diet was raised to 1·0 % or 1·5 %. However, dietary CLA decreased mucosal levels of prostaglandin E2, thromboxane B2 and arachidonic acid in a dose-dependent manner. The present data indicate that dietary CLA can inhibit DMH-induced colon carcinogenesis by mechanisms probably involving increased apoptosis.

Keywords

Conjugated linoleic acidColon cancerProstaglandin E2Thromboxane B21,2-diacylglycerolApoptosis
Type
Research Article
Information
British Journal of Nutrition , Volume 86 , Issue 5 , November 2001 , pp. 549 - 555
Copyright
Copyright © The Nutrition Society 2001

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