Alternative & Integrative Medicine

ISSN: 2327-5162

Alternative & Integrative Medicine
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ω-3-Polyunsaturated Fatty Acids and Colon Cancer

Dwivedi C*
Professor and Head, Department of Pharmaceutical Sciences, College of Pharmacy, South Dakota State University, USA
Corresponding Author : Chandradhar Dwivedi
Distinguished Professor and Head
Department of Pharmaceutical Sciences
College of Pharmacy, South Dakota State University
Brookings, SD 57007, USA
E-mail: Chandradhar.dwivedi@sdstate.edu
Received February 20, 2013; Accepted February 21, 2013; Published February 25, 2013
Citation: Dwivedi C (2013) ω-3-Polyunsaturated Fatty Acids and Colon Cancer. Altern Integr Med 2: 104. doi:10.4172/2327-5162.1000104
Copyright: © 2013 Dwivedi C. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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Colorectal cancer is the third most common cancer in USA. American Cancer Society has estimated about 103,170 cases of colon and 40,290 cases of rectal cancer in 2012. Colorectal cancer deaths account for 9% of all cancer deaths; 51,690 deaths from colorectal cancer are estimated in 2012 [1]. Fatty acid composition of dietary fat is one of detrimental factors in colon cancer development. Studies have indicated that diets containing high level of ω-6-polyunsaturated fatty acids such as linoleic acid enhance whereas diets containing ω-3- polyunsaturated fatty acids such as eicosapentaenoic acid reduce chemically-induced colon cancer development in rodents [2,3]. Diets containing fish oil (source of ω-3-polyunsaturated fatty acid) decrease colon carcinogenesis [4]. The effects of dietary fish oil on eicosanoid metabolism have been implicated as a potential mechanism of colon cancer prevention. ω-3-Fattyacids present in fish oil inhibit oxidative metabolism of arachidonic acid by the cyclooxygenase (COX) pathway responsible for prostaglandin synthesis which act as a tumor promoter [5].
Dietary mustard oil, a rich source of α-linolenic acid, an ω-3- fatty acid prevented colon cancer development in rats [6]. Dietary flaxseed oil, another very rich source of α-linolenic acid was effective in preventing colon cancer development in rats. Dietary flaxseed oil decreased the ratio of ω-6 to ω-3-fatty acids to optimal levels [7]. Dietary flaxseed meal, a rich source of α-linolenic acid, an ω-3-fatty acid and lignans also prevented colon cancer development in rats by increasing ω-3-fatty acids in serum and tissues, and decreasing expressions of COX-1 and COX-2 levels in tissues [8]. α-Linolenic acid and lignans (enterodiol and enterolactone derived from flaxseed) caused a decrease in cell proliferation and an increase in apoptosis in Caco-2, human colon cancer cells [9]. Dietary flaxseed also prevented intestinal tumor development in APCMin mice (a transgenic mice with mutation in APC gene causing development of spontaneous intestinal tumors) by increasing ω-3-fatty acids and lignans, and decreasing expressions of COX-1 and COX-2 levels [10]. Dietary canola oil, another source of α-linolenic acid was effective in preventing colon cancer development in rats by increasing ω-3-fatty acids in serum and tissues and decreasing the expression of COX-1 and COX-2 in tissues [11].
These studies have provided evidence indicating consumption of ω-3-fatty acids provides protection against colon cancer development in animal models and cell culture. Thus, dietary consumption of ω-3 fatty acid (fish, mustard, flax, canola) may provide protection in humans too. However, further studies in human volunteers are needed to establish the efficacy of ω-3-fatty acids for preventing colon cancer.
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