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-3 and -6 Fatty Acids on Initiation and Postinitiation Stages of Colon Carcinogenesis1
Division of Nutrition and Endocrinology, American Health Foundation, Valhalla, New York 10595
The effect of dietary menhaden oil containing 
-3 fatty acids and corn oil rich in -6 fatty acids fed during the initiation and/or postinitiation stages of colon carcinogenesis was investigated in male F344 rats. At 5 weeks of age, all animals were divided into seven groups (39 rats/group) and fed the semipurified diets containing 5% corn oil (LCO), 23.5% corn oil (HCO), or 18.5% menhaden oil plus 5% corn oil (HFO). At 7 weeks of age, all animals except the vehicle (normal saline)-treated groups were given two weekly s.c. injections of azoxymethane (AOM) at a dose rate of 15 mg/kg body weight, once weekly. Three days after the second injection of AOM, groups of animals fed LCO, LCO, HCO, HCO, HCO, HFO, or HFO diets were transferred, respectively, to LCO, HCO, LCO, HCO, HFO, HCO, or HFO and continued on these diets until termination of the experiment. All animals were necropsied 42 weeks after carcinogen treatment. Body weights of animals fed various experimental diets during the initiation and postinitiation periods were comparable. As expected, the HCO diet fed during the postinitiation period significantly increased the AOM-induced incidence and multiplicity of colon adenocarcinomas, whereas the HCO diet fed during the initiation phase of carcinogenesis had no effect. Colon tumor incidence and multiplicity were significantly reduced in groups fed the HFO diet at either initiation and/or postinitiation phases of carcinogenesis as compared with those fed the HCO diet. Whereas the precise mechanism producing the difference between the high menhaden oil (HFO) diet as compared with high corn oil (HCO) diet remain to be elucidated, it is likely that the effect during the initiation and postinitiation phases may be due to alteration in carcinogen metabolism and to modulation of prostaglandin synthesis, respectively.
1 This investigation was supported by USPHS Grants CA-17613 and CA-37663 from the National Cancer Institute. Animals were maintained under the guidelines set forth in the "Guide for the Care and Use of Laboratory Animal Resources" by the National Research Council.
2 To whom requests for reprints should be addressed.
Received 5/21/90. Accepted 10/23/90.
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