Influence of dietary cis- and trans-fat on 1,2-dimethylhydrazine-induced colon tumors and fecal steroid excretion in Fischer 344 rats.

Influence of dietary cis- and trans-fat on 1,2-dimethylhydrazine-induced colon tumors and fecal steroid excretion in Fischer 344 rats.
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膳食顺式和反式脂肪对 Fischer 344 大鼠 1,2-二甲基肼诱导的结肠肿瘤和粪便类固醇排泄的影响。

DOI:
10.1093/ajcn/42.3.475
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发表时间:
1985
期刊:
The American journal of clinical nutrition
影响因子:
--
通讯作者:
Michihiro Sugano
Michihiro Sugano
中科院分区:
--
文献类型:
--
作者:
Midori Watanabe;T. Koga;Michihiro Sugano

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为了研究膳食脂肪酸几何结构差异对结肠肿瘤发生的影响,给雄性大鼠喂食含有 10% 水平的部分氢化玉米油(反式单烯脂肪)或橄榄油(顺式单烯脂肪)的半纯化饮食,并接受单次口服剂量的 1,2-二甲基肼 (DMH)。膳食脂肪的脂肪酸组成的差异主要限于十八碳烯酸酯的几何异构性,并且亚油酸含量相等(总能量的2%)。喂养约 15 个月后,DMH 治疗大鼠的结肠肿瘤发生率在两个脂肪组中几乎相同。在给予反式脂肪的大鼠中,粪便中性类固醇的排泄较高,而胆固醇向粪甾烷醇的转化较低。两个脂肪组之间粪便胆汁酸的排泄和组成没有显着差异。给予反式脂肪饮食的大鼠的血清胆固醇和生育酚水平往往较低。结果表明,反式单烯在 DMH 诱导的结肠肿瘤发生率方面的表现与顺式单烯非常相似,尽管肠道中的代谢事件存在特征性差异。
To investigate the effects of the difference in the geometry of dietary fatty acids on colon tumorigenesis, male rats were fed semipurified diets containing either partially hydrogenated corn oil (trans-monoene fat) or olive oil (cis-monoene fat) at the 10% level and received a single oral dosage of 1,2-dimethylhydrazine (DMH). The difference in the fatty acid composition of dietary fats was confined essentially to the geometrical isomerism of octadecenoate, and the linoleic acid content was made equivalent (2% of total energy). After about 15 mo of feeding, colon tumor incidence in DMH treated rats was nearly the same in both fat groups. Fecal neutral steroid excretion was higher, while the transformation of cholesterol to coprostanol was lower in rats given the trans-fat. There were no marked differences in the excretion and composition of fecal bile acids between two fat groups. Serum cholesterol and tocopherol levels of rats given trans-fat diets tended to be low. The results suggested that the trans-monoene behaves much like the cis-monoene in the incidence of DMH-induced colon tumors, although there were characteristic differences in metabolic events in the intestine.
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