Inverse modifications of heart and liver alpha-tocopherol status by various dietary n-6/n-3 polyunsaturated fatty acid ratios
| Autor: | Henri Portugal, Raymond Calaf, Huguette Lafont, Michèle André, A M Pauli, Magali Chautan, Gilles Nalbone, Monique Charbonnier, Jeannie Leonardi |
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| Rok vydání: | 1990 |
| Předmět: |
Male
QD415-436 Biology Biochemistry chemistry.chemical_compound Endocrinology Dietary Fats Unsaturated Animals Homeostasis Vitamin E Food science chemistry.chemical_classification Myocardium food and beverages Fatty acid Rats Inbred Strains Cell Biology Fish oil Lipids Eicosapentaenoic acid Rats Liver chemistry Docosahexaenoic acid alpha-Tocopherol Corn oil Polyunsaturated fatty acid |
| Zdroj: | Journal of Lipid Research, Vol 31, Iss 12, Pp 2201-2208 (1990) |
| ISSN: | 0022-2275 |
| DOI: | 10.1016/s0022-2275(20)42107-8 |
| Popis: | The effect of dietary n-6/n-3 fatty acid ratio on alpha-tocopherol homeostasis was investigated in rats. Animals were fed diets containing fat (17% w/w) in which the n-6/n-3 ratio varied from 50 to 0.8. This was achieved by combining corn oil, fish oil, and lard. The polyunsaturated to saturated ratio and total alpha-tocopherol remained constant in all diets. Results showed that enrichment of n-3 polyunsaturated fatty acids in the diet, even at a low amount (3.9% w/w), resulted in a dramatic reduction of blood alpha-tocopherol concentration, which, in fact, is the result of a decrease in plasma lipids, since the alpha-tocopherol to total lipids ratio was not significantly altered. The most striking effect observed was a considerable alpha-tocopherol enrichment (x 4) of the heart as its membranes became enriched with n-3 polyunsaturated fatty acids. This process appeared even with a low amount of fish oil (3.9% w/w) added to the diet. Accordingly, a strong positive correlation was found between heart alpha-tocopherol and docosahexaenoic acid (r = 0.86) or docosahexaenoic acid plus eicosapentaenoic acid levels (r = 0.84). Conversely, the liver alpha-tocopherol level dropped dramatically when n-3 polyunsaturated fatty acids were gradually added to the diet. It is concluded that fish oil intake dramatically alters the alpha-tocopherol homeostasis in rats. |
| Databáze: | OpenAIRE |
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