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Differential effects of dietary fat on the tissue-specific expression of the apolipoprotein A-I gene: relationship to plasma concentration of high density lipoproteins

Differential effects of dietary fat on the tissue-specific expression of the apolipoprotein A-I gene: relationship to plasma concentration of high density lipoproteins

Journal of Lipid Research 30(9): 1397-1403

Isocaloric substitution of polyunsaturated fat for saturated fat reduces concentrations of total plasma cholesterol and high density lipoproteins (HDL) in nonhuman primates. The biochemical mechanisms through which polyunsaturated fat lowers plasma HDL concentrations are not well understood but must involve changes in HDL production or HDL clearance from plasma, or both. To determine whether dietary polyunsaturated fat (P/S = 2.2) alters apolipoprotein (apo) A-I production, African green monkeys (Cercopithecus aethiops) were fed diets containing polyunsaturated fat or saturated fat (P/S = 0.3) each in combination with high (0.8 mg/kcal) and low (0.03 mg/kcal) amounts of dietary cholesterol. Animals fed polyunsaturated fat at either cholesterol level had lower plasma concentrations of total cholesterol and HDL cholesterol. Plasma apoA-I concentration was reduced by 16% by polyunsaturated fat in the high cholesterol group. The rate of hepatic apoA-I secretion, as estimated by the accumulation of perfusate apoA-I during recirculating liver perfusion, was reduced by 19% in animals consuming the high cholesterol, polyunsaturated fat diet. Hepatic apoA-I mRNA concentrations, as measured by DNA-excess solution hybridzation, also were reduced by 22% in the high cholesterol, polyunsaturated fat-fed animals. In contrast, intestinal apoA-I mRNA concenttraions were not altered by the type of dietary fat. Plasma apoA-II and hepatic apoA-II mRNA concentrations also were not altered by the type of dietary fat. These data indicate that dietary polyunsaturated fat can selectively after the expression of the apoA-I gene in a tissue-specific manner. Correlation analysis showed a strong relationship (r = +0.70, P < 0.001) between plasma apoA-I and hepatic apoA-I mRNA concentrations suggesting that the plasma apoA-I concentration is determined to a significant degree by factors that regulate hepatic apoA-I mRNA concentrations.

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Accession: 002072582

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PMID: 2513367

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