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    The effects of dietary fat quality on cholesterol and lipoprotein metabolism in the guinea pig

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    azu_td_1340708_sip1_m.pdf
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    Author
    Ibrahim, Jamal Bachir Taher, 1961-
    Issue Date
    1990
    Keywords
    Agriculture, Food Science and Technology.
    Health Sciences, Nutrition.
    Advisor
    McNamara, Donald J.
    
    Metadata
    Show full item record
    Publisher
    The University of Arizona.
    Rights
    Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
    Abstract
    The effects of dietary saturated versus polyunsaturated fat (7.5%; w/w) on sterol balance and lipoprotein metabolism were studied in guinea pigs. The polyunsaturated diet significantly reduced plasma cholesterol and triglyceride levels by 34% and 40%, respectively. Polyunsaturated dietary fat significantly reduced the percentage of cholesteryl ester in low density lipoprotein (LDL) while the relative proportion of LDL-phospholipids was increased. The ratio of LDL surface to core components in the polyunsaturated fed animals was significantly higher (P .02). Dietary fat quality had no effect on either sterol balance or hepatic 3-hydroxy-3-methylglutaryl coenzyme A reductase activity. Hepatic free and esterfield cholesterol levels were significantly higher in the polyunsaturated fat fed group (P .01). Feeding polyunsaturated fat caused a significant (1.9-fold) increase in hepatic membrane LDL (apo B/E) receptor binding. The data indicate that the hypocholesterolemic effect of polyunsaturated fat is not attributable to changes in cholesterol metabolism but rather to a redistribution of plasma cholesterol to tissues due to increased tissue LDL receptor binding.
    Type
    text
    Thesis-Reproduction (electronic)
    Degree Name
    M.S.
    Degree Level
    masters
    Degree Program
    Graduate College
    Nutrition and Food Sciences
    Degree Grantor
    University of Arizona
    Collections
    Master's Theses

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