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(Arteriosclerosis, Thrombosis, and Vascular Biology. 2004;24:498.)
© 2004 American Heart Association, Inc.

Atherosclerosis and Lipoproteins

Changes in Dietary Fat Intake Alter Plasma Levels of Oxidized Low-Density Lipoprotein and Lipoprotein(a)

Marja-Leena Silaste; Maire Rantala; Georg Alfthan; Antti Aro; Joseph L. Witztum; Y. Antero Kesäniemi; Sohvi Hörkkö

From the Department of Internal Medicine and Biocenter Oulu (M.-L.S., M.R., Y.A.K., S.H.), University of Oulu, Oulu, Finland; the National Public Health Institute (G.A., A.A.), Mannerheimintie, Helsinki, Finland; and the Department of Medicine (J.L.W.), University of California San Diego, La Jolla, Calif.

Correspondence to Marja-Leena Silaste, Department of Internal Medicine, University of Oulu, P.O. Box 5000, FIN-90014 Oulu, Finland. E-mail Marja-Leena.Silaste{at}oulu.fi

Objective— To assess the effects of dietary modifications on oxidized low-density lipoprotein (LDL).

Methods and Results— Thirty-seven healthy women were fed two diets. Both diets contained a reduced amount of total and saturated fat. In addition, one diet was low in vegetables and the other was high in vegetables, berries, and fruit. The dietary intake of total fat was 70 g per day at baseline and decreased to 56 g (low-fat, low-vegetable diet) and to 59 g (low-fat, high-vegetable diet). The saturated fat intake decreased from 28 g to 20 g and to 19 g, and the amount of polyunsaturated fat intake increased from 11 g to 13 g and to 19 g (baseline; low-fat, low-vegetable; low-fat, high-vegetable; respectively). The amount of oxidized LDL in plasma was determined as the content of oxidized phospholipid per ApoB-100 using a monoclonal antibody EO6 (OxLDL-EO6). The median plasma OxLDL-EO6 increased by 27% (P<0.01) in response to the low-fat, low-vegetable diet and 19% (P<0.01) in response to the low-fat, high-vegetable diet. Also, the Lp(a) concentration was increased by 7% (P<0.01) and 9% (P=0.01), respectively.

Conclusion— Alterations in the dietary fat intake resulted in increased plasma concentrations of lipoprotein(a) and OxLDL-EO6.

Key Words: antioxidants • intervention • lipoprotein (a) • oxidized low-density lipoprotein • polyunsaturated fat

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