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Sökning: WFRF:(Syvanne M)

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  • Mero, N., et al. (författare)
  • Postprandial elevation of ApoB-48-containing triglyceride-rich particles and retinyl esters in normolipemic males who smoke
  • 1997
  • Ingår i: Arterioscler Thromb Vasc Biol. - 1079-5642. ; 17:10, s. 2096-102
  • Tidskriftsartikel (refereegranskat)abstract
    • Smokers have an increased risk for coronary artery disease (CAD), which can only partly be explained by fasting lipoprotein changes. Recent studies have indicated that smokers express metabolic abnormalities characteristic of insulin resistance syndrome. A preliminary study reported an increased postprandial triglyceride (TG) response in smokers compared with nonsmokers. To investigate the effect of smoking on postprandial lipemia, a fat-rich mixed meal (837 kcal, 63 g of fat) was served to 12 healthy smokers and 12 controls with similar fasting lipoprotein profiles, body composition, and lifestyles. Blood was drawn before and 3, 4, 6, and 8 hours postprandially, and triglyceride-rich lipoprotein (TRL) fractions (chylomicrons, VLDL1, VLDL2, and IDL) were separated with density gradient ultracentrifugation. Pre- and postprandial TG, retinyl esters (RE), apolipoprotein B-48 (apoB-48) and B-100 (apoB-100) were measured in each fraction. Smokers showed a significantly increased postprandial TG response in chylomicrons, VLDL1, and VLDL2. The areas under the incremental curve (AUIC) of apoB-48 in chylomicrons (2.83 +/- 0.84 versus 0.56 +/- 0.17; P < .05) and VLDL1 (10.17 +/- 1.96 versus 2.95 +/- 2.44; P = < .01) were markedly higher in smokers than in controls. Changes of RE responses of all TRL fractions were consistent with those of apoB-48. Postprandial apoB-100 concentrations and lipolytic enzymes were similar between the two groups. In conclusion, smokers have the syndrome of impaired TG tolerance because of defective clearance of chylomicrons and their remnants. Prolonged residence time of atherogenic remnant particles may constitute a significant risk factor for CAD in smokers.
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