© 1997 American Heart Association, Inc.
Articles |
Interactions Between Lifestyle-Related Factors and the ApoE Polymorphism on Plasma Lipids and Apolipoproteins
The EARS Study
From the Institut National de la Santé et de la Recherche Médicale, Paris, France (J.M.A.B., L.T.); the National Public Health Institute, Helsinki, Finland (C.E.); the Institute for Medical Biology and Human Genetics, Innsbruck, Austria (H.-J.M.); Gaubius Laboratory TNO-PG, Leiden, Netherlands (L.M.H.); the Laboratory of Lipoprotein Chemistry, Ghent, Belgium (M.R.); and the Institute of Biochemistry, Glasgow, Scotland (D.S.J.O.).
Correspondence to Laurence Tiret, INSERM U258, Hôpital Broussais, 96 rue Didot, 75674 Paris Cedex 14, France. E-mail: tiret{at}hbroussais.fr
Abstract To elucidate how the apolipoprotein (apo) E polymorphism and modifiable factors interact in explaining plasma lipid and apolipoprotein levels, we studied 1448 young adults (18 to 26 years old), participating in the European Atherosclerosis Research Study (EARS). Venous blood was collected after an overnight fast. Modifiable factors, eg, body mass index (BMI), waist-to-hip ratio (WHR), tobacco and alcohol consumption, and physical activity, were determined by using standardized protocols. Associations of modifiable factors with apoE levels were homogeneous across apoE phenotypes. In contrast, correlations of BMI with total cholesterol and apoB levels, as well as correlations between WHR and apoB, were significantly (P<.05 to P<.01) stronger in E2 carriers than in subjects with other phenotypes. Total cholesterol and apoB levels were comparable in E2 carriers in the upper tertile of BMI or WHR to those in E3/3 subjects, suggesting that the lowering effect of the E2 allele was no longer present. The inverse association between the plasma cholesteryl linoleate-to-oleate ratio, a marker for the dietary polyunsaturated-to-saturated fatty acid ratio, and triglycerides was also stronger in E2 carriers (-0.33 versus -0.17 in E3/3 and -0.24 in E4 carriers). Associations with other modifiable factors were notably consistent across apoE phenotypes. Gender and modifiable factors explained three times more (31%) of the interindividual variation in apoB levels in E2 carriers than in E3/3 subjects (9%) or E4 carriers (14%), mainly due to a larger variance explained by BMI. Our results suggest that the apoE polymorphism acts in a relatively uniform manner, independently of lifestyle. However, the associations of adiposity to total cholesterol and apoB levels appear to be stronger in apoE2 carriers.
Key Words: lifestyle • apolipoprotein E polymorphism • apolipoproteins • lipids • adiposity
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