OJ-257 High Serum Gamma-Glutamyl Transferase is a Marker for Clustering of Metabolic Risk Factors in the Japanese General Population(Diabetes / Obesity / Metabolic syndrome(03)(H),Oral Presentation (Japanese),The 72nd Annual Scientific Meeting of the Japanese Circulation Society)
Toshie SegawaToshiyuki OnodaKazuyoshi ItaiKozo TannoMasaki OhsawaKiyomi SakataKazuko KawamuraFumitaka TanakaKenyu SatohTomohiro TakahashiAkira OkayamaMotoyuki INakamura
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A rapidly growing body of evidence demonstrates important associations between the metabolic syndrome, characterized by a cluster of risk factors or phenotypes that include dyslipidemia, central obesity, hypertension, and hyperinsulinemia, and both cardiovascular disease and type 2 diabetes. The purpose of the present study was to characterize the metabolic syndrome in a sample of 432 individuals from 68 Japanese-American families, using factor analysis of quantitative phenotypes, and to estimate the heritability of these independent factors. Using nine characteristic phenotypes that included LDL particle size and C-reactive protein (CRP), factor analysis identified three multivariate factors interpreted as lipids, body fat/insulin/glucose/CRP, and blood pressure, explaining 65% of the variance. Heritability analysis revealed significant genetic effects on all of the factors: lipids (h(2) = 0.52, P < 0.001), body fat/insulin/glucose/CRP (h(2) = 0.27, P = 0.016), and blood pressure (h(2) = 0.25, P = 0.026). This analysis shows that independent, multivariate factors of the metabolic syndrome are heritable, demonstrating genetic influences on the underlying pathophysiological mechanisms of the syndrome.
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The Metabolic Syndrome represents a specific clustering of cardiovascular risk factors. One of several recently proposed definitions encompasses 3 or more of the following 5 abnormalities: waist circumference > 102 cm in men or > 88 cm in women, serum triglyceride level > or = 150 mg/dL, high-density lipoprotein cholesterol level < 40 mg/dL in men or < 50 mg/dL in women, blood pressure (BP) > or = 130/> or = 85 mm Hg and serum glucose > or = 110 mg/dL. The diagnosis of Metabolic Syndrome allows early recognition of an increased risk of cardiovascular disease. African Americans have the highest coronary heart disease mortality of any ethnic group in the United States. African-American women and Hispanic men and women have the highest prevalence of the Metabolic Syndrome. This phenomenon is attributable mainly to the disproportionate occurrence of elevated BP, obesity, and diabetes in African Americans, and the high prevalence of obesity and diabetes in Hispanics. Management of the Metabolic Syndrome consists primarily of modification or reversal of the root causes and direct therapy of the risk factors. The first strategy involves weight reduction and increased physical activity, both of which can improve all components of the syndrome. The second strategy often involves drug treatment of the individual risk factors to further improve BP, lipids, and glucose thereby decreasing the risk of cardiovascular disease. This comprehensive review is provided as part of the educational activities of the African-American Lipid and Cardiovascular Council (AALCC).
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