• Media type: E-Article
  • Title: Plasma Concentrations of Afamin Are Associated With the Prevalence and Development of Metabolic Syndrome
  • Contributor: Kronenberg, Florian; Kollerits, Barbara; Kiechl, Stefan; Lamina, Claudia; Kedenko, Lyudmyla; Meisinger, Christa; Willeit, Johann; Huth, Cornelia; Wietzorrek, Georg; Altmann, Maria E.; Thorand, Barbara; Melmer, Andreas; Dähnhardt, Doreen; Santer, Peter; Rathmann, Wolfgang; Paulweber, Bernhard; Koenig, Wolfgang; Peters, Annette; Adham, Ibrahim M.; Dieplinger, Hans
  • Published: Ovid Technologies (Wolters Kluwer Health), 2014
  • Published in: Circulation: Cardiovascular Genetics, 7 (2014) 6, Seite 822-829
  • Language: English
  • DOI: 10.1161/circgenetics.113.000654
  • ISSN: 1942-325X; 1942-3268
  • Origination:
  • Footnote:
  • Description: Background— Afamin is a human plasma vitamin E–binding glycoprotein primarily expressed in the liver and secreted into the bloodstream. Because little is known about (patho)-physiological functions of afamin, we decided to identify phenotypes associated with afamin by investigating transgenic mice overexpressing the human afamin gene and performing large-scale human epidemiological studies. Methods and Results— Transgenic mice overexpressing afamin revealed increased body weight and serum concentrations of lipids and glucose. We applied a random-effects meta-analysis using age- and sex-adjusted baseline and follow-up investigations in the population-based Bruneck (n=826), Salzburg Atherosclerosis Prevention Program in Subjects at High Individual Risk (SAPHIR; n=1499), and KOoperative Gesundheitsforschung in der Region Augsburg (KORA) F4 studies (n=3060). Mean afamin concentrations were 62.5±15.3, 66.2±14.3, and 70.6±17.2 mg/L in Bruneck, SAPHIR, and KORA F4, respectively. Per 10 mg/L increment in afamin measured at baseline, the number of metabolic syndrome components increased by 19% (incidence rate ratio=1.19; 95% confidence interval [CI], 1.16–1.21; P =5.62×10 −64 ). With the same afamin increment used at baseline, we observed an 8% gain in metabolic syndrome components between baseline and follow-up (incidence rate ratio=1.08; 95% CI, 1.06–1.10; P =8.87×10 −16 ). Afamin concentrations at baseline were highly significantly related to all individual metabolic syndrome components at baseline and at follow-up. This observation was most pronounced for elevated waist circumference (odds ratio, 1.79; 95% CI, 1.54–2.09; P =4.15×10 −14 at baseline and odds ratio, 1.46; 95% CI, 1.31–1.63; P =2.84×10 −11 for change during follow-up) and for elevated fasting glucose concentrations (odds ratio, 1.46; 95% CI, 1.40–1.52; P =1.87×10 −69 and odds ratio, 1.46; 95% CI, 1.24–1.71; P =5.13×10 −6 , respectively). Conclusions— This study in transgenic mice and >5000 participants in epidemiological studies shows that afamin is strongly associated with the prevalence and development of metabolic syndrome and all its components.
  • Access State: Open Access