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  • Title: Serum adipokines are associated with cholesterol metabolism in the metabolic syndrome.
    Author: Hallikainen M, Kolehmainen M, Schwab U, Laaksonen DE, Niskanen L, Rauramaa R, Pihlajamäki J, Uusitupa M, Miettinen TA, Gylling H.
    Journal: Clin Chim Acta; 2007 Aug; 383(1-2):126-32. PubMed ID: 17573060.
    Abstract:
    BACKGROUND: The purpose of this study was to investigate whether cholesterol metabolism is associated with serum adipokines and inflammatory markers. METHODS: In fifty-eight subjects with impaired fasting glucose or impaired glucose tolerance and features of the metabolic syndrome cholesterol metabolism was assayed with serum non-cholesterol sterol ratios to cholesterol, surrogate markers of synthesis (cholesterol precursors) and dietary absorption % of cholesterol (cholestanol and plant sterols) and related them to serum adiponectin, leptin, high-sensitive C-reactive protein (hs-CRP), interleukin-6 (IL-6) and tumor necrosis factor-alpha (TNF-alpha). RESULTS: Adiponectin was negatively related to synthesis markers (e.g. desmosterol r=-0.371, P<0.01), and positively to absorption markers (e.g. cholestanol r=0.269, P<0.05). Leptin was associated with synthesis markers (e.g. desmosterol r=0.271, P<0.05) and negatively with absorption markers (e.g. sitosterol r=-0.278, P<0.05). Hs-CRP was negatively associated with absorption markers (e.g. sitosterol r=-0.407, P<0.001). IL-6 and TNF-alpha were not related to cholesterol metabolism. When dividing the subjects into tertiles by the serum desmosterol/cholestanol ratio, the I tertile (high synthesis/low absorption) was associated with low adiponectin concentrations, high BMI and serum leptin concentrations (P<0.05 for all). CONCLUSIONS: Adiponectin, leptin and hs-CRP were associated with variables of cholesterol metabolism. A high ratio of cholesterol synthesis to absorption is characterized by high serum leptin and low adiponectin concentrations.
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