Abstract
BackgroundRetinol-binding protein 4 (RBP4), a novel adipokine secreted by adipocytes and the liver, has elevated levels in type 2 diabetes mellitus (T2DM). However, its association with human metabolic diseases remains controversial. The present study was designed to investigate the associations of plasma RBP4 levels with oxidative stress, inflammatory markers, and metabolic syndrome (MetS) in a Chinese population.MethodWe evaluated plasma RBP4 levels in a cross-sectional sample of 1748 Chinese men and women aged 50 to 70 years in Guangzhou using an in-house developed and validated sandwich ELISA. Plasma glucose, insulin, lipid profile, serum adiponectin, adipocyte fatty acid-binding protein (A-FABP), 8-iso-prostaglandin F2α (8-iso PGF2α), 13-(S)-hydroxyoctadecadienoic acid (13-HODE), high-sensitivity C-reactive protein (hsCRP), interleukin 6 (IL6), monocyte chemotactic protein 1 (MCP1) and tumor necrosis factor α (TNFα) were all measured. MetS was defined according to the updated National Cholesterol Education Program Adult Treatment Panel III criteria for Asian Americans.ResultsCirculating RBP4 levels were positively correlated with A-FABP (r = 0.104, P < 0.001), 8-iso PGF2α (0.236, P < 0.001), and 13-HODE (0.204, P < 0.001) and were inversely correlated with HDL cholesterol (r = −0.072, P = 0.004). After multivariable adjustment, the RBP4 levels were strongly associated with MetS and its components. The ORs (95% CIs) for the comparisons of the extreme quartiles of RBP4 were 3.46 (2.87, 4.42) for MetS, 5.92 (4.47, 8.02) for hypertriglyceridemia, 1.42 (1.11, 1.68) for reduced HDL cholesterol, 1.87 (1.48, 2.36) for central obesity and 2.74 (2.15, 3.36) for hyperglycemia (all P < 0.001). When we further controlled for adipokines, markers of oxidative stress and proinflammatory response, the association of RBP4 with central obesity was abolished but not the association with other MetS components.ConclusionsPlasma RBP4 levels are associated with an adverse profile of oxidative stress and inflammatory markers and an increased risk of MetS in this Chinese population. These associations are independent of conventional risk factors.
Highlights
Metabolic syndrome (MetS) is a clustering of multiple metabolic abnormalities, including central obesity, dyslipidemia, elevated blood pressure, hyperglycemia and insulin resistance
Circulating Retinol-binding protein 4 (RBP4) levels were positively correlated with adipocyte fatty acid-binding protein (A-FABP) (r = 0.104, P < 0.001), 8-iso 8-isoprostaglandin F2α (PGF2α) (0.236, P < 0.001), and 13-(S)-hydroxyoctadecadienoic acid (13-HODE) (0.204, P < 0.001) and were inversely correlated with highdensity lipoprotein (HDL) cholesterol (r = −0.072, P = 0.004)
When we further controlled for adipokines, markers of oxidative stress and proinflammatory response, the association of RBP4 with central obesity was abolished but not the association with other metabolic syndrome (MetS) components
Summary
Metabolic syndrome (MetS) is a clustering of multiple metabolic abnormalities, including central obesity, dyslipidemia, elevated blood pressure, hyperglycemia and insulin resistance. Many studies show strong correlations of serum RBP4 levels with the severity of insulin resistance and obesity and with certain components of MetS, including hypertension [12], dyslipidemia [12,13], waist/hip ratio [13], cardiovascular disease [14,15], and intra-abdominal fat mass [16], others do not demonstrate these correlations [17,18,19] These inconsistencies may result from differences in age, ethnicity, population size, and the methodological techniques used [20]. The present study was designed to investigate the associations of plasma RBP4 levels with oxidative stress, inflammatory markers, and metabolic syndrome (MetS) in a Chinese population
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