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Background  It is well-established that nonalcoholic fatty liver disease (NAFLD) is associated with type 2 diabetes mellitus (T2DM). Complement-C1q TNF-related protein 5 (CTRP5) is a novel adipokine involved in the regulation of lipid and glucose metabolism. We aimed to assess plasma levels of CTRP5 in patients with NAFLD (n = 22), T2DM (n = 22) and NAFLD with T2DM (NAFLD + T2DM) (n = 22) in comparison with healthy subjects (n = 21) and also to study the association between CTRP5 levels and NAFLD and diabetes-related parameters.    Methods  All subjects underwent anthropometric assessment, biochemical evaluation and liver stiffness (LS) measurement. Insulin resistance (IR) was determined by the homeostasis model assessment (HOMA). Plasma CTRP5 levels were measured by enzyme-linked immunosorbent assay.    Results  We found significantly lower plasma levels of CTRP5 in patients with NAFLD + T2DM, NAFLD and T2DM (122.52 ± 1.92, 124.7 ± 1.82 and 118.31 ± 1.99 ng/ml, respectively) in comparison with controls (164.96 ± 2.95 ng/ml). In the whole study population, there was a significant negative correlations between CTRP5 and body mass index (r = −0.337; p = 0.002), fasting blood glucose (FBG) (r = −0.488; p < 0.001), triglyceride (TG) (r = −0.245; p = 0.031), HOMA-IR (r = −0.492; p < 0.001), insulin(r = −0.338; p = 0.002), LS (r = −0.544; p < 0.001), alanine aminotransferase (ALT) (r = −0.251; p = 0.027), waist-to-hip ratio (WHR) (r = −0.352; p = 0.002) and waist circumference (WC) (r = −0.357; p = 0.001). After adjustment for BMI, decrease in circulating levels of CTRP5 remained as a significant risk factor for NAFLD, T2DM and NAFLD + T2DM. The receiver operating characteristic (ROC) curves of circulating CTRP5 in predicting NAFLD and T2DM demonstrated an area under the curve (AUC) of 0.763 in T2DM, and 0.659 in NAFLD + T2DM.    Conclusions  It appears that the decreased levels of CTRP5 contribute to the increased risk of T2DM and NAFLD.    Electronic supplementary material  The online version of this article (doi:10.1186/s13098-015-0099-z) contains supplementary material, which is available to authorized users.

diabetology and metabolic syndrome

The association of circulating levels of complement-C1q TNF-related protein 5 (CTRP5) with nonalcoholic fatty liver disease and type 2 diabetes: a case–control study