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Tazarotene induced gene 2 (TIG2) is a novel adipokine that is believed to be a mediator for the adipose tissue inflammation that occurs in obesity. The present study compared TIG2 levels between healthy and type 2 diabetic women matched for age and body composition. We also aimed to assess the relationship of serum TIG2 levels with body composition, insulin resistance, dyslipidemia and diabesity in Saudi adult women. This observation case-control study was conducted at the Departments of Physiology and Medicine, Saud University Riyadh, Saudi Arabia, from September 2013 to April 2014. A total of 100 subjects were recruited, including 51 adult diabetic females, and a control group consisting of 49 healthy females. Finally 80 subjects were selected as per inclusion criteria. In the finally selected group, 45 of were diabetics and 35 were healthy subjects matched for age, BMI and body composition with age ranging between 30 and 65years. Body composition analysis was estimated using Bioelectrical impendence analyzer. Fasting 10ml venous blood samples were analyzed for glycemic markers, lipids and TIG2. Insulin resistance indexes were calculated by homeostasis model assessment of insulin resistance (HOMA-IR) and quantitative insulin sensitivity check index (QUICKI) using standard formulas. The two groups were matched for age, BMI, body fat percentage (BF%), basal metabolic rate (BMR), truncal fat and WHR. Serum TIG2 levels were higher in diabetics than controls (256.09pm57.01 vs 305.63pm73.66, p=0.001). Systolic blood pressure (p=0.001), weight (p=0.040), fat mass (p=0.045) and visceral fat (p=0.025) were found to be significantly higher in diabetics when compared to controls. FBS, HBA1C, LDL, TG, insulin, HOMA-IR, QUICKIE and TIG2 were significantly higher and HDL was significantly lower in diabetics compared to controls. In Spearman’s correlation analysis. TIG2 correlated positively with age (r=0.300, p=0.007), WHR (r=0.250, p=0.026), weight (r=0.270, p=0.016), BMI (r=0.364, p=0.003), BF% (r=0.325, p=0.003), fat mass (r=0.250, p=0.026), Visceral fat (r=0.356, p=0.001) and truncal fat mass (r=0.249, p=0.027), serum basal insulin (r=0.354, p=0.001) and HOMA IR (r=0.275, p=0.015), while it correlated inversely with QUICKI (r=0.-283, p=0.012). In multiple linear regression analysis body age (r=0.236, p=0.023), BF% (r=0.265, p=0.014) and basal insulin (r=0.265, p=0.014) levels were independent predictors of TIG2. Serum TIG2 levels are elevated in patients with type 2 DM compared to healthy control subjects and are positively correlated with adiposity and insulin resistance in Saudi adult women with type 2 DM. Our study indicates that the determination of body fat may have a key role in prediction and detection of the increased cardiometabolic risk in Type 2 DM

journal of the saudi heart association

25. Novel adipokine tazarotene induced gene 2 correlations with increased cardiovascular risk determined by body composition, insulin resistance, dyslipidemia and diabesity in Saudi women