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26 October 2011

Waist circumference, ghrelin and selected adipose tissue-derived adipokines as predictors of insulin resistance in obese patients: Preliminary results

Mariusz Stepien, Kinga Rosniak-Bak, Marek Paradowski, Malgorzata Misztal, Krzysztof Kujawski, Maciej Banach, Jacek Rysz

DOI: 10.12659/MSM.882030

Med Sci Monit 2011; 17(11): PR13-18

Abstract

Background: The aim of the study was to estimate the association between anthropometric obesity parameters, serum concentrations of ghrelin, resistin, leptin, adiponectin and homeostasis model assessment (HOMA-IR) in obese non-diabetic insulin-sensitive and insulin-resistant patients.
Material/Methods: Study subjects included 37 obese (body mass index [BMI] ≥30 kg/m2) out-clinic patients aged 25 to 66 years. Insulin resistance was evaluated by HOMA-IR. Serum fasting concentrations of glucose, insulin, ghrelin, adiponectin, resistin and leptin were measured by using the ELISA method. Body weight, waist and hip circumferences were measured to calculate BMI and waist-to-hip ratio (WHR) values for all the patients. According to HOMA-IR, patients were divided into two groups: A, insulin sensitive (n=19); and B, insulin resistant (n=18).
Results: Patients with insulin resistance have greater mean waist circumference (WC) higher mean serum insulin level and leptin concentration, but lower concentrations of adiponectin and ghrelin. In the insulin-sensitive patient group we observed positive correlations between BMI and HOMA-IR, WC and HOMA-IR, and adiponectin and leptin, and negative correlations between ghrelin and HOMA-IR, WC and adiponectin, and WHR and adiponectin. In the insulin-resistant group, there was a positive correlation between resistin and ghrelin and a negative correlation between WHR and leptin.
Conclusions: Waist circumference, adiponectin, leptin and ghrelin are associated with insulin resistance and may be predictors of this pathology.

Keywords: Insulin Resistance - physiology, Insulin - blood, Ghrelin - blood, Enzyme-Linked Immunosorbent Assay, Body Weights and Measures, Body Mass Index, Biological Markers - blood, Adipokines - blood, Obesity - physiopathology, Waist Circumference - physiology

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Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750