Research Repository

Retinol-Binding Protein 4 and Insulin Resistance in Polycystic Ovary Syndrome

Hutchison, Samantha K and Harrison, Cheryce L and Stepto, Nigel and Meyer, Caroline and Teede, Helena J (2008) Retinol-Binding Protein 4 and Insulin Resistance in Polycystic Ovary Syndrome. Diabetes Care, 31 (7). pp. 1427-1432. ISSN 0149-5222

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OBJECTIVE— Polycystic ovary syndrome (PCOS) is an insulin-resistant state with insulin resistance being an established therapeutic target; however, measurement of insulin resistance remains challenging. We aimed to 1) determine serum retinol-binding protein 4 (RBP4) levels (purported to reflect insulin resistance) in women with PCOS and control subjects, 2) examine the relationship of RBP4 to conventional markers of insulin resistance, and 3) examine RBP4 changes with interventions modulating insulin resistance in overweight women with PCOS. RESEARCH DESIGN AND METHODS— At baseline, 38 overweight women (BMI 27 kg/m2) with PCOS and 17 weight-matched control subjects were compared. Women with PCOS were then randomly assigned to 6 months of a higher-dose oral contraceptive pill (OCP) (35 g ethinyl estradiol/2 mg cyproterone acetate) or metformin (1 g b.i.d.). Outcome measures were insulin resistance (total insulin area under the curve) on an oral glucose tolerance test, RBP4, and metabolic/inflammatory markers. RESULTS— Overweight women with PCOS were more insulin resistant than control subjects, yet RBP4 levels were not different in women with PCOS versus those in control subjects (35.44.3 vs. 28.93.1 g/ml, P0.36). RBP4 correlated with cholesterol and triglycerides but not with insulin resistance. Metformin improved insulin resistance by 35%, whereas the OCP worsened insulin resistance by 33%. However, RBP4 increased nonsignificantly in both groups (43.7  6.3 vs. 42.6  5.5 g/ml, P  0.92). CONCLUSIONS— Overweight women with PCOS were more insulin resistant than control subjects, but this finding was not reflected by RBP4 levels. RBP4 correlated with lipid levels but not with insulin resistance markers. RBP4 levels did not change when insulin resistance was reduced by metformin or increased by the OCP. These data suggest that RBP4 is not a useful marker of insulin resistance in PCOS but may reflect other metabolic features of this condition.

Item Type: Article
Uncontrolled Keywords: ResPubID16181, polycystic ovary syndrome (PCOS), insulin resistance
Subjects: FOR Classification > 1116 Medical Physiology
Faculty/School/Research Centre/Department > Centre for Ageing, Rehabilitation, Exercise & Sport Science (CARES)
FOR Classification > 1101 Medical Biochemistry and Metabolomics
SEO Classification > 970111 Expanding Knowledge in the Medical and Health Sciences
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Depositing User: VUIR
Date Deposited: 26 Aug 2011 00:27
Last Modified: 17 Feb 2015 00:41
DOI: 10.2337/dc07-2265
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Citations in Scopus: 25 - View on Scopus

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