A Novel Insulin Resistance Index to Monitor Changes in Insulin Sensitivity and Glucose Tolerance: the ACT NOW Study

作者：Tripathy Devjit; Cobb Jeff E; Gall Walter; Adam Klaus Peter; George Tabitha; Schwenke Dawn C; Banerji MaryAnn; Bray George A; Buchanan Thomas A; Clement Stephen C; Henry Robert R; Kitabchi Abbas E; Mudaliar Sunder; Ratner Robert E; Stentz Frankie B; Reaven Peter D; Musi Nicolas; Ferrannini Ele; DeFronzo Ralph A^*

来源：Journal of Clinical Endocrinology & Metabolism, 2015, 100(5): 1855-1862.

DOI：10.1210/jc.2014-3824

Objective: The objective was to test the clinical utility of Quantose M-Q to monitor changes in insulin sensitivity after pioglitazone therapy in prediabetic subjects. Quantose M-Q is derived from fasting measurements of insulin, alpha-hydroxybutyrate, linoleoyl-glycerophosphocholine, and oleate, three nonglucose metabolites shown to correlate with insulin-stimulated glucose disposal.
Research Design and Methods: Participants were 428 of the total of 602 ACT NOW impaired glucose tolerance (IGT) subjects randomized to pioglitazone (45 mg/d) or placebo and followed for 2.4 years. At baseline and study end, fasting plasma metabolites required for determination of Quantose, glycated hemoglobin, and oral glucose tolerance test with frequent plasma insulin and glucose measurements to calculate the Matsuda index of insulin sensitivity were obtained.
Results: Pioglitazone treatment lowered IGT conversion to diabetes (hazard ratio = 0.25; 95% confidence interval = 0.13-0.50; P < .0001). Although glycated hemoglobin did not track with insulin sensitivity, Quantose M-Q increased in pioglitazone-treated subjects (by 1.45 [3.45] mg.min(-1).kg(wbm)(-1)) (median [interquartile range]) (P < .001 vs placebo), as did the Matsuda index (by 3.05 [4.77] units; P < .0001). Quantose M-Q correlated with the Matsuda index at baseline and change in the Matsuda index from baseline (rho, 0.85 and 0.79, respectively; P < .0001) and was progressively higher across closeout glucose tolerance status (diabetes, IGT, normal glucose tolerance). In logistic models including only anthropometric and fasting measurements, Quantose M-Q outperformed both Matsuda and fasting insulin in predicting incident diabetes.
Conclusions: In IGT subjects, Quantose M-Q parallels changes in insulin sensitivity and glucose tolerance with pioglitazone therapy. Due to its strong correlation with improved insulin sensitivity and its ease of use, Quantose M-Q may serve as a useful clinical test to identify and monitor therapy in insulin-resistant patients.

• 出版日期2015-5