Citation: Journal of Clinical Endocrinology & Metabolism. 100(5):1855-62, 2015 May..Journal: The Journal of clinical endocrinology and metabolism.ISSN: 0021-972X.Full author list: Tripathy D; Cobb JE; Gall W; Adam KP; George T; Schwenke DC; Banerji M; Bray GA; Buchanan TA; Clement SC; Henry RR; Kitabchi AE; Mudaliar S; Ratner RE; Stentz FB; Reaven PD; Musi N; Ferrannini E; DeFronzo RA.UI/PMID: 25603459.Subject(s): Adult | Aged | *Blood Glucose/me [Metabolism] | Diabetes Mellitus, Type 2/me [Metabolism] | *Diabetes Mellitus, Type 2/pc [Prevention & Control] | Female | *Glucose Intolerance/di [Diagnosis] | Glucose Intolerance/me [Metabolism] | Glucose Tolerance Test | Humans | *Hypoglycemic Agents/tu [Therapeutic Use] | Insulin/bl [Blood] | *Insulin Resistance/ph [Physiology] | Male | Middle Aged | *Prediabetic State/dt [Drug Therapy] | Prediabetic State/me [Metabolism] | *Thiazolidinediones/tu [Therapeutic Use] | Treatment OutcomeInstitution(s): MedStar Health Research InstituteActivity type: Journal Article.Medline article type(s): Journal Article | Randomized Controlled Trial | Research Support, N.I.H., ExtramuralDigital Object Identifier: http://dx.doi.org/10.1210/jc.2014-3824 (Click here)Abbreviated citation: J Clin Endocrinol Metab. 100(5):1855-62, 2015 May.Local Holdings: Available online through MWHC library: 1999- June 2013, Available in print through MWHC library: 1999 - 2006.Abstract: 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.Abstract: 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.Abstract: 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).kgwbm(-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.Abstract: 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.