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Cerivastatin Improves Insulin Sensitivity and Insulin Secretion in Early-State Obese Type 2 Diabetes

¹ Lipid and Atherosclerosis Unit, University Hospital Reina Sofía, Cordoba, Spain
² Biochemical Laboratory, University Hospital Reina Sofía, Cordoba, Spain
³ School of Medicine, University of Córdoba, Córdoba, Spain

In a double-blind, placebo-controlled, randomized crossover study, 15 stable mild hyperglycemic patients without treatment and with features of metabolic syndrome were treated with cerivastatin (0.4 mg/day) or placebo for 3 months. The insulin sensitivity index during the euglycemic-hyperinsulinemic clamp (EHC; 5.4 mmol/l; 80 mU · m^-2 · min^-1) was increased by cerivastatin treatment (66.39 ± 3.9 nmol · lean body mass [LBM]^-1 · min^-1 · pmol^-1 · l^-1) as compared with placebo (58.37 ± 3.69 nmol · LBM^-1 · min^-1 · pmol^-1 · l^{- 1}; P < 0.01) by 13.7%. Glucose oxidation during EHC was significantly higher with statin treatment (16.1 ± 1.37 µmol · LBM^-1 · min^-1) as compared with placebo (14.58 ± 1.48 µmol · LBM^-1 · min^-1; P < 0.05). During hyperinsulinemia (800 pmol/l) in EHC steady-state, lipid oxidation was significantly decreased and respiratory quotient was significantly increased with statin treatment (0.33 ± 0.05 mg · LBM^-1 · min^{- 1}, 0.94 ± 0.01) as compared with placebo (0.48 ± 0.06 mg · LBM^-1 · min^-1, 0.91 ± 0.01; P < 0.01 and P < 0.05, respectively). During statin treatment, the first-phase insulin response increased from 2.07 ± 0.28 to 2.82 ± 0.38 pmol · l^-1 · pmol^-1 (P < 0.05). The second phase of insulin responses examined by C-peptide and insulin levels averaged during the hyperglycemic clamp (20 mmol/l) was unchanged. In conclusion, this study demonstrates that 0.4 mg cerivastatin therapy improves first-phase insulin secretion and increases insulin-mediated glucose uptake and respiratory quotient in the early state of obese type 2 diabetes.

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