Gamma-glutamyl transpeptidase and the metabolic syndrome

Objective. To analyse the associations serum gamma-glutamyl transpeptidase activity (GTP) and the components of the metabolic syndrome. Design. Cross-sectional, observational study of hypertensive patients and c ontrols. Setting. The participating subjects visited the research laboratory of the Department of Internal Medicine, University of Oulu, Oulu, Finland. Subjects. A total of 1045 Caucasians, 40-59 years of age, consisting of 261 drug-treated hypertensive men, 258 drug-treated hypertensive women and 526 age- and ses-matched controls. Main outcome measures. The associations between GTP and the cardiovascular risk factors were analysed through multiple regression and logistic methods and by GTP tertiles. The independent effect of GTP on different insulin me asures, calculated from the values of 2 h of oral glucose tolerance test, w as estimated after concurrent adjustment for age, obesity and alcohol consu mption. Results. GTP correlated highly significantly with the components of the met abolic syndrome. The correlation coefficient were 0.33 between GTP and body mass index, 0.25 between GTP and systolic blood pressure in control men (P = 0.0001), 0.39 between GTP and triglycerides. and 0.32 between CTP and fa sting insulin in hypertensive women (P = 0.0001). The association between G TP and blood pressure remained significant only at uptight measurements in controls. All insulin measures hart a significant positive association with increasing GTP tertiles in all the study groups (e.g. fasting insulin 8.1 mU L-1 in the lowest and 11.0 mU L-1 in the highest tertile in control wome n, P = 0.0001), with the exception of fasting insulin in control men. In a pooled logistic analysis after adjustment for age, body mass index, alcohol consumption and gender, the independent predictors of the metabolic syndro me were body mass index. uric acid, total cholesterol and GTP (for log-tran sformed GTP odds ratio 4.0. 95% CI: 2.80-5.69). Conclusions. There are significant associations between GTP and the compone nts of the metabolic syndrome. Elevated levels of GTP may not always indica te increased alcohol consumption, but may also suggest the existence of the metabolic syndrome with its subsequent deleterious consequences.