Hepatic Glucose Uptake Is Increased in Association with Elevated Serum γ-Glutamyl Transpeptidase and Triglyceride

Background Subjects with fatty liver disease (FLD) can show increased hepatic 2-deoxy-2-(F-18)fluoro-d-glucose (FDG) uptake, but the role of hepatic inflammation has not been explored. We investigated whether hepatic inflammatory response, as implicated by elevated serum markers, is associated with increased liver FDG uptake in FLD. Liver sonography and FDG positron emission tomography was performed in 331 asymptomatic men with nonalcoholic FLD (NAFLD), 122 with alcoholic FLD (AFLD), and 349 controls. Mean standard uptake value (SUV) of liver FDG uptake was compared to cardiac risk factors and serum markers of liver injury. Hepatic FDG mean SUV was increased in NAFLD (2.40 +/- A 0.25) and AFLD groups (2.44 +/- A 0.25) compared to controls (2.28 +/- A 0.26; both P < 0.001). Both FLD groups also had higher serum gamma-glutamylranspeptidase (GGT), triglyceride (TG), hepatic transaminases, and LDL. High GGT and TG levels were independent determinants of increased FDG uptake for both FLD groups. Hepatic mean SUV significantly increased with high compared to low GGT for NAFLD (2.48 +/- A 0.28 vs. 2.37 +/- A 0.24), AFLD (2.51 +/- A 0.27 vs. 2.39 +/- A 0.23), and control groups (2.39 +/- A 0.22 vs. 2.26 +/- A 0.26). High TG increased hepatic mean SUV in AFLD and control groups. Furthermore, serum GGT and TG levels significantly correlated to hepatic mean SUV in all three groups. Hepatic FDG uptake is closely associated with elevated TG and GGT regardless of the presence of FLD. Thus, inflammation response may play a major role in increased hepatic glucose uptake.