BACKGROUND & AIMS: Liver fat is increased in type 2 diabetes. We determined whether it is associated with impaired insulin clearance and to what extent insulin resistance, impaired insulin clearance, or secretion contribute to fasting hyperinsulinemia. We also examined whether insulin suppression of serum free fatty acid (FFA) correlates with liver fat. METHODS: We compared 68 type 2 diabetic patients and age-, gender-, and body mass index (BMI)-matched nondiabetic subjects. Liver fat was determined by (1)H-MRS, body composition by magnetic resonance imaging, and insulin clearance and action on hepatic glucose production (HGP), glucose uptake, and serum FFA by the euglycemic insulin clamp technique (insulin 0.3 mU/kg x min) combined with infusion of [3-(3)H]glucose. RESULTS: Liver fat was 54% higher and insulin clearance 24% lower in type 2 diabetic patients than nondiabetic subjects. The percent suppression of both HGP and serum FFA by insulin were comparable, but serum insulin concentrations were significantly higher (34 mU/L [interquartile range, 30-39 mU/L] vs 25 mU/L [interquartile range, 22-30 mU/L]; P < .0001) in the type 2 diabetic than the nondiabetic subjects. When this difference was taken into account, both hepatic and adipose tissue insulin sensitivity were impaired in the type 2 diabetic subjects. Liver fat correlated with insulin clearance (r = -0.41; P = .001), and hepatic (r = 0.46; P = .0001) and adipose tissue (r = 0.55; P < .0001) insulin sensitivity. Hepatic but not peripheral insulin sensitivity was independently associated with liver fat content. Insulin clearance and secretion were independent determinants of fasting serum insulin. CONCLUSIONS: We conclude that increased liver fat, impaired insulin clearance, and hepatic and adipose tissue insulin resistance characterize type 2 diabetic patients.
BACKGROUND & AIMS: Liver fat is increased in type 2 diabetes. We determined whether it is associated with impaired insulin clearance and to what extent insulin resistance, impaired insulin clearance, or secretion contribute to fasting hyperinsulinemia. We also examined whether insulin suppression of serum free fatty acid (FFA) correlates with liver fat. METHODS: We compared 68 type 2 diabeticpatients and age-, gender-, and body mass index (BMI)-matched nondiabetic subjects. Liver fat was determined by (1)H-MRS, body composition by magnetic resonance imaging, and insulin clearance and action on hepatic glucose production (HGP), glucose uptake, and serum FFA by the euglycemic insulin clamp technique (insulin 0.3 mU/kg x min) combined with infusion of [3-(3)H]glucose. RESULTS: Liver fat was 54% higher and insulin clearance 24% lower in type 2 diabeticpatients than nondiabetic subjects. The percent suppression of both HGP and serum FFA by insulin were comparable, but serum insulin concentrations were significantly higher (34 mU/L [interquartile range, 30-39 mU/L] vs 25 mU/L [interquartile range, 22-30 mU/L]; P < .0001) in the type 2 diabetic than the nondiabetic subjects. When this difference was taken into account, both hepatic and adipose tissue insulin sensitivity were impaired in the type 2 diabetic subjects. Liver fat correlated with insulin clearance (r = -0.41; P = .001), and hepatic (r = 0.46; P = .0001) and adipose tissue (r = 0.55; P < .0001) insulin sensitivity. Hepatic but not peripheral insulin sensitivity was independently associated with liver fat content. Insulin clearance and secretion were independent determinants of fasting serum insulin. CONCLUSIONS: We conclude that increased liver fat, impaired insulin clearance, and hepatic and adipose tissue insulin resistance characterize type 2 diabeticpatients.
Authors: Naoki Kumashiro; Derek M Erion; Dongyan Zhang; Mario Kahn; Sara A Beddow; Xin Chu; Christopher D Still; Glenn S Gerhard; Xianlin Han; James Dziura; Kitt Falk Petersen; Varman T Samuel; Gerald I Shulman Journal: Proc Natl Acad Sci U S A Date: 2011-09-19 Impact factor: 11.205
Authors: M G Radaelli; F Martucci; S Perra; S Accornero; G Castoldi; G Lattuada; G Manzoni; G Perseghin Journal: J Endocrinol Invest Date: 2017-11-30 Impact factor: 4.256
Authors: Mark O Goodarzi; Jinrui Cui; Yii-Der I Chen; Willa A Hsueh; Xiuqing Guo; Jerome I Rotter Journal: Am J Physiol Endocrinol Metab Date: 2011-05-31 Impact factor: 4.310
Authors: Ebe D'Adamo; Anna M G Cali; Ram Weiss; Nicola Santoro; Bridget Pierpont; Veronika Northrup; Sonia Caprio Journal: Diabetes Care Date: 2010-08 Impact factor: 17.152