Background & Aims: The liver is a crucial organ at the crossroads of iron and glucose metabolism. The aim of the study was to assess intra-hepatic iron in young patients with non-alcoholic fatty liver disease (NAFLD) and its association with insulin resistance and severity of liver damage. Methods: Intrahepatic iron content was assessed (Pearl's stain grade) in 66 patients (41 males, age 3.3-17.6 years) with biopsy-proven NAFLD. Mutations of the Hereditary Hemochromatosis (HFE) gene were determined by sequence allele-specific polymerase chain reaction. Insulin resistance was estimated by means of the Oral Glucose Tolerance Test and the Insulin Sensitivity Index (ISI); the Insulino-Genic Index was also calculated. Tumor necrosis factor-alpha and interleukin-6 were measured. Results: Low-mild intra-hepatic iron deposition was observed in one out of five children (n = 15, 22%), and it was not associated with HFE mutations, carried by 17 patients (26%). Among carriers of HFE mutations, four had siderosis. No abnormalities were observed in systemic indices of iron balance. Serum ferritin was within normal adult ranges in all patients (33.6 +/- 7.6 ng/ml), but it was correlated with ISI (r(o) = -0.361: p = 0.003). No significant difference was observed in insulin sensitivity, iron balance, inflammatory milieu, and liver histology between patients with and without hepatic siderosis. Conclusions: In young obese individuals with NAFLD, despite normal peripheral iron parameters, mild intra-hepatic iron deposition is a frequent finding, but it is not associated with insulin resistance or severity of liver damage. Longitudinal studies are required to define the long-term relevance of these findings.
|Titolo:||Early interplay of intra-hepatic iron and insulin resistance in children with nonalcoholic fatty liver disease|
|Parole Chiave:||ferritin; Iron; Insulin resistance; Insulin secretion; Hepcidin; Hereditary hemocromatosis; Non-alcoholic fatty liver disease; Non-alcoholic steatohepatitis|
|Settore Scientifico Disciplinare:||Settore MED/09 - Medicina Interna|
|Data di pubblicazione:||set-2011|
|Digital Object Identifier (DOI):||10.1016/j.jhep.2010.12.007|
|Appare nelle tipologie:||01 - Articolo su periodico|