TY - JOUR
T1 - Non Alcoholic Fatty Liver Disease is Associated with Increased GHBP and Reduced GH/IGF-I Levels
AU - Fusco, Alessandra
AU - Miele, Luca
AU - D'Uonnolo, A
AU - Forgione, Alessandra
AU - Riccardi, Laura
AU - Cefalo, Consuelo
AU - Barini, Angelina
AU - Bianchi, Alfredo
AU - Giampietro, A
AU - Cimino, V
AU - Landolfi, Raffaele
AU - Grieco, Alessandro
AU - De Marinis, L.
PY - 2011
Y1 - 2011
N2 - Introduction: Non-alcoholic fatty liver disease (NAFLD) has been described in adult GH deficiency syndrome. Furthermore, chronic liver disease can be associated with significant changes in levels of IGF-I, GH-binding protein (GHBP), IGF-binding proteins (IGFBPs) and acid-labile subunit (ALS). However, the effect of liver steatosis on the GHBP production has not been investigated yet. Aim of the study: to explore if GH secretion and/or levels of IGF-I, IGFBP-3, ALS and GHBP could be altered in obese patients in relation to the presence of liver steatosis. Materials and methods: A total of 115 obese patients (BMI> 30) were enrolled in the protocol (65 patients with liver steatosis and 50 age- and BMI-matched controls). In all patients the following parameters were studied: serum levels of glucose, insulin, the HOMA index, IGF-I, GHBP, IGFBP-3, ALS and GH after GHRH and arginine stimulation test. Results: As expected, subjects with NAFLD had blood glucose, insulin, HOMA-R significantly higher than controls, indicating a more severe insulin-resistance state in NAFLD. Furthermore, patients with NAFLD had higher levels of GHBP and IGFBP-3 and lower GH peak and IGF-I levels as compared to controls. No difference was found in ALS levels between the groups. In a multivariate analysis, GHBP was positively associated with hepatic steatosis while IGF-1 was negatively associated with hepatic steatosis. Conclusions: This study demonstrates that in NAFLD patients the GHBP levels are increased and that the GH/IGF-I axis is significantly altered probably leading to reduced IGF-I bioavailability at tissue level.
AB - Introduction: Non-alcoholic fatty liver disease (NAFLD) has been described in adult GH deficiency syndrome. Furthermore, chronic liver disease can be associated with significant changes in levels of IGF-I, GH-binding protein (GHBP), IGF-binding proteins (IGFBPs) and acid-labile subunit (ALS). However, the effect of liver steatosis on the GHBP production has not been investigated yet. Aim of the study: to explore if GH secretion and/or levels of IGF-I, IGFBP-3, ALS and GHBP could be altered in obese patients in relation to the presence of liver steatosis. Materials and methods: A total of 115 obese patients (BMI> 30) were enrolled in the protocol (65 patients with liver steatosis and 50 age- and BMI-matched controls). In all patients the following parameters were studied: serum levels of glucose, insulin, the HOMA index, IGF-I, GHBP, IGFBP-3, ALS and GH after GHRH and arginine stimulation test. Results: As expected, subjects with NAFLD had blood glucose, insulin, HOMA-R significantly higher than controls, indicating a more severe insulin-resistance state in NAFLD. Furthermore, patients with NAFLD had higher levels of GHBP and IGFBP-3 and lower GH peak and IGF-I levels as compared to controls. No difference was found in ALS levels between the groups. In a multivariate analysis, GHBP was positively associated with hepatic steatosis while IGF-1 was negatively associated with hepatic steatosis. Conclusions: This study demonstrates that in NAFLD patients the GHBP levels are increased and that the GH/IGF-I axis is significantly altered probably leading to reduced IGF-I bioavailability at tissue level.
KW - NAFLD
KW - NAFLD
UR - http://hdl.handle.net/10807/14203
U2 - 10.1111/j.1365-2265.2011.04291.x
DO - 10.1111/j.1365-2265.2011.04291.x
M3 - Article
SN - 1365-2265
VL - 2011
SP - 1365
EP - 1367
JO - Clinical Endocrinology
JF - Clinical Endocrinology
ER -