Research Article Details

Article ID: A21640
PMID: 25163357
Source: Hepatol Res
Title: Lower levels of insulin-like growth factor-1 standard deviation score are associated with histological severity of non-alcoholic fatty liver disease.
Abstract: AIM: Growth hormone (GH) deficiency may be associated with histological progression of non-alcoholic fatty liver disease (NAFLD) which includes non-alcoholic fatty liver (NAFL) and non-alcoholic steatohepatitis (NASH). Insulin-like growth factor 1 (IGF-1) is mainly produced by hepatocytes and its secretion is stimulated by GH. Our aim was to determine whether more histologically advanced NAFLD is associated with low circulating levels of IGF-1 in Japanese patients. METHODS: Serum samples were obtained in 199 Japanese patients with biopsy-proven NAFLD and in 2911 sex- and age-matched healthy people undergoing health checkups. The serum levels of IGF-1 were measured using a commercially available immunoradiometric assay. The standard deviation scores (SDS) of IGF-1 according to age and sex were also calculated in NAFLD patients. RESULTS: The serum IGF-1 levels in NAFLD patients were significantly lower (median, 112&#8201;ng/mL) compared with the control population (median, 121&#8201;ng/mL, P&#8201;<&#8201;0.0001). IGF-1 SDS less than -2.0 SD from median were found in 11.6% of 199 patients. NASH patients exhibited significantly lower levels of IGF-1 SDS (n&#8201;=&#8201;130; median, -0.7) compared with NAFL patients (n&#8201;=&#8201;69; median, -0.3; P&#8201;=&#8201;0.026). The IGF-1 SDS values decreased significantly with increasing lobular inflammation (P&#8201;<&#8201;0.001) and fibrosis (P&#8201;<&#8201;0.001). In multiple regressions, the association between the IGF-1 SDS values and the severity of NAFLD persisted after adjusting for age, sex and insulin resistance. CONCLUSION: Low levels of circulating IGF-1 may have a role in the development of advanced NAFLD, independent of insulin resistance. Supplementation with GH/IGF-1 may be a candidate for the treatment of NASH.
DOI: 10.1111/hepr.12408