Angiopoietin-like protein 8/betatrophin correlates with hepatocellular lipid content independent of insulin resistance in non-alcoholic fatty liver disease patients

Abstract

Aims/Introduction: To explore angiopoietin-like protein 8 (ANGPTL-8) levels, and its association with hepatocellular lipid content (HCL) and insulin resistance in patients with different extents of non-alcoholic fatty liver disease (NAFLD). Materials and Methods: In 48 adults were recruited, of which 12 had no NAFLD (HCL < 5.5%; group 1), 18 had mild NAFLD (5.5% ≤ HCL < 10.0%; group 2) and 18 had moderate-to-severe NAFLD (HCL ≥ 10.0%; group 3). The peripheral insulin sensitivity of all participants was monitored by a hyperinsulinemic-euglycemic clamp (M value), as well as the magnetic resonance image of HCL. Serum ANGPTL-8, blood glucose levels and lipid profiles were also recorded in the study. Results: Group 3 had a worse metabolic profile, and had the highest ANGPTL-8 level (1,129 ± 351 pg/mL vs 742 ± 252 pg/mL, 765 ± 301 pg/mL, P = 0.001) compared with those in group 1 and group 2. In all metabolic profiles, HCL positively correlated the strongest with ANGPTL-8 (r = 0.436, P = 0.042). Multivariate stepwise linear regression analysis showed ANGPTL-8 and alanine aminotransferase were independent determinants of HCL (P = 0.002, P < 0.001, respectively), and these two indexes explained 67.4% of the variation of HCL (P < 0.001). Conclusions: ANGPTL-8 was positively correlated with hepatocellular lipid content independent of obesity and insulin resistance, indicating that ANGPTL-8 might be a new and important important predictor of the severity of NAFLD.