Research Article Details

Article ID: A49358
PMID: 35779256
Source: J Clin Endocrinol Metab
Title: The GH/IGF-1 axis is associated with intrahepatic lipid content and hepatocellular damage in overweight/obesity.
Abstract: CONTEXT: Obesity is a state of relative growth hormone (GH) deficiency, and GH has been identified as a candidate disease-modifying target in nonalcoholic fatty liver disease (NAFLD) because of its lipolytic and anti-inflammatory properties. However, the GH/IGF-1 axis has not been well characterized in NAFLD. OBJECTIVE: Investigate GH and IGF-1 in relation to intrahepatic lipid content (IHL) and markers of hepatocellular damage and fibrosis in NAFLD. DESIGN: Cross-sectional. PARTICIPANTS: 102 adults (43% women), 19-67yo, BMI &#8805;25&#160;kg/m 2, without type 2 diabetes. MEASURES: IHL by magnetic resonance spectroscopy; NAFLD was defined by &#8805;5% IHL. Peak-stimulated GH in response to GH releasing hormone and arginine. Serum IGF-1 (LC/MS). RESULTS: There was no difference in mean age, BMI or sex distribution in NAFLD vs controls. Mean (&#177;SD) IHL was higher in NAFLD vs controls (21.8&#177;13.3% vs 2.9&#177;1.1%, p<0.0001). Mean peak-stimulated GH was lower in NAFLD vs controls (9.0&#177;6.3 vs 15.4&#177;11.2&#160;ng/mL, p=0.003), including after controlling for age, sex, visceral adipose tissue and fasting glucose. In a stepwise model, peak-stimulated GH predicted 14.6% of the variability in IHL (p=0.004). Higher peak-stimulated GH was also associated with lower ALT. Higher IGF-1 was associated with lower risk of liver fibrosis by Fibrosis-4 scores. CONCLUSIONS: Individuals with NAFLD have lower peak-stimulated GH but similar IGF-1 levels versus controls. Higher peak-stimulated GH is associated with lower IHL and less hepatocellular damage. Higher IGF-1 is associated with more favorable fibrosis risk scores. These data implicate GH and IGF-1 as potential disease modifiers in the development and progression of NAFLD.
DOI: 10.1210/clinem/dgac405