Research
Print page Print page
Switch language
Rigshospitalet - a part of Copenhagen University Hospital
Published

Nonalcoholic Fatty Liver Disease Impairs the Liver-Alpha Cell Axis Independent of Hepatic Inflammation and Fibrosis

Research output: Contribution to journalJournal articleResearchpeer-review

DOI

  1. Assessment of rapid hepatic glycogen synthesis in humans using dynamic 13C magnetic resonance spectroscopy

    Research output: Contribution to journalJournal articleResearchpeer-review

  • Julie Steen Pedersen
  • Marte Opseth Rygg
  • Viggo Bjerregaard Kristiansen
  • Beth Hærstedt Olsen
  • Reza Rafiolsadat Serizawa
  • Jens Juul Holst
  • Sten Madsbad
  • Lise Lotte Gluud
  • Flemming Bendtsen
  • Nicolai Jacob Wewer Albrechtsen
View graph of relations

Nonalcoholic fatty liver disease (NAFLD) is associated with impaired hepatic actions of glucagon and insulin. Glucagon and amino acids are linked in an endocrine feedback circuit, the liver-alpha cell axis, that may be disrupted by NAFLD. We investigated how NAFLD severity affects glucagon and insulin resistance in individuals with obesity and whether bariatric surgery improves these parameters. Plasma and liver biopsies from 33 individuals with obesity (collectively, OBE) were obtained before and 12 months after bariatric surgery (Roux-en-Y gastric bypass [RYGB] or sleeve gastrectomy [SG]). Nine healthy control individuals (collectively, CON) undergoing cholecystectomy were used as a comparison group. The NAFLD activity score (NAS) was used to subdivide study participants into the following groups: OBE-no steatosis, OBE+steatosis, and nonalcoholic steatohepatitis (NASH) and/or grade 2 fibrosis (Fib) (OBE-NASH-Fib). Measurements of amino acids by targeted metabolomics and glucagon were performed. Glucagon, amino acids (P < 0.05), and the glucagon-alanine index, a validated surrogate marker of glucagon resistance, were increased in OBE by 60%, 56%, and 61%, respectively, when compared with CON but irrespective of NAFLD severity. In contrast, markers of hepatic insulin resistance increased concomitantly with NAS. Hyperglucagonemia resolved in OBE-no steatosis and OBE+steatosis but not in OBE-NASH-Fib (median, 7.0; interquartile range, 5.0-9.8 pmol/L), regardless of improvement in insulin resistance and NAS. The type of surgery that participants underwent had no effect on metabolic outcomes. Conclusion: Glucagon resistance to amino acid metabolism exists in individuals with NAFLD independent of NAS severity. Patients with NASH showed persistent hyperglucagonemia 12 months after bariatric surgery, indicating that a disrupted liver-alpha cell may remain in NAFLD despite major improvement in liver histology.

Original languageEnglish
JournalHepatology Research
Volume4
Issue number11
Pages (from-to)1610-1623
Number of pages14
ISSN1386-6346
DOIs
Publication statusPublished - Nov 2020

ID: 61231643