Hepatic steatosis and PNPLA3 I148M variant are associated with serum Fetuin-A independently of insulin resistance

Raffaela Rametta, Massimiliano Ruscica, Paola Dongiovanni, Chiara Macchi, Anna L. Fracanzani, Liliana Steffani, Silvia Fargion, Paolo Magni, Luca Valenti

Research output: Contribution to journalArticle

Abstract

Background & Aims: Fetuin-A is a liver-derived peptide associated with insulin resistance. Aim of this cross-sectional study was to evaluate whether Fetuin-A is increased in patients with nonalcoholic fatty liver disease (NAFLD) vs. healthy subjects without metabolic abnormalities and the association with insulin resistance and liver damage. To investigate the causal relationship between fatty liver and Fetuin-A, we also analysed whether the inherited I148M PNPLA3 variant modulates Fetuin-A. Methods: In 137 patients with histological NAFLD, complete metabolic characterization, PNPLA3 genotype, and in 260 healthy subjects without metabolic alterations, Fetuin-A was measured by enzyme-linked immunoabsorbent assay. Results: Serum Fetuin-A was higher in NAFLD patients than in controls (P <0·0001), independently of age, sex, BMI, insulin resistance, dyslipidemia, adiponectin, PNPLA3 I148M and ALT levels (OR 1·006 95% CI 1·003-1·11; P = 0·003). In NAFLD patients, Fetuin-A was associated with steatosis severity (P = 0·03) and metabolic syndrome features, but not with hepatic inflammation. At multivariate analysis, Fetuin-A levels were associated with BMI, triglycerides, hyperglycemia and PNPLA3 I148M (P = 0·034) independently also of age, sex and ALT levels. As PNPLA3 I148M is a strong and inherited determinant of liver fat without affecting insulin resistance and lipid levels, these data suggest that steatosis has a causal role in determining serum Fetuin-A levels. Conclusions: Liver fat accumulation and the I148M variant of PNPLA3 are associated with serum Fetuin-A levels independently of insulin resistance. Fetuin-A may be implicated in the pathogenesis of metabolic complications associated with NAFLD.

Original languageEnglish
Pages (from-to)627-633
Number of pages7
JournalEuropean Journal of Clinical Investigation
Volume44
Issue number7
DOIs
Publication statusPublished - 2014

Keywords

  • Fetuin-A
  • Insulin resistance
  • Nonalcoholic fatty liver disease
  • Pnpla3
  • Steatosis

ASJC Scopus subject areas

  • Medicine(all)
  • Clinical Biochemistry
  • Biochemistry

Fingerprint Dive into the research topics of 'Hepatic steatosis and PNPLA3 I148M variant are associated with serum Fetuin-A independently of insulin resistance'. Together they form a unique fingerprint.

  • Cite this