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Photo: KG Pressfoto

Marju Orho-Melander

Professor

Photo: KG Pressfoto

Circulating triacylglycerol signatures and insulin sensitivity in NAFLD associated with the E167K variant in TM6SF2

Author

  • You Zhou
  • Gemma Llaurado
  • Matej Oresic
  • Tuulia Hyotylainen
  • Marju Orho-Melander
  • Hannele Yki-Jarvinen

Summary, in English

Background & Aims: The Glu167Lys (E167K) variant in the transmembrane 6 superfamily member 2 protein (TM6SF2) was recently shown to influence liver fat (LFAT) content. We aimed at studying how this variant influences circulating triacylglycerol (TAG) signatures and whether it influences hepatic or adipose tissue insulin sensitivity. Methods: We genotyped 300 Finnish subjects for the E167K (rs58542926) variant in TM6SF2 and for the I148M (rs738409) variant in the patatin-like phospholipase domain-containing protein 3 (PNPLA3) in whom LFAT was measured using H-1-MRS and circulating lipids by UPLC-MS. We compared the plasma lipidome between E167K carriers (TM6SF2(EK/KK)) and non-carriers (TM6SF2(EE)), and between three groups of NAFLD: (i) carriers of the E167K but not of the I148M variant in PNPLA3 ('TM6SF2 NAFLD'), (ii) carriers of the I148M but not of the E167K variant ('PNPLA3 NAFLD'), and (iii) non-carriers of either risk allele ('Non-risk NAFLD'). Hepatic and adipose tissue insulin sensitivities were measured using the euglycemic hyperinsulinemic clamp technique combined with infusion of [3-H-3]glucose in 111 subjects. Results: The LFAT content was 34% higher in the TM6SF2(EK/KK) (13.07 +/- 1.57%) than in the TM6SF2(EE) group (9.77 +/- 0.58%, p = 0.013). The effect of insulin on glucose production and lipolysis were significantly higher in the TM6SF2(EK/KK) than in the TM6SF2(EE) group. Comparison of the three NAFLD groups with similar LFATs showed that both the 'TM6SF2 NAFLD' and 'PNPLA3 NAFLD' had significantly lower triglyceride levels and were characterized by lower levels of most common TAGs compared to the 'Non-risk NAFLD' group. Conclusions: We conclude that the E167K variant in TM6SF2 is associated with a distinct subtype of NAFLD, characterized by preserved insulin sensitivity with regard to lipolysis, hepatic glucose production and lack of hypertriglyceridemia despite a clearly increased LFAT content. (C) 2014 European Association for the Study of the Liver. Published by Elsevier B.V. All rights reserved.

Department/s

  • Diabetes - Cardiovascular Disease
  • EXODIAB: Excellence of Diabetes Research in Sweden
  • EpiHealth: Epidemiology for Health

Publishing year

2015

Language

English

Pages

657-663

Publication/Series

Journal of Hepatology

Volume

62

Issue

3

Document type

Journal article

Publisher

Elsevier

Topic

  • Gastroenterology and Hepatology

Keywords

  • Liver
  • Mass spectrometry
  • Magnetic resonance spectroscopy
  • Glucose
  • production
  • Lipolysis

Status

Published

Research group

  • Diabetes - Cardiovascular Disease

ISBN/ISSN/Other

  • ISSN: 0168-8278