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

Zhou, You; Llaurado, Gemma; Oresic, Matej; Hyotylainen, Tuulia; Orho-Melander, Marju LU and Yki-Jarvinen, Hannele (2015) In Journal of Hepatology 62(3). p.657-663
Abstract
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:... (More)
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. (Less)
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author
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Contribution to journal
publication status
published
subject
keywords
Liver, Mass spectrometry, Magnetic resonance spectroscopy, Glucose, production, Lipolysis
in
Journal of Hepatology
volume
62
issue
3
pages
657 - 663
publisher
Elsevier
external identifiers
  • wos:000349855400023
  • pmid:25457209
  • scopus:84923064699
ISSN
0168-8278
DOI
10.1016/j.jhep.2014.10.010
language
English
LU publication?
yes
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b4c6034f-38aa-414b-8931-d76f470dff28 (old id 5305157)
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http://www.ncbi.nlm.nih.gov/pubmed/25457209?dopt=Abstract
date added to LUP
2015-05-04 08:39:37
date last changed
2017-09-24 03:16:29
@article{b4c6034f-38aa-414b-8931-d76f470dff28,
  abstract     = {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.},
  author       = {Zhou, You and Llaurado, Gemma and Oresic, Matej and Hyotylainen, Tuulia and Orho-Melander, Marju and Yki-Jarvinen, Hannele},
  issn         = {0168-8278},
  keyword      = {Liver,Mass spectrometry,Magnetic resonance spectroscopy,Glucose,production,Lipolysis},
  language     = {eng},
  number       = {3},
  pages        = {657--663},
  publisher    = {Elsevier},
  series       = {Journal of Hepatology},
  title        = {Circulating triacylglycerol signatures and insulin sensitivity in NAFLD associated with the E167K variant in TM6SF2},
  url          = {http://dx.doi.org/10.1016/j.jhep.2014.10.010},
  volume       = {62},
  year         = {2015},
}