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Insulin Resistance and NAFLD: A Dangerous Liaison beyond the Genetics

Manco, Melania·2017·Children
DOI 10.3390/children4080074PMC PMC5575596
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Abstract

Over the last decade, the understanding of the association between insulin resistance (IR) and non-alcoholic fatty liver disease (NAFLD) has dramatically evolved. There is clear understanding that carriers of some common genetic variants, i.e., the patatin-like phospholipase domain-containing 3 (PNPLA3) or the transmembrane 6 superfamily member 2 (TM6SF2) are at risk of developing severe forms of NAFLD even in the presence of reduced or absent IR. In contrast, there are obese patients with “metabolic” (non-genetically driven) NAFLD who present severe IR. Owing to the epidemic obesity and the high prevalence of these genetic variants in the general population, the number of pediatric cases with combination of genetic and metabolic NAFLD is expected to be very high. Gut dysbiosis, excessive dietary intake of saturated fats/fructose-enriched foods and exposure to some chemicals contribute all to both IR and NAFLD, adding further complexity to the understanding of their relationship. Once NAFLD is established, IR can accelerate the progression to the more severe form of liver derangement that is the non-alcoholic steatohepatitis.

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Figure 1 Summary of the mechanisms favoring intrahepatic accumulation of lipids that are, namely: increased de novo lipogenesis, reduced hepatic lipolysis (this mechanism can be effective in carriers of the PNPLA3 variant) and export as very low dense lipoproteins (VLDL). In patients with high visceral adipose (VAT) to subcutaneous (SAT) tissue ratio, impaired adipose tissue lipolysis caused overflow of lipids to ectopic tissues including the muscle tissue. At the level of the muscle tissue, fat accumulation results ultimately in systemic insulin resistance. Adipose tissue lipolysis contributes to control hepatic glucose production that is enhanced in patients with hepatic steatosis who have commonly impaired adipose tissue lipolysis.
Figure 1 Summary of the mechanisms favoring intrahepatic accumulation of lipids that are, namely: increased de novo lipogenesis, reduced hepatic lipolysis (this mechanism can be effective in carriers of the PNPLA3 variant) and export as very low dense lipoproteins (VLDL). In patients with high visceral adipose (VAT) to subcutaneous (SAT) tissue ratio, impaired adipose tissue lipolysis caused overflow of lipids to ectopic tissues including the muscle tissue. At the level of the muscle tissue, fat accumulation results ultimately in systemic insulin resistance. Adipose tissue lipolysis contributes to control hepatic glucose production that is enhanced in patients with hepatic steatosis who have commonly impaired adipose tissue lipolysis.CC BY · PubMed Central

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Research works printed but not linked: 42

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Metadata

Authors
Manco, M.
Venue
Children
Publisher
MDPI AG
Published
2017-08-14
Volume
4
Issue
8
Pages
74
ISSN
2227-9067
DOI
10.3390/children4080074
PMC
PMC5575596
Cited by
45
References
11
Language
en
Licence
creativecommons.org/licenses/by/4.0/ (vor)

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