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Integrative Biology

Decreased lipid metabolism but increased FA biosynthesis are coupled with changes in liver microRNAs in obese subjects with NAFLD

International Journal of Obesity volume 41, pages 620–630 (2017)Cite this article

Subjects

Abstract

Background/Objective:

Many controversies regarding the association of liver miRNAs with obesity and nonalcoholic fatty liver diseases (NAFLD) call for additional validations. This study sought to investigate variations in genes and hepatic miRNAs in a sample of obese patients with or without NAFLD and human hepatocytes (HH).

Subjects/Methods:

A total of 60 non-consecutive obese women following bariatric surgery were recruited. Subjects were classified as NAFLD (n=17), borderline (n=24) and controls (n=19) with normal enzymatic profile, liver histology and ultrasound assessments. Profiling of 744 miRNAs was performed in 8 obese women with no sign of hepatic disease and 11 NAFLD patients. Additional validation and expression of genes related to de novo fatty acid (FA) biosynthesis, uptake, transport and β-oxidation; glucose metabolism, and inflammation was tested in the extended sample. Induction of NAFLD-related genes and miRNAs was examined in HepG2 cells and primary HH treated with palmitic acid (PA), a combination of palmitate and oleic acid, or high glucose, and insulin (HG) mimicking insulin resistance in NAFLD.

Results:

In the discovery sample, 14 miRNAs were associated with NAFLD. Analyses in the extended sample confirmed decreased miR-139-5p, miR-30b-5p, miR-122-5p and miR-422a, and increased miR-146b-5p in obese subjects with NAFLD. Multiple linear regression analyses disclosed that NAFLD contributed independently to explain miR-139-5p (P=0.005), miR-30b-5p (P=0.005), miR-122-5p (P=0.021), miR-422a (P=0.007) and miR-146a (P=0.033) expression variance after controlling for confounders. Decreased miR-122-5p in liver was associated with impaired FA usage. Expression of inflammatory and macrophage-related genes was opposite to decreased miR-30b-5p, miR-139-5p and miR-422a, whereas increased miR-146b-5p was associated with FABP4 and decreased glucose metabolism and FA mobilization. In partial agreement, PA (but not HG) led to decreased miR-139-5p, miR-30b-5p, miR-422a and miR-146a in vitro, in parallel with increased lipogenesis and FA transport, decreased glucose metabolism and diminished FA oxidation.

Conclusion:

This study confirms decreased liver glucose and lipid metabolism but increased FA biosynthesis coupled with changes in five unique miRNAs in obese patients with NAFLD.

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Acknowledgements

This study was supported by the European Project FLORINASH-FP7-HEALTH-2009-2.4.5-1, the CIBER de la Fisiopatología de la Obesidad y la Nutrición (CIBERobn), by funds from the Agència de Gestió d’Ajuts Universitaris de Recerca (AGAUR, FI-DGR 2015 to Jèssica Latorre), and the Fondo Europeo de Desarrollo Regional (FEDER). The CIBERobn is an initiative from the Instituto de Salud Carlos III (ISCIII). This study is indebted to the IDIBGI Biobank, integrated in the Spanish National Biobank Network, for the sample and data procurement. Dr Josep M Mercader was supported by a Sara Borrell fellowship, also from the Instituto de Salud Carlos III (ISCIII). Dr Francisco J Ortega is the guarantor for this work as a whole, including study design, access to data and the decision to submit and publish the manuscript.

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Authors and Affiliations

  1. Department of Diabetes, Endocrinology and Nutrition (UDEN), Institut d’Investigació Biomédica de Girona (IdIBGi), Hospital of Girona ‘Dr Josep Trueta’ Carretera de França s/n, Girona, Spain

    J Latorre, J M Moreno-Navarrete, M Sabater, Ò Rovira, W Ricart, J M Fernández-Real & F J Ortega

  2. CIBER de la Fisiopatología de la Obesidad y la Nutrición (CIBERobn) and Instituto de Salud Carlos III (ISCIII), Madrid, Spain

    J M Moreno-Navarrete, M Sabater, W Ricart, J M Fernández-Real & F J Ortega

  3. Joint BSC-CRG-IRB Research Program in Computational Biology, Barcelona Supercomputing Center, Barcelona, Spain

    J M Mercader

  4. Department of Surgery, Hospital Dr. Josep Trueta of Girona, Girona, Spain

    J Gironès

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  1. J Latorre
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Latorre, J., Moreno-Navarrete, J., Mercader, J. et al. Decreased lipid metabolism but increased FA biosynthesis are coupled with changes in liver microRNAs in obese subjects with NAFLD. Int J Obes 41, 620–630 (2017). https://doi.org/10.1038/ijo.2017.21

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