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Biochim Biophys Acta. 2016 Apr;1861(4):342-51. doi: 10.1016/j.bbalip.2015.12.019. Epub 2015 Dec 30.

MicroRNA-192* impairs adipocyte triglyceride storage.

Author information

1
Minerva Foundation Institute for Medical Research, Biomedicum 2U, FI-00290 Helsinki, Finland.
2
Minerva Foundation Institute for Medical Research, Biomedicum 2U, FI-00290 Helsinki, Finland; Department of Medicine, University of Helsinki, FI-00014 Finland.
3
University of Helsinki and Helsinki University Hospital, Obstetrics and Gynecology, FI-00029 HUS, Helsinki, Finland; Folkhälsan Research Center, FI-00290 Helsinki, Finland.
4
Minerva Foundation Institute for Medical Research, Biomedicum 2U, FI-00290 Helsinki, Finland; National Institute for Health and Welfare/Public Health Genomics Unit, Biomedicum, FI-00290 Helsinki, Finland.
5
Department of Surgery, Helsinki University Central Hospital, FI-000290 HUS, Helsinki, Finland.
6
National Institute for Health and Welfare/Public Health Genomics Unit, Biomedicum, FI-00290 Helsinki, Finland; Institute for Molecular Medicine Finland FIMM, University of Helsinki, FI-00014 Helsinki, Finland.
7
Division of Pediatric Endocrinology and Diabetes, Department of Pediatrics and Adolescent Medicine, Ulm University Medical Center, D-89075 Ulm, Germany.
8
Minerva Foundation Institute for Medical Research, Biomedicum 2U, FI-00290 Helsinki, Finland; Department of Anatomy, Faculty of Medicine, University of Helsinki, FI-00014 Helsinki, Finland. Electronic address: vesa.olkkonen@helsinki.fi.

Abstract

We investigated the expression of miR-192* (miR-192-3p) in the visceral adipose tissue (VAT) of obese subjects and its function in cultured human adipocytes. This miRNA is a 3' arm derived from the same pre-miRNA as miR-192 (miR-192-5p) implicated in type 2 diabetes, liver disease and cancers, and is predicted to target key genes in lipid metabolism. In morbidly obese subjects undergoing bariatric surgery preceded by a very low calorie diet, miR-192* in VAT correlated negatively (r=-0.387; p=0.046) with serum triglyceride (TG) and positively with high-density lipoprotein (HDL) concentration (r=0.396; p=0.041). In a less obese patient cohort, the miRNA correlated negatively with the body mass index (r=-0.537; p=0.026). To characterize the function of miR-192*, we overexpressed it in cultured adipocytes and analyzed the expression of adipogenic differentiation markers as well as cellular TG content. Reduced TG and expression of the adipocyte marker proteins aP2 (adipocyte protein 2) and perilipin 1 were observed. The function of miR-192* was further investigated by transcriptomic profiling of adipocytes expressing this miRNA, revealing impacts on key lipogenic genes. A number of the mRNA alterations were validated by qPCR. Western analysis confirmed a marked reduction of the lipogenic enzyme SCD (stearoyl coenzyme A desaturase-1), the fatty aldehyde dehydrogenase ALDH3A2 (aldehyde dehydrogenase 3 family member A2) and the high-density lipoprotein receptor SCARB1 (scavenger receptor B, type I). SCD and ALDH3A2 were demonstrated to be direct targets of miR-192*. To conclude, the present data identify miR-192* as a novel controller of adipocyte differentiation and lipid homeostasis.

KEYWORDS:

Adipogenesis; Obesity; SGBS; Transcriptome; miR-192-3p

PMID:
26747651
DOI:
10.1016/j.bbalip.2015.12.019
[Indexed for MEDLINE]

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