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Maternal obesity downregulates microRNA let-7g expression, a possible mechanism for enhanced adipogenesis during ovine fetal skeletal muscle development

International Journal of Obesity volume 37, pages 568–575 (2013)Cite this article

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Abstract

Background:

Obesity in women of childbearing age is increasing at an alarming rate. Growing evidence shows that maternal obesity induces detrimental effects on offspring health, including pre-disposition to obesity. We have shown that maternal obesity increases fetal intramuscular adipogenesis at mid-gestation. However, the mechanisms are poorly understood. MicroRNAs (miRNAs) regulate mRNA stability. We hypothesized that maternal obesity alters fetal muscle miRNA expression, thereby influencing intramuscular adipogenesis.

Methods:

Non-pregnant ewes received a control diet (Con, fed 100% of National Research Council (NRC) recommendations, n=6) or obesogenic diet (OB; 150% NRC recommendations, n=6) from 60 days before to 75 days after conception when the fetal longissimus dorsi (LD) muscle was sampled and miRNA expression analyzed by miRNA microarray. One of miRNAs with differential expression between Con and OB fetal muscle, let-7g, was further tested for its role in adipogenesis and cell proliferation in C3H10T1/2 cells.

Results:

A total of 155 miRNAs were found with a signal above 500, among which, three miRNAs, hsa-miR-381, hsa-let-7g and bta-miR-376d, were differentially expressed between Con and OB fetuses, and confirmed by quantitative real-time PCR (QRT-PCR) analyses. Reduced expression of miRNA let-7g, an abundantly expressed miRNA, in OB fetal muscle was correlated with higher expression of its target genes. Overexpression of let-7g in C3H10T1/2 cells reduced their proliferation rate. Expression of adipogenic markers decreased in cells overexpressing let-7g, and the formation of adipocytes was also reduced. Overexpression of let-7g decreased expression of inflammatory cytokines.

Conclusion:

Fetal muscle miRNA expression was altered due to maternal obesity, and let-7g downregulation may enhance intramuscular adipogenesis during fetal muscle development in the setting of maternal obesity.

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Acknowledgements

The work was supported by NIH 1R01HD067449, 1R03HD057506, and USDA-NRI 2008–35206–18826.

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Authors and Affiliations

  1. Department of Animal Science, University of Wyoming, Laramie, WY, USA

    X Yan, Y Huang, J-X Zhao, C J Rogers, M-J Zhu, S P Ford & M Du

  2. Department of Obstetrics and Gynecology, Center for Pregnancy and Newborn Research, University of Texas, Health Sciences Center, San Antonio, TX, USA

    P W Nathanielsz

  3. Department of Animal Sciences, Washington State University, Pullman, WA, USA

    M Du

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Correspondence to M Du.

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Yan, X., Huang, Y., Zhao, JX. et al. Maternal obesity downregulates microRNA let-7g expression, a possible mechanism for enhanced adipogenesis during ovine fetal skeletal muscle development. Int J Obes 37, 568–575 (2013). https://doi.org/10.1038/ijo.2012.69

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