Abstract
Introduction
Maternal obesity is associated with a range of pregnancy complications, including fetal growth restriction (FGR), whereby a fetus fails to reach its genetically determined growth. Placental insufficiency and reduced nutrient transport play a role in the onset of FGR.
Objectives
Metabolomic profiling was used to reveal altered maternal and fetal metabolic pathways in a model of diet induced obesity during pregnancy, leading to reduced fetal growth.
Methods
We examined the metabolome of maternal and fetal livers, and placenta following a high fat and salt intake. Sprague–Dawley rats were assigned to (a) control diet (CD; 1 % salt, 10 % kcal from fat), (b) high salt diet (SD; 4 % salt, 10 % kcal from fat), (c) high fat diet (HF; 1 % salt, 45 % kcal from fat) or (d) high-fat high-salt diet (HFSD; 4 % salt, 45 % kcal from fat) 21 days prior to pregnancy and during gestation. Metabolites from maternal and fetal livers, and placenta were identified using gas and liquid chromatography combined with mass spectrometry.
Results
Maternal HF intake resulted in reduced fetal weight. Altered metabolite profiles were observed in the HF maternal and fetal liver, and placenta. Polyunsaturated fatty acid metabolism was significantly altered in maternal and fetal liver by maternal fat intake.
Conclusion
Excess of linoleic and α-linoleic acid (essential fatty acids) may be detrimental during placentation and associated with a reduction in fetal weight. Additionally, maternal, placental and fetal response to increased fat consumption seems likely to involve palmitoleic acid utilization as an adaptive response during maternal obesity.
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Acknowledgments
The authors would like to express their gratitude for support provided by the Vernon Jansen Unit and the Centre for Genomics, Proteomics and Metabolomics. Technical assistance was provided by Rachna Patel, Angelica Bernal, Minglan Li, Elizabeth McKenzie and Margaret Coe. Financial assistance was provided by Gravida: National Centre for Growth and Development (Project no. STF-13-24), Lotteries Health Research Fellowship, Faculty Development Research Funding (FDRF) and the Nutricia Research Foundation.
Author contributions
KS, PNB, CG and MHV designed research; KM and CJH conducted the research with support from KR in the biostatistical analysis; KS, CG and KM wrote manuscript; MHV, PNB, JLS, CMR, KR and SGV-B critically evaluated the manuscript.
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KM, CG, CMR, MHV, CJH, JLS, KR, SGV-B, PNB, KS declare that they have no conflict of interest.
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All procedures performed in studies involving animals were in accordance with the ethical standards of the institution or practice at which the studies were conducted. Animal procedures were approved by the Animal Ethics Committee of the University of Auckland (approval R1069). This article does not contain any studies with human participants performed by any of the authors.
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Karen Mumme and Clint Gray have contributed equally.
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Mumme, K., Gray, C., Reynolds, C.M. et al. Maternal-fetal hepatic and placental metabolome profiles are associated with reduced fetal growth in a rat model of maternal obesity. Metabolomics 12, 83 (2016). https://doi.org/10.1007/s11306-016-1014-9
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DOI: https://doi.org/10.1007/s11306-016-1014-9