Abstract
Introduction:
Alkaline phosphatase is implicated in intestinal lipid transport and in the development of obesity. Placental alkaline phosphatase is localised to the microvillous plasma membrane of the placental syncytiotrophoblast at the maternal–fetal interface, but its role is unclear. We investigated the relations of placental alkaline phosphatase activity and mRNA expression with maternal body composition and offspring fat mass in humans.
Methods:
Term human placentas from the UK Birthright cohort (n = 52) and the Southampton Women’s Survey (SWS) (n = 95) were studied. In the Birthright cohort, alkaline phosphatase activity was measured in placental microvillous plasma membrane vesicles. In the SWS, alkaline phosphatase mRNA was measured using Nanostring. Alkaline phosphatase gene expression was compared to other lipid-related genes.
Results:
In Birthright samples placental microvillous plasma membrane alkaline phosphatase activity was positively associated with maternal triceps skinfold thickness and BMI (β = 0.04 (95% CI: 0.01–0.06) and β = 0.02 (0.00–0.03) µmol/mg protein/min per SD, P = 0.002 and P = 0.05, respectively) after adjusting for potential confounders. In SWS samples placental alkaline phosphatase mRNA expression in term placenta was positively associated with maternal triceps skinfold (β = 0.24 (0.04, 0.44) SD/SD, P = 0.02), had no association with neonatal %fat mass (β = 0.01 (−0.20 to 0.21) SD/SD, P = 0.93) and was negatively correlated with %fat mass at ages 4 (β = −0.28 (−0.52 to −0.04) SD/SD, P = 0.02), 6–7 (β = −0.25 (−0.49 to −0.02) SD/SD, P = 0.03) years. When compared with placental expression of other genes, alkaline phosphatase expression was positively related to genes including the lysophosphatidylcholine transporter MFSD2A (major facilitator superfamily domain containing 2A, P < 0.001) and negatively related to genes including the fatty acid transport proteins 2 and 3 (P = 0.001, P < 0.001).
Conclusions:
Our findings suggest relationships between placental alkaline phosphatase and both maternal and childhood adiposity. The inverse relationship between placental alkaline phosphatase gene expression and childhood %fat mass suggests that placental alkaline phosphatase may help to protect the foetus from the adverse effects of maternal obesity.
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Acknowledgements
The research leading to these results has received funding from the European Union’s Seventh Framework Programme (FP7/2007–2013), project EarlyNutrition under Grant agreement no. 289346. KMG is supported by the UK Medical Research Council (MC_UU_12011/4), the National Institute for Health Research (as an NIHR Senior Investigator [NF-SI-0515-10042] and through the NIHR Southampton Biomedical Research Centre) and the European Union’s Seventh Framework Programme (FP7/2007–2013), project ODIN under Grant agreement no. 613977.
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KMG has received reimbursement for speaking at conferences sponsored by companies selling nutritional products, and is part of an academic consortium that has received research funding from Abbott Nutrition, Nestec and Danone. The other authors declare no conflict of interest.
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Hirschmugl, B., Crozier, S., Matthews, N. et al. Relation of placental alkaline phosphatase expression in human term placenta with maternal and offspring fat mass. Int J Obes 42, 1202–1210 (2018). https://doi.org/10.1038/s41366-018-0136-8
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DOI: https://doi.org/10.1038/s41366-018-0136-8