Placental transporter localization and expression in the Human: the importance of species, sex, and gestational age differences

Natasha Walker* (Corresponding Author), Panagiotis Filis, Ugo Soffientini, Michelle Bellingham, Peter J O'Shaughnessy, Paul A Fowler

*Corresponding author for this work

Research output: Contribution to journalLiterature reviewpeer-review

88 Citations (Scopus)
11 Downloads (Pure)


The placenta is a critical organ during pregnancy, essential for the provision of an optimal intrauterine environment, with fetal survival, growth and development relying on correct placental function. It must allow nutritional compounds and relevant hormones to pass into the fetal bloodstream and metabolic waste products to be cleared. It also acts as a semi-permeable barrier to potentially harmful chemicals both endogenous and exogenous. Transporter proteins allow for bidirectional transport and are found in the syncytiotrophoblast of the placenta and endothelium of fetal capillaries. The major transporter families in the human placenta are ABC and SLC and insufficiency of these transporters may lead to deleterious effects on the fetus. Transporter expression levels are gestation-dependent and this is of considerable clinical interest as levels of drug resistance may be altered from one trimester to the next. This highlights the importance of these transporters in mediating correct and timely transplacental passage of essential compounds but also for efflux of potentially toxic drugs and xenobiotics. We review the current literature on placental molecular transporters with respect to their localization and ontogeny, the influence of fetal sex and the relevance of animal models. We conclude that a paucity of information exists and further studies are required to unlock the enigma of this dynamic organ.
Original languageEnglish
Pages (from-to)733-742
Number of pages10
JournalBiology of Reproduction
Issue number4
Early online date7 Mar 2017
Publication statusPublished - Apr 2017

Bibliographical note

Grant Support: This work was supported by the Medical Research Council, UK (MR/L010011/1 to PAF, PJOS) and a Glasgow Children's Hospital Charity Research Fund and University of Aberdeen, UK, Elphinstone Scholarship to NW.


  • placenta
  • placental transport
  • human
  • ontogeny


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