Placental Drug Transport‐on‐a‐Chip: A Microengineered In Vitro Model of Transporter‐Mediated Drug Efflux in the Human Placental Barrier

The current lack of knowledge about the effect of maternally administered drugs on the developing fetus is a major public health concern worldwide. The first critical step toward predicting the safety of medications in pregnancy is to screen drug compounds for their ability to cross the placenta. However, this type of preclinical study has been hampered by the limited capacity of existing in vitro and ex vivo models to mimic physiological drug transport across the maternal–fetal interface in the human placenta. Here the proof‐of‐principle for utilizing a microengineered model of the human placental barrier to simulate and investigate drug transfer from the maternal to the fetal circulation is demonstrated. Using the gestational diabetes drug glyburide as a model compound, it is shown that the microphysiological system is capable of reconstituting efflux transporter‐mediated active transport function of the human placental barrier to limit fetal exposure to maternally administered drugs. The data provide evidence that the placenta‐on‐a‐chip may serve as a new screening platform to enable more accurate prediction of drug transport in the human placenta. This paper presents a microengineered model of the human placental barrierfor investigation of maternal–fetal drug transfer in pregnancy. The placenta‐on‐a‐chip system reconstitutes efflux transporter‐mediated transport of a test compound, demonstrating proof‐of‐principle for use as a screening platform for prediction of drug transport in pregnancy.