Abstract
Available data on human brain P-glycoprotein ontogeny during infancy and childhood are limited. This review discusses the current body of data relating to maturation of human brain P-glycoprotein including transporter expression levels in post-mortem human brain samples, in vivo transporter activity using probe substrates, surrogate marker endpoints, and extrapolations from animal models. Overall, the data tend to confirm that human brain P-glycoprotein activity keeps developing after birth, although with a developmental time frame that remains unclear. This knowledge gap is a concern given the critical role of brain P-glycoprotein in drug safety and efficacy, and the vulnerable nature of the pediatric population. Future research could include the measurement of brain P-glycoprotein activity across age groups using positron emission tomography or central pharmacodynamic responses. For now, caution is advised when extrapolating adult data to children aged younger than 2 years for drugs with P-glycoprotein-dependent central nervous system activity.
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Acknowledgments
The authors would like to acknowledge Laura Griffin, PhD, of iMed Comms, Macclesfield, UK, an Ashfield Company, part of UDG Healthcare plc for editing assistance that was funded by UCB Pharma in accordance with Good Publications Practice (GPP3) guidelines (http://www.ismpp.org/gpp3).
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Nicolas, JM., de Lange, E.C.M. Mind the Gaps: Ontogeny of Human Brain P-gp and Its Impact on Drug Toxicity. AAPS J 21, 67 (2019). https://doi.org/10.1208/s12248-019-0340-z
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DOI: https://doi.org/10.1208/s12248-019-0340-z