Abstract
Purpose
Fexofenadine is a well-identified in vivo probe substrate of P-glycoprotein (P-gp) and/or organic anion transporting polypeptide (OATP). This work aimed to investigate the transplacental pharmacokinetics of fexofenadine enantiomers with and without the selective P-gp inhibitor fluoxetine.
Methods
The chiral transplacental pharmacokinetics of fexofenadine-fluoxetine interaction was determined using the ex vivo human placenta perfusion model (n = 4). In the Control period, racemic fexofenadine (75 ng of each enantiomer/ml) was added in the maternal circuit. In the Interaction period, racemic fluoxetine (50 ng of each enantiomer/mL) and racemic fexofenadine (75 ng of each enantiomer/mL) were added to the maternal circulation. In both periods, maternal and fetal perfusate samples were taken over 90 min.
Results
The (S)-(−)- and (R)-(+)-fexofenadine fetal-to-maternal ratio values in Control and Interaction periods were similar (~0.18). The placental transfer rates were similar between (S)-(−)- and (R)-(+)-fexofenadine in both Control (0.0024 vs 0.0019 min−1) and Interaction (0.0019 vs 0.0021 min−1) periods. In both Control and Interaction periods, the enantiomeric fexofenadine ratios [R-(+)/S-(−)] were approximately 1.
Conclusions
Our study showed a low extent, slow rate of non-enantioselective placental transfer of fexofenadine enantiomers, indicating a limited fetal fexofenadine exposure mediated by placental P-gp and/or OATP2B1. The fluoxetine interaction did not affect the non-enantioselective transplacental transfer of fexofenadine. The ex vivo placental perfusion model accurately predicts in vivo placental transfer of fexofenadine enantiomers with remarkably similar values (~0.17), and thus estimates the limited fetal exposure.
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Data Availability
The data sets obtained and/or analyzed during the current study are available from the corresponding author on reasonable request.
Abbreviations
- OATP:
-
Organic anion transporting polypeptide
- P-gp:
-
P-glycoprotein
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Financial Support
This study was supported by Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES; BEX6119/13–1).
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Pinto, L., Bapat, P., de Lima Moreira, F. et al. Chiral Transplacental Pharmacokinetics of Fexofenadine: Impact of P-Glycoprotein Inhibitor Fluoxetine Using the Human Placental Perfusion Model. Pharm Res 38, 647–655 (2021). https://doi.org/10.1007/s11095-021-03035-7
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DOI: https://doi.org/10.1007/s11095-021-03035-7