Modulation of Remimazolam Placental Transfer via OATP2B1 by Rosuvastatin in an In Vitro 3D Placental Barrier Model.
Sato Satoshi S, Chaki Tomohiro T, Narumi Katsuya K, Hirahata Tomoki T et al.
Fetal exposure to anesthetics via the placenta during the perinatal period may adversely affect central nervous system development. Organic anion-transporting polypeptide 2B1 (OATP2B1) functions as an active transport carrier across the blood-placental barrier and can be modulated by interactions with rosuvastatin (RSV). This study hypothesized that drug interactions could alter OATP2B1-mediated transport of remimazolam (RMZ), thereby modulating its placental permeability. First, an in vitro 3D blood-placental barrier model was used to assess the permeability of RMZ with a single administration (100 nM RMZ) and co-administration with RSV (0.1, 1, and 10 nM). RMZ permeability was significantly decreased from 2 to 4 hours in the RMZ alone group (p < 0.001), whereas at 3-4 hours post-dose it was significantly decreased by 15-71% in the groups treated with 1 nM or 10 nM RSV in combination, compared to the RMZ alone group. Next, intracellular uptake assays using OATP2B1-overexpressing human embryonic kidney 293 cells (HEK293) confirmed carrier-mediated transport of RMZ. Uptake was time-dependent, markedly higher than in non-expressing cells, and decreased by 57.6-61.1% in the presence of RSV. These findings demonstrate that RMZ is transported via OATP2B1 through a non-high-affinity binding site and that placental transfer of RMZ can be modulated by drug interactions that alter OATP2B1 function. Considering the differences in OATP2B1 localization between in vivo and in vitro conditions, modification of OATP2B1 transport function by RSV may potentially contribute to increased fetal exposure to RMZ at the blood-placental barrier.