Characterization of intestinal transporters in human ileal spheroid-derived differentiated cells for the prediction of intestinal drug absorption. (PubMed, Drug Metab Dispos)
Proximal jejunal and terminal ileal spheroid-derived differentiated cell monolayers showed H+- and Na+-coupled uptake of methotrexate and [3H]-taurocholic acid, respectively. The functional expression of CYP3A, CYP2C9, UGT1A, P-glycoprotein, and breast cancer resistance protein (BCRP) was confirmed based on the formation of metabolites (1'-hydroxy midazolam, 4'-hydroxy diclofenac, raloxifene-4'-glucuronide, and raloxifene-6-glucuronide) and the efflux ratio of typical substrates (digoxin, sulfasalazine, rosuvastatin, dantrolene, and furosemide). Terminal ileum-derived differentiated cell monolayers showed extensive taurocholic acid-d5 transport in the apical-to-basal direction, which was markedly inhibited by the ASBT inhibitor elobixibat...To date, there is no in vitro model that can reproduce regional differences in the transporter-mediated transport of nutrients and drugs in the intestine. This study successfully demonstrated that the functional expression of region-specific transporters, the proton-coupled folate transporter and the apical sodium-dependent bile acid transporter, was maintained in human proximal jejunal and terminal ileal spheroid-derived differentiated cell monolayers.