title: Interaction of valproic acid and carbapenem antibiotics with multidrug resistance-associated proteins in rat erythrocyte membranes.
abstract: We recently reported that the decrease in plasma valproic acid (VPA) level by carbapenem antibiotics (CPs) may partly be due to the increased erythrocyte distribution of VPA. In order to clarify the mechanisms underlying altered VPA distribution in erythrocytes, we examined the role of multidrug resistance-associated proteins (Mrps). The uptake of 2,4-dinitrophenyl-S-glutathione (DNP-SG), a substrate of Mrps, by inside-out vesicles (IOVs) prepared from rat erythrocytes was an ATP-dependent, active process. DNP-SG uptake was mediated by high- and low-affinity transport systems, and was inhibited by various Mrp inhibitors such as probenecid and indomethacin. Glutathione stimulated only the high-affinity transport system. VPA inhibited the low-affinity transport of DNP-SG, while panipenem, a CP, inhibited both high- and low-affinity transport. ATP-dependent, Mrp-mediated transport of methotrexate, another Mrp substrate, in IOVs was also observed, and VPA and various CPs inhibited the transport. The uptake of [(3)H]VPA was examined, and found to be ATP-dependent. ATP-dependent uptake of [(3)H]VPA was inhibited by Mrp inhibitors and panipenem, while the inhibition was not observed in the absence of ATP. These results indicate that VPA and CPs interact with Mrp-mediated transport in erythrocyte membranes, and VPA itself is transported by Mrps, which is inhibited by panipenem. Thus, the increased erythrocyte distribution of VPA by CPs observed under in vivo conditions may partly be explained by their interaction with Mrps in erythrocyte membranes.
authors.affiliation: Department of Pharmaceutics and Therapeutics, Graduate School of Biomedical Sciences, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8553, Japan.
authors.forename: Kumiko
authors.initials: K
authors.lastname: Ogawa
authors.forename: Ryoko
authors.initials: R
authors.lastname: Yumoto
authors.forename: Natsuki
authors.initials: N
authors.lastname: Hamada
authors.forename: Junya
authors.initials: J
authors.lastname: Nagai
authors.forename: Mikihisa
authors.initials: M
authors.lastname: Takano
mesh_terms: D000255:Adenosine Triphosphate / Q000378:metabolism; D000818:Animals; D000900:Anti-Bacterial Agents / Q000009:adverse effects*; D015780:Carbapenems / Q000009:adverse effects*; D004305:Dose-Response Relationship, Drug; D004347:Drug Interactions; D004910:Erythrocyte Membrane / Q000378:metabolism*; D005978:Glutathione / Q000031:analogs & derivatives* / Q000037:antagonists & inhibitors / Q000378:metabolism / Q000493:pharmacokinetics / Q000494:pharmacology; D007213:Indomethacin / Q000494:pharmacology; D008727:Methotrexate / Q000378:metabolism / Q000493:pharmacokinetics; D027425:ATP-Binding Cassette, Sub-Family C Proteins / Q000037:antagonists & inhibitors / Q000378:metabolism*; D011339:Probenecid / Q000494:pharmacology; D051381:Rats; D022161:Transport Vesicles / Q000378:metabolism; D014635:Valproic Acid / Q000097:blood / Q000493:pharmacokinetics*
chemical_list: D000255:Adenosine Triphosphate; D000900:Anti-Bacterial Agents; D015780:Carbapenems; D005978:Glutathione; D007213:Indomethacin; D008727:Methotrexate; D027425:ATP-Binding Cassette, Sub-Family C Proteins; D011339:Probenecid; D014635:Valproic Acid; C030190:S-(2,4-dinitrophenyl)glutathione