title: Kinetic study of anti-viral ribavirin uptake mediated by hCNT3 and hENT1 in Xenopus laevis oocytes.
abstract: Transport across the cell membrane is crucial in drug delivery. However, the process is complicated because nucleoside derivatives that are commonly used as anti-viral drugs are transported through two different types of specific transporters: concentrative transporters and equilibrative transporters. Cross-disciplinary approaches involving both biological experiments and theoretical considerations are therefore necessary to study the transport of nucleoside analogues such as ribavirin. Here we constructed an experimental model system using the Xenopus laevis oocyte that expressed examples of both types of transporters: human concentrative nucleoside transporter 3 and human equilibrative transporter 1. We also performed a kinetic study. Experimental results showed that the transport of ribavirin could be reduced by inhibiting one of the two types of transporters, which seems to be counterintuitive. We therefore designed a simple mathematical model of the dynamics of ribavirin uptake and analyzed the model behaviors using a numerical simulation. The theoretical results reproduced the experimentally observed phenomena and suggested a possible mechanism for the process. Based on this mechanism, we predicted some potential methods for the effective uptake of ribavirin from a dynamics point of view.
authors.affiliation: Graduate School for Pharmaceutical Science, Hokkaido University, Sapporo, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Yamamoto
authors.forename: Mitsuru
authors.initials: M
authors.lastname: Sugawara
authors.forename: Takashi
authors.initials: T
authors.lastname: Kikukawa
authors.forename: Seiji
authors.initials: S
authors.lastname: Miyauchi
authors.forename: Masahiro
authors.initials: M
authors.lastname: Yamaguchi
authors.forename: Atsushi
authors.initials: A
authors.lastname: Tero
authors.forename: Seiji
authors.initials: S
authors.lastname: Takagi
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Nakagaki
mesh_terms: D000818:Animals; D033721:Equilibrative Nucleoside Transporter 1 / Q000378:metabolism*; D007700:Kinetics; D008954:Models, Biological; D033703:Nucleoside Transport Proteins / Q000378:metabolism*; D009865:Oocytes / Q000187:drug effects / Q000378:metabolism*; D012254:Ribavirin / Q000378:metabolism*; D012965:Sodium Chloride / Q000494:pharmacology; D013868:Thioinosine / Q000031:analogs & derivatives / Q000494:pharmacology; D014982:Xenopus laevis
chemical_list: D033721:Equilibrative Nucleoside Transporter 1; D033703:Nucleoside Transport Proteins; C438649:SLC29A1 protein, human; C501424:SLC29A3 protein, human; D012965:Sodium Chloride; D013868:Thioinosine; D012254:Ribavirin; C001789:4-nitrobenzylthioinosine