title: Stomach- and site-selective delivery of 5-fluorouracil following its application on the gastric serosal surface in rats.
abstract: The present study was undertaken to elucidate the stomach- and site-selective delivery of 5-fluorouracil (5-FU) following its application on the gastric serosal surface in rats. An experimental system utilizing a cylindrical diffusion cell attached to the gastric serosal surface was established. To evaluate the gastric distribution of 5-FU, the stomach was separated into the site under the diffusion cell (site 1) and the site not under the diffusion cell (site 2). Furthermore, the mucosal side at site 1 was separated from the serosal side. After intravenous and oral administration of 5-FU, the 5-FU concentrations at sites 1 and 2 until 240 min were similar. After gastric serosal surface application of 5-FU, however, the concentration of 5-FU at site 1 until 240 min was approximately 10-fold higher than that at site 2, and was sustained. Furthermore, the 5-FU concentration on the mucosal side at site 1 and the serosal side at site 1 were comparable after gastric serosal surface application. The blood concentration of 5-FU was low (<4.4 microg/ml) until 240 min after gastric serosal surface application. The maximum blood concentration of 5-FU after gastric serosal surface application was significantly lower than after intravenous administration. Thus, the stomach- and site-selective delivery system following application on the gastric serosal surface could be applied with anticancer drugs for the treatment of gastric cancer.
authors.affiliation: Graduate School of Biomedical Sciences, Nagasaki University, Japan.
authors.forename: Junzo
authors.initials: J
authors.lastname: Nakamura
authors.forename: Kazuko
authors.initials: K
authors.lastname: Kobayashi
authors.forename: Shintaro
authors.initials: S
authors.lastname: Fumoto
authors.forename: Junya
authors.initials: J
authors.lastname: Nishi
authors.forename: Takahiro
authors.initials: T
authors.lastname: Mukai
authors.forename: Mikiro
authors.initials: M
authors.lastname: Nakashima
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Sasaki
authors.forename: Koyo
authors.initials: K
authors.lastname: Nishida
mesh_terms: D000818:Animals; D016503:Drug Delivery Systems / Q000379:methods*; D005472:Fluorouracil / Q000008:administration & dosage* / Q000378:metabolism; D005753:Gastric Mucosa / Q000187:drug effects* / Q000378:metabolism; D008297:Male; D051381:Rats; D017208:Rats, Wistar; D013270:Stomach / Q000187:drug effects*
chemical_list: D005472:Fluorouracil