2024-03-29T13:24:46Zhttps://eprints.lib.hokudai.ac.jp/dspace-oai/requestoai:eprints.lib.hokudai.ac.jp:2115/576552022-11-17T02:08:08Zhdl_2115_20044hdl_2115_124Intestinal P-glycoprotein Expression is Multimodally Regulated by Intestinal Ischemia-ReperfusionTerada, YusukeOgura, JiroTsujimoto, TakashiKuwayama, KaoriKoizumi, TakahiroSasaki, ShunichiMaruyama, HajimeKobayashi, MasakiYamaguchi, HiroakiIseki, Ken499Purpose. Reactive oxygen species (ROS) have multiple physiological effects that are amount-dependent. ROS are one of the causes of intestinal ischemia-reperfusion (I/R) injury. In this study, we investigated whether the amount of ROS and the degree of intestinal I/R injury affect the expression level of P-glycoprotein (P-gp). Methods. We used hydrogen peroxide (H2O2) as ROS in in vitro experiments. Intestinal I/R model rats, which were subjected 15-min ischemia (I/R-15), were used in in vivo experiments. Results. P-gp expression in Caco-2 cells was increased in response to 1 mu M of H2O2 but decreased upon exposure to 10 mM of H2O2. We previously reported that P-gp expression is decreased after intestinal I/R with 30-min ischemia (I/R-30), which time a large amount of ROS is generated. I/R-15 induced slightly less mucosal and oxidative injury than did I/R-30. P-gp expression in the jejunum was increased at 1 h after I/R-15, and ileal paracellular permeability was increased. The blood concentration of tacrolimus, a P-gp substrate, was lower during 0-20 min but was higher during 40-90 min post-administration compared with that in the sham-operated rats. P-gp expression in the ileum was decreased at 6 h after I/R-15, due to abnormal localization of P-gp, resulting in a high blood tacrolimus concentration in rats reperfused for 6 h. Conclusions. ROS multimodally regulate P-gp expression depending on its amount. This is important for understanding the pattern of P-gp expression after intestinal I/R.Canadian Society for Pharmaceutical SciencesJournal Articleapplication/pdfhttp://hdl.handle.net/2115/57655https://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/57655/1/WoS_67845_Ogura.pdf1482-1826Journal of pharmacy and pharmaceutical sciences1722662762014enginfo:pmid/24934555http://creativecommons.org/licenses/by-sa/4.0/publisher