title: Oxidative stress is a triggering factor for LPS-induced Mrp2 internalization in the cryopreserved rat and human liver slices.
abstract: Cholestasis develops during inflammation and is characterized as occurring under oxidative stress. We have described the internalization of multidrug resistance-associated protein 2 (Mrp2), a biliary transporter involved in bile-salt-independent bile flow, under ethacrynic acid or lipopolysaccharide (LPS)-induced acute oxidative stress in rat liver. However, it remains unclear whether canalicular Mrp2 internalization is observed in human liver under conditions of acute oxidative stress. In this study, we examined the effect of dimerumic acid (DMA), an antioxidant and found in traditional Chinese medicine, on endotoxin-induced Mrp2 internalization in rat and human liver slices. At 1.5h following LPS treatment (100microg/mL), canalicular Mrp2 localization was disrupted without changing the expression of Mrp2 protein or the integrity of filamentous actin in the rat and human liver slices. Pretreatment with DMA (10microM) counteracted LPS-induced subcellular distribution of Mrp2. Our data clearly indicated that LPS-induced short-term rapid retrieval of Mrp2 from the canalicular surface resulted from LPS-induced oxidative stress in rat and human liver slices.
authors.affiliation: Laboratory of Biopharmaceutics, Graduate School of Pharmaceutical Sciences, Chiba University, Chiba, Japan.
authors.forename: Shuichi
authors.initials: S
authors.lastname: Sekine
authors.forename: Kentaro
authors.initials: K
authors.lastname: Yano
authors.forename: Junjiro
authors.initials: J
authors.lastname: Saeki
authors.forename: Nozomi
authors.initials: N
authors.lastname: Hashimoto
authors.forename: Toru
authors.initials: T
authors.lastname: Fuwa
authors.forename: Toshiharu
authors.initials: T
authors.lastname: Horie
mesh_terms: D000818:Animals; D000975:Antioxidants / Q000737:chemistry / Q000494:pharmacology*; D002779:Cholestasis / Q000378:metabolism*; D015925:Cryopreservation; D054659:Diketopiperazines / Q000737:chemistry / Q000494:pharmacology*; D005978:Glutathione / Q000378:metabolism; D006801:Humans; D006877:Hydroxamic Acids / Q000737:chemistry / Q000494:pharmacology*; D008070:Lipopolysaccharides; D008099:Liver / Q000187:drug effects* / Q000378:metabolism; D000089762:Multidrug Resistance-Associated Protein 2; D027425:ATP-Binding Cassette, Sub-Family C Proteins / Q000378:metabolism*; D018384:Oxidative Stress; D051381:Rats
chemical_list: D000975:Antioxidants; D054659:Diketopiperazines; D005978:Glutathione; D006877:Hydroxamic Acids; D008070:Lipopolysaccharides; D000089762:Multidrug Resistance-Associated Protein 2; D027425:ATP-Binding Cassette, Sub-Family C Proteins; C000715087:ABCC2 protein, human; C552122:dimerumic acid