Abstract
Scaffold proteins such as radixin help to modulate the plasma membrane localization and transport activity of the multidrug resistance-associated protein 2 (MRP2/ABCC2) and P-glycoprotein (P-gp/ABCB1) efflux transporters in the liver. We examined changes in radixin expression and interaction with efflux transporters in adjuvant-induced arthritic (AA) rats, an animal model of rheumatoid arthritis, as well as in human liver cancer (HepG2) cells because inflammation affects drug pharmacokinetics via the efflux transporters. The expression levels of radixin and phosphorylated radixin (p-radixin) were measured 24 h after treatment with inflammatory cytokines comprising tumor necrosis factor (TNF)-α, interleukin (IL)-1β, IL-6 or sodium nitroprusside (SNP; a nitric oxide donor). The protein levels of radixin, MRP2, and P-gp in the rat liver were next examined. We also investigated whether inflammation affected the formation of complexes between radixin and MRP2 or P-gp. The mRNA and protein levels of radixin in HepG2 cells were significantly decreased by TNF-α treatment, while minimal changes were observed after treatment with IL-1β, IL-6 or SNP. TNF-α also significantly decreased the protein levels of p-radixin, suggesting that TNF-α inhibited the activation of radixin and thereby reduced the activity of the efflux transporters. Complex formation of radixin with MRP2 and P-gp was significantly decreased in AA rats but this was reversed by prednisolone and dexamethasone treatment, indicating that decreased interactions of radixin with MRP2 and P-gp likely occur during liver inflammation. These data suggest that liver inflammation reduces radixin function by decreasing its interactions with MRP2 and P-gp.
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This work was supported by Japan Society for the Promotion of Science Grant-in Aid for Scientific Research (C) Grant Number 18 K06806, the Japanese Ministry of Education, Culture, Sports Science, and Technology.
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were Atsushi Kawase, Misaki Nakasaka, Hatsune Bando and Saori Yasuda. The first draft of the manuscript was written by Atsushi Kawase and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Kawase, A., Nakasaka, M., Bando, H. et al. Changes in Radixin Expression and Interaction with Efflux Transporters in the Liver of Adjuvant-Induced Arthritic Rats. Inflammation 43, 85–94 (2020). https://doi.org/10.1007/s10753-019-01097-9
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DOI: https://doi.org/10.1007/s10753-019-01097-9