Abstract
At present, it has not been systematically evaluated whether the functional alterations induced by cholestatic compounds in canalicular transporters involved in bile formation can be reproduced in sandwich-cultured rat hepatocytes (SCRHs). Here, we focused on two clinically relevant cholestatic agents, such as estradiol 17β-d-glucuronide (E17G) and taurolithocholate (TLC), also testing the ability of dibutyryl cyclic AMP (DBcAMP) to prevent their effects. SCRHs were incubated with E17G (200 µM) or TLC (2.5 µM) for 30 min, with or without pre-incubation with DBcAMP (10 µM) for 15 min. Then, the increase in glutathione methyl fluorescein (GS-MF)-associated fluorescence inside the canaliculi was monitored by quantitative time-lapse imaging, and Mrp2 transport activity was calculated by measuring the slope of the time-course fluorescence curves during the initial linear phase, which was considered to be the Mrp2-mediated initial transport rate (ITR). E17G and TLC impaired canalicular bile formation, as evidenced by a decrease in both the bile canaliculus volume and the bile canaliculus width, estimated from 3D and 2D confocal images, respectively. These compounds decreased ITR and induced retrieval of Mrp2, a main pathomechanism involved in their cholestatic effects. Finally, DBcAMP prevented these effects, and its well-known choleretic effect was evident from the increase in the canalicular volume/width values; this choleretic effect is associated in part with its capability to increase Mrp2 activity, evidenced here by the increase in ITR of GS-MF. Our study supports the use of SCRHs as an in vitro model useful to quantify canalicular transport function under conditions of cholestasis and choleresis.
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Acknowledgments
This work was supported by Grants from the Agencia Nacional de Promoción Científica y Tecnológica (ANPCyT, PICT 2010 No. 0995) and Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET, PIP No. 00691). The authors wish to thank J. Elena Ochoa, M. D., and Mr. Diego Taborda for technical assistance in isolation of hepatocytes, and Dr. María Cecilia Larocca for expert advice in confocal image analysis.
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Miszczuk, G.S., Barosso, I.R., Zucchetti, A.E. et al. Sandwich-cultured rat hepatocytes as an in vitro model to study canalicular transport alterations in cholestasis. Arch Toxicol 89, 979–990 (2015). https://doi.org/10.1007/s00204-014-1283-x
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DOI: https://doi.org/10.1007/s00204-014-1283-x