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Phospholipid Alterations in Hepatocyte Membranes and Transporter Protein Changes in Cholestatic Rat Model

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Abstract

Biliary components are transported by hepatic adenosine triphosphate-binding cassette (ABC) transporters that are located in canalicular membranes. Physiological transporter function is related to membrane fluidity, which is modulated by the phospholipid composition of the lipid bilayer. We hypothesized that cholestasis may alter transporter function by modifying phospholipid species to protect the cell from cholestatic damage. Therefore, we examined the expression of ABC transport proteins and their mRNA levels in canalicular membrane vesicles isolated from rat liver 6 hr or three days after bile duct ligation. Membrane lipid composition and membrane fluidity of both sinusoidal and canalicular membrane vesicles were also examined. By 6 hr after bile duct ligation, we found a clear increase of mdr2 and bsep mRNA. These changes were associated with an increase of mdr-Pgp and with a clear decrease of mrp2 protein, and small decrease of bsep protein. In addition, mdr1b mRNA showed a strong increase by three days after bile duct ligation. Canalicular membrane fluidity decreased in a marked time-dependent manner, whereas sinusoidal membranes showed biphasic changes: increased fluidity at 6 hr and a decrease at three days. These changes were closely related to the changes of membrane lipid constitution; the saturated/unsaturated fatty acid ratio increased for phosphatidylcholine in canalicular membrane and the reverse occurred in sinusoidal membrane, and those for sphingomyelin showed the opposite pattern. We conclude that cholestasis causes modulation of ABC transporters as well as that of the lipid constitution in lipid bilayer. These may confer cytoprotective resistance to hepatocytes against cholestatic stress.

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Authors and Affiliations

  1. First Department of Internal Medicine, Hiroshima University School of Medicine, Hiroshima, Japan

    Hideyuki Hyogo, Susumu Tazuma, Tomoji Nishioka, Hidenori Ochi, Atushi Yamaguchi, Yoshihiro Numata, Keishi Kanno, Minoru Sakomoto, Yasumasa Asamoto, Kazuhiko Tsuboi, Kuniharu Nakai, Shigeyuki Yasumiba, Yasushi Sunami & Goro Kajiyama

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  1. Hideyuki Hyogo
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  2. Susumu Tazuma
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  3. Tomoji Nishioka
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  4. Hidenori Ochi
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Hyogo, H., Tazuma, S., Nishioka, T. et al. Phospholipid Alterations in Hepatocyte Membranes and Transporter Protein Changes in Cholestatic Rat Model. Dig Dis Sci 46, 2089–2097 (2001). https://doi.org/10.1023/A:1011934108920

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