Endoplasmic Reticulum Stress Increases Multidrug-resistance Protein 2 Expression and Mitigates Acute Liver Injury

Author(s): Wen-Ge Huang, Jun Wang, Yu-Juan Liu, Hong-Xia Wang, Si-Zhen Zhou, Huan Chen, Fang-Wan Yang, Ying Li, Yu Yi, Yi-Huai He*.

Journal Name: Current Molecular Medicine

Volume 20 , Issue 7 , 2020

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Abstract:

Background: Multidrug-resistance protein (MRP) 2 is a key membrane transporter that is expressed on hepatocytes and regulated by nuclear factor kappa B (NF-κB). Interestingly, endoplasmic reticulum (ER) stress is closely associated with liver injury and the activation of NF-κB signaling.

Objective: Here, we investigated the impact of ER stress on MRP2 expression and the functional involvement of MRP2 in acute liver injury.

Methods: ER stress, MRP2 expression, and hepatocyte injury were analyzed in a carbon tetrachloride (CCl4)-induced mouse model of acute liver injury and in a thapsigargin (TG)-induced model of ER stress.

Results: CCl4 and TG induced significant ER stress, MRP2 protein expression and NF- κB activation in mice and LO2 cells (P < 0.05). Pretreatment with ER stress inhibitor 4- phenyl butyric acid (PBA) significantly mitigated CCl4 and TG-induced ER stress and MRP2 protein expression (P < 0.05). Moreover, pretreatment with pyrrolidine dithiocarbamic acid (PDTC; NF-κB inhibitor) significantly inhibited CCl4-induced NF-κB activation and reduced MRP2 protein expression (1±0.097 vs. 0.623±0.054; P < 0.05). Furthermore, hepatic downregulation of MRP2 expression significantly increased CCl4- induced ER stress, apoptosis, and liver injury.

Conclusion: ER stress enhances intrahepatic MRP2 protein expression by activating NF-κB. This increase in MRP2 expression mitigates ER stress and acute liver injury.

Keywords: Multidrug-resistance protein 2, endoplasmic reticulum stress, apoptosis, necroptosis, nuclear factor kappa B, acute liver injury.

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Article Details

VOLUME: 20
ISSUE: 7
Year: 2020
Page: [548 - 557]
Pages: 10
DOI: 10.2174/1566524020666200124102411
Price: $95

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