Endoplasmic reticulum stress in liver diseases

Amir Ajoolabady, Neil Kaplowitz, Cynthia Lebeaupin, Guido Kroemer, Randal J. Kaufman, Harmeet Malhi, Jun Ren

    Research output: Contribution to journalReview articlepeer-review

    92 Citations (Scopus)

    Abstract

    The endoplasmic reticulum (ER) is an intracellular organelle that fosters the correct folding of linear polypeptides and proteins, a process tightly governed by the ER-resident enzymes and chaperones. Failure to shape the proper 3-dimensional architecture of proteins culminates in the accumulation of misfolded or unfolded proteins within the ER, disturbs ER homeostasis, and leads to canonically defined ER stress. Recent studies have elucidated that cellular perturbations, such as lipotoxicity, can also lead to ER stress. In response to ER stress, the unfolded protein response (UPR) is activated to reestablish ER homeostasis ("adaptive UPR"), or, conversely, to provoke cell death when ER stress is overwhelmed and sustained ("maladaptive UPR"). It is well documented that ER stress contributes to the onset and progression of multiple hepatic pathologies including NAFLD, alcohol-associated liver disease, viral hepatitis, liver ischemia, drug toxicity, and liver cancers. Here, we review key studies dealing with the emerging role of ER stress and the UPR in the pathophysiology of liver diseases from cellular, murine, and human models. Specifically, we will summarize current available knowledge on pharmacological and non-pharmacological interventions that may be used to target maladaptive UPR for the treatment of nonmalignant liver diseases.

    Original languageEnglish
    Pages (from-to)619-639
    Number of pages21
    JournalHepatology
    Volume77
    Issue number2
    DOIs
    Publication statusPublished - 1 Feb 2023

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