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Review
. 2017 Jan;13(1):25-40.
doi: 10.1038/nrrheum.2016.192. Epub 2016 Dec 1.

Causes and consequences of endoplasmic reticulum stress in rheumatic disease

Fatemeh Navid  1 , Robert A Colbert  1
Affiliations
Review

Causes and consequences of endoplasmic reticulum stress in rheumatic disease

Fatemeh Navid et al. Nat Rev Rheumatol. 2017 Jan.

Abstract

Rheumatic diseases represent a heterogeneous group of inflammatory conditions, many of which involve chronic activation of both innate and adaptive immune responses by multiple genetic and environmental factors. These immune responses involve the secretion of excessive amounts of cytokines and other signalling mediators by activated immune cells. The endoplasmic reticulum (ER) is the cellular organelle that directs the folding, processing and trafficking of membrane-bound and secreted proteins, including many key components of the immune response. Maintaining homeostasis in the ER is critical to cell function and survival. Consequently, elaborate mechanisms have evolved to sense and respond to ER stress through three main signalling pathways that together comprise the unfolded protein response (UPR). Activation of the UPR can rapidly resolve the accumulation of misfolded proteins, direct permanent changes in the size and function of cells during differentiation, and critically influence the immune response and inflammation. Recognition of the importance of ER stress and UPR signalling pathways in normal and dysregulated immune responses has greatly increased in the past few years. This Review discusses several settings in which ER stress contributes to the pathogenesis of rheumatic diseases and considers some of the therapeutic opportunities that these discoveries provide.

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