Abstract
Endoplasmic reticulum (ER) stress is a key factor contributing to fibrotic disease. Although ER stress is a short-term adaptive response, with chronic stimulation, it can activate pathways leading to fibrosis. ER stress can induce TGF-β signaling, a central driver of extracellular matrix production in fibrosis. This review will discuss the role of an ER protein, calreticulin (CRT), which has both chaperone and calcium regulatory functions, in fibrosis. CRT expression is upregulated in multiple different fibrotic diseases. The roles of CRT in regulation of fibronectin extracellular matrix assembly, extracellular matrix transcription, and collagen secretion and processing into the extracellular matrix will be discussed. Evidence for the importance of CRT in ER calcium release and NFAT activation downstream of TGF-β signaling will be presented. Finally, we will summarize evidence from animal models in which CRT expression is genetically reduced or experimentally downregulated in targeted tissues of adult animals and discuss how these models define a key role for CRT in fibrotic diseases.
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Abbreviations
- ATF4:
-
Activating transcription factor 4
- ATF6:
-
Activating transcription factor 6
- CHOP:
-
C/EBP homologous protein
- CRT:
-
Calreticulin
- ECM:
-
Extracellular matrix
- EMT:
-
Epithelial to mesenchymal transition
- ER:
-
Endoplasmic reticulum
- ERp57:
-
Endoplasmic reticulum protein of 57 kDa
- GADD34:
-
Growth arrest and DNA damage-inducible 34
- GRP78:
-
Glucose regulated protein 78 kD
- HSP47:
-
Heat shock protein 47 kD
- IRE1:
-
Inositol-requiring protein 1
- JNK:
-
c-jun N-terminal kinase
- LRP1:
-
Low-density lipoprotein receptor-related protein 1
- MAPK:
-
Mitogen-activated protein kinase
- MDCK:
-
Madin-Darby canine kidney
- MEFs:
-
Mouse embryonic fibroblasts
- MEKK1:
-
Mitogen-activated protein kinase kinase kinase 1
- NFAT:
-
Nuclear factor of activated T cells
- ORP150:
-
150-kDa oxygen-regulated protein
- 4-PBA:
-
4-phenylbutyrate
- PERK:
-
Protein kinase RNA (PKR)-like ER kinase
- PI3K:
-
Phosphoinositide-3 kinase
- Smad 2/3:
-
Mothers against decapentaplegic homologs 2/3
- TGF-β:
-
Transforming growth factor beta
- TSP-1:
-
Thrombospondin 1
- TUDCA:
-
Tauroursodeoxycholic acid
- UPR:
-
Unfolded protein response
- UUO:
-
Unilateral ureteric obstruction
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Acknowledgements
Original research presented in this review was supported by grants from the American Heart Association (12IRG9160008) and from the Department of Defense (W81XWH-14-1-0203) to JEMU and by NIH T32 HL007918 and T32 AI007051 to KAZ.
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Owusu, B.Y., Zimmerman, K.A. & Murphy-Ullrich, J.E. The role of the endoplasmic reticulum protein calreticulin in mediating TGF-β-stimulated extracellular matrix production in fibrotic disease. J. Cell Commun. Signal. 12, 289–299 (2018). https://doi.org/10.1007/s12079-017-0426-2
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DOI: https://doi.org/10.1007/s12079-017-0426-2