Abstract
As the inner lining of the gastrointestinal tract, the intestinal epithelium serves an essential role in innate immune function at the interface between the host and microbiota. Given the unique environmental challenges and thus physiologic secretory functions of this surface, it is exquisitely sensitive to perturbations that affect its capacity to resolve endoplasmic reticulum (ER) stress. Genetic deletion of factors involved in the unfolded protein response (UPR), which functions in the resolution of ER stress that arises from misfolded proteins, result in spontaneous intestinal inflammation closely mimicking human inflammatory bowel disease (IBD). This is demonstrated by observations wherein deletion of genes such as Xbp1 and Agr2 profoundly affects the intestinal epithelium and results in spontaneous intestinal inflammation. Moreover, both genes, along with others (e.g., ORDML3) represent genetic risk factors for human IBD, both Crohn's disease and ulcerative colitis. Here, we review the current mechanistic understanding for how unresolved ER stress can lead to intestinal inflammation and highlight the findings that implicate ER stress as a genetically affected biological pathway in IBD. We further discuss environmental and microbial factors that might impact on the epithelium's capacity to resolve ER stress and which may constitute exogenous factors that may precipitate disease in genetically susceptible individuals.
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Abbreviations
- ABCG2:
-
ATP-binding cassette G2
- AIDS:
-
Acquired immunodeficiency syndrome
- AIEC:
-
Adherent-invasive Escherichia coli
- AGR2:
-
Anterior gradient 2
- ASK1:
-
Apoptosis signal-regulating kinase 1
- ATF4:
-
Activating transcription factor 4
- ATF6:
-
Activating transcription factor 6
- BAK:
-
BCL2-antagonist/killer 1
- BAX:
-
BCL2-associated X protein
- BBF2H7:
-
Box B-binding factor 2 human homolog on chromosome 7
- BiP:
-
Binding immunoglobulin protein
- CD:
-
Crohn's disease
- CEACAM6:
-
Carcinoembryonic antigen-related cell adhesion molecule 6
- CHOP:
-
C/EBP homologous protein
- CREB4:
-
CRE-binding protein 4
- CREBH:
-
CRE-binding protein H
- C/EBP:
-
CCAAT/enhancer-binding protein
- DSS:
-
Dextran sodium sulfate
- eIF2α:
-
Elongation initiation factor 2α
- ER:
-
Endoplasmic reticulum
- EDEM1:
-
ER degradation enhancer, mannosidase alpha-like 1
- ENU:
-
N-ethyl-N-nitrosourea
- ERAD:
-
ER-associated degradation
- GADD34:
-
Growth arrest and DNA damage-inducible protein 34
- grp78:
-
78kDa glucose-regulated protein
- Grp94:
-
Glucose regulated protein 94
- HIV:
-
Human immunodeficiency virus
- IBD:
-
Inflammatory bowel disease
- IEC:
-
Intestinal epithelial cell
- IRE1:
-
Inositol-requiring enzyme 1
- IEL:
-
Intraepithelial lymphocyte
- JNK:
-
Jun N-terminal kinase
- lZIP:
-
Leucine zipper protein
- MEF:
-
Mouse embryonic fibroblast
- MTP:
-
Microsomal triglyceride transfer protein
- MSI1:
-
Musashi-1
- OASIS:
-
Old astrocyte specifically induced substance
- ORMDL3:
-
Orosomucoid-like 3
- PERK:
-
Protein kinase related (PKR)-like ER kinase
- P58IPK :
-
Protein kinase inhibitor of 58 kDa
- PBA:
-
4-phenyl butyrate
- RIDD:
-
Regulated IRE1-dependent decay
- S1P:
-
Site-1 protease
- S2P:
-
Site-2 protease
- SPF:
-
Specific pathogen-free
- SERCA2b:
-
Sarcoplasmic/endoplasmic reticulum calcium ATPase 2
- SERCA:
-
Sarco-endoplasmic reticulum Ca2+ pump
- TNBS:
-
Trinitrobenzene sulfonic acid
- TNF:
-
Tumor necrosis factor
- TRAF2:
-
TNF receptor associated factor 2
- TNFR1:
-
Tumor necrosis factor receptor type 1
- TLR:
-
Toll-like receptor
- TUDCA:
-
Tauro-ursodeoxycholic acid
- UC:
-
Ulcerative colitis
- UDCA:
-
Ursodeoxy-cholic acid
- uORF:
-
Upstream open reading frame
- UTR:
-
5' untranslated region
- UPR:
-
Unfolded protein response
- VLDL:
-
Very low density lipoprotein
- XBP1:
-
X-box binding protein-1
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Acknowledgments
Work in the authors' laboratories has been supported by the European Research Council under the European Community's Seventh Framework Programme (FP7/2007-2013) / ERC Grant agreement n° 260961; the National Institute for Health Research Cambridge Biomedical Research Centre; the Addenbrooke's Charitable Trust (all A.K.); NIH grants DK044319, DK051362, DK053056, DK088199, and the Harvard Digestive Diseases Center (HDDC) (DK0034854) (all R.S.B.)
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The author's declare that they have no conflict of interests.
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This article is a contribution to the special issue on “The unfolded protein response in immune diseases”—Guest Editors: Richard Blumberg and Arthur Kaser
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Kaser, A., Adolph, T.E. & Blumberg, R.S. The unfolded protein response and gastrointestinal disease. Semin Immunopathol 35, 307–319 (2013). https://doi.org/10.1007/s00281-013-0377-5
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DOI: https://doi.org/10.1007/s00281-013-0377-5