Abstract
Biliary epithelial cells (BECs) provide the first line of defense against lumenal microbes in the biliary system. BECs express a variety of pathogen recognition receptors and can activate several intracellular signaling cascades to initiate antimicrobial defenses, including production of several anti-microbial peptides, cytokines, chemokines, and adhesion molecules. BECs also secrete immunoglobulin A and interact with other cells through expression and release of adhesion molecules and immune mediators. Recently, several reports suggest a correlation between apoptosis and autoimmunity through ineffective clearance of self-antigens. Primary biliary cirrhosis (PBC) is a slowly progressive, autoimmune cholestatic liver disease characterized by highly specific antimitochondrial antibodies (AMAs) and the specific immune-mediated destruction of BECs. We have demonstrated that the AMA self-antigen, namely the E2 subunit of the pyruvate dehydrogenase complex, is detectable in its antigenically reactive form within apoptotic blebs from human intrahepatic biliary epithelial cells and activates innate immune responses. Primary sclerosing cholangitis (PSC) is a chronic cholestatic liver disease characterized by inflammation and the presence of concentric fibrosis of intrahepatic and/or extrahepatic bile ducts, eventually leading to cirrhosis. However, apoptosis does not appear to play a central role in PSC. Despite both diseases involving immune-mediated injury to bile ducts, apoptosis occurs more commonly overall in PBC where it likely plays a unique role.
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Abbreviations
- AMAs:
-
Antimitochondrial antibodies
- ANA:
-
Anti-nuclear antibody
- BCOADC-E2:
-
The E2 subunit of the branched chain 2-oxo acid dehydrogenase complex
- BECs:
-
Biliary epithelial cells
- BrEPCs:
-
Human bronchial epithelial cells
- CX3CR1:
-
CX3C chemokine receptor 1
- DC:
-
Dendritic cells
- DECR1:
-
2,4-Dienoyl coenzyme A reductase 1
- DR:
-
Death receptor
- FasL:
-
Fas ligand
- gp210:
-
Glycoprotein 210 kD
- hBD:
-
Human β-defensin
- HiBECs:
-
Human intrahepatic biliary epithelial cells
- ICAM-1:
-
Intercellular adhesion molecule 1
- IFN-β1:
-
Interferon β1
- IgA:
-
Immunoglobulin A
- IL-12A:
-
Interleukin-12A
- IL-12RB2:
-
Interleukin-12 receptor beta2 subunit
- IRAK-1:
-
IL-1 receptor-associated kinase
- IRAK-M:
-
Interleukin-1 receptor-associated kinase M
- IRF-3:
-
Interferon-regulatory factor-3
- LFA-1:
-
Lymphocyte function-associated antigen-1
- LFA-3:
-
Lymphocyte function-associated antigen 3
- LPS:
-
Lipopolysaccharide
- MAdCAM1:
-
Mucosal addressin cell adhesion molecule-1
- MaEPCs:
-
Human mammary epithelial cells
- MAPK:
-
Mitogen-activated protein kinases
- MCP-1:
-
Monocyte chemotactic protein-1
- MDA-5:
-
Melanoma differentiation associated gene 5
- MPT:
-
Mitochondrial membrane permeability transition
- MxA:
-
Myxovirus resistance protein A
- MyD88:
-
Myeloid differentiation factor 88
- (NF)–kB:
-
Nuclear factor
- OGDC-E2:
-
The E2 subunit of the oxo-glutarate dehydrogenase complex
- PAMPs:
-
Pathogen-associated molecular patterns
- pANCA:
-
Perinuclear anti-neutrophil cytoplasmic antibody
- PBC:
-
Primary biliary cirrhosis
- PDC-E2:
-
The E2 subunit of the pyruvate dehydrogenase complex
- poly I:C:
-
Polyinosinic–polycytidylic acid
- PSC:
-
Primary sclerosing cholangitis
- Rig-1:
-
Retinoic acid inducible gene-1
- STAT4:
-
Signal transducer and activator of transcription 4
- SSA/Ro:
-
Sjogren’s syndrome antigen A
- TRAIL:
-
TNF-related apoptosis-inducing ligand
- TLRs:
-
Toll-like receptors
- TNF-R1:
-
TNF-α receptor-1
- TUNEL:
-
TdT-mediated deoxyuridine triphosphate nick-end labeling
- UCDA:
-
Ursodeoxycholic acid
- UQCR2:
-
Ubiquiol cytochrome c reductase complex core protein II
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Kawata, K., Kobayashi, Y., Gershwin, M.E. et al. The Immunophysiology and Apoptosis of Biliary Epithelial Cells: Primary Biliary Cirrhosis and Primary Sclerosing Cholangitis. Clinic Rev Allerg Immunol 43, 230–241 (2012). https://doi.org/10.1007/s12016-012-8324-0
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DOI: https://doi.org/10.1007/s12016-012-8324-0