Biliary epithelium and liver B cells exposed to bacteria activate intrahepatic MAIT cells through MR1
Open accessAbstract
BACKGROUND & AIMS: Mucosal-Associated Invariant T (MAIT) cells are innate-like T cells characterised by the invariant TCR-chain, Vα7.2-Jα33, and are restricted by MR1, which presents bacterial vitamin B metabolites. They are important for antibacterial immunity at mucosal sites; however, detailed characteristics of liver-infiltrating MAIT (LI-MAIT) and their role in biliary immune surveillance remain unexplored. METHODS: The phenotype and intrahepatic localisation of human LI-MAIT cells was examined in diseased and normal livers. MAIT cell activation in response to E. coli-exposed macrophages, biliary epithelial cells (BEC) and liver B cells was assessed with/without anti-MR1. RESULTS: Intrahepatic MAIT cells predominantly localised to bile ducts in the portal tracts. Consistent with this distribution, they expressed biliary tropic chemokine receptors CCR6, CXCR6, and integrin αEβ7. LI-MAIT cells were also present in the hepatic sinusoids and possessed tissue-homing chemokine receptor CXCR3 and integrins LFA-1 and VLA-4, suggesting their recruitment via hepatic sinusoids. LI-MAIT cells were enriched in the parenchyma of acute liver failure livers compared to chronic diseased livers. LI-MAIT cells had an activated, effector memory phenotype, expressed α4β7 and receptors for IL-12, IL-18, and IL-23. Importantly, in response to E. coli-exposed macrophages, liver B cells and BEC, MAIT cells upregulated IFN-γ and CD40 Ligand and degranulated in an MR1-dependent, cytokine-independent manner. In addition, diseased liver MAIT cells expressed T-bet and RORγt and the cytokines IFN-γ, TNF-α, and IL-17. CONCLUSIONS: Our findings provide the first evidence of an immune surveillance effector response for MAIT cells towards BEC in human liver; thus they could be manipulated for treatment of biliary disease in the future.
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BECs produce CXCL16 and CCL20 which are ligands for CXCR6 and CCR6 expressed on the MAIT cell surface.
“BECs produce CXCL16 and CCL20 which 445 are ligands for CXCR6 and CCR6 expressed on the MAIT cell surface(89).”
From The liver as a central "hub" of the immune system: pathophysiological implications (2025) · cites this paper as [89]
MAIT cells have been identified as a sort of biliary firewall, protecting the biliary epithelium against microbial triggers from the gut.
“They have been identified as a sort of biliary firewall, protecting the biliary 444 epithelium against microbial triggers from the gut.”
From The liver as a central "hub" of the immune system: pathophysiological implications (2025) · cites this paper as [89]
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- Authors
- Jeffery, H. C., van Wilgenburg, B., Kurioka, A., Parekh, K., Stirling, K., Roberts, S., Dutton, E. E., Hunter, S., Geh, D., Braitch, M. K., Rajanayagam, J., Iqbal, T., Pinkney, T., Brown, R., Withers, D. R., Adams, D. H., Klenerman, P., & Oo, Y. H.
- Affiliations
- University of Birmingham (GB)
- University of Oxford (GB)
- University Hospitals Birmingham NHS Foundation Trust (GB)
- Corresponding author
- Oo, Ye H.
- ORCID
- Venue
- Journal of Hepatology
- Publisher
- Elsevier BV
- Published
- 2016-05
- Volume
- 64
- Issue
- 5
- Pages
- 1118-1127
- ISSN
- 0168-8278 (ISSN-L)
- PMC
- PMC4822535
- OpenAlex
- W2288573834
- Cited by
- 212
- References
- 53
- Citations by year
- 2026: 11 · 2025: 15 · 2024: 17 · 2023: 16 · 2022: 26 · 2021: 17 · 2020: 34 · 2019: 20 · 2018: 27 · 2017: 18 · 2016: 10
- FWCI
- 10.87
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Locations
- Journal of Hepatology (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- University of Birmingham Research Portal (University of Birmingham) (submittedVersion, cc-by)
- Funders
- Wellcome Trust (WT091663MA, 091663, 109965/Z/15/Z, 110199/Z/15/Z)
- Queen Elizabeth Hospital Birmingham Charity
- National Institute for Health and Care Research (NF-SI-0512-10080, NF-SI-0515-10005, NF-SI-0510-10204)
- Bowel Disease Research Foundation
- National Institutes of Health
- Medical Research Council (G1002552, MC_PC_12020)
- Biotechnology and Biological Sciences Research Council (1511338)
- National Institute of Allergy and Infectious Diseases (U19AI082630)
- Topics
- Health Sciences › Medicine › Hepatology › Liver Diseases and Immunity
- Life Sciences › Immunology and Microbiology › Immunology › T-cell and B-cell Immunology
- Health Sciences › Medicine › Surgery › Pediatric Hepatobiliary Diseases and Treatments
- Keywords
- mucosal-associated invariant T cells, MR1, biliary epithelium, Escherichia coli, macrophages, chemokine receptors, acute liver failure, interferon-gamma, CD40 ligand, Th1/Th17 differentiation, biliary tract diseases
- MeSH terms
- Mucosal-Associated Invariant T Cells, B-Lymphocytes, Bile Ducts, Intrahepatic, Escherichia coli, Humans, Immunity, Innate, Liver, Lymphocyte Activation, T-Lymphocyte Subsets
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