Carcinoembryonic antigen-related cell adhesion molecule 1 controls IL-2-dependent regulatory T-cell induction in immune-mediated hepatitis in mice
Hepatology, ISSN: 1527-3350, Vol: 68, Issue: 1, Page: 200-214
2018
- 20Citations
- 34Captures
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Metrics Details
- Citations20
- Citation Indexes20
- 20
- CrossRef18
- Captures34
- Readers34
- 34
Article Description
A dysbalance between effector T cells (Tconv) and regulatory T cells (Tregs) and impaired Treg function can cause autoimmune liver disease. Therefore, it is important to identify molecular mechanisms that control Treg homeostasis. Carcinoembryonic antigen-related cell adhesion molecule 1 (CEACAM1; CD66a) is an immune coreceptor with dichotomous roles in T-cell regulation: its short isoform (CEACAM1S) can activate T cells and induce Tregs, whereas its long isoform (CEACAM1L), containing two intracellular immune receptor tyrosine-based inhibitory motifs, can inhibit activated T-cell function. In the liver, CEACAM1 has antifibrotic effects in models of nonalcoholic steatohepatitis. However, its role in immune-mediated hepatitis is unknown. In the mouse model of concanavalin A–induced CD4 T-cell-dependent liver injury, liver damage was aggravated and persisted in Ceacam1 mice. Concomitantly, we observed hyperexpansion of Tconv, but reduction of interleukin (IL)-2 production and hepatic forkhead box protein P3 (Foxp3)CD4 Treg numbers. CEACAM1CD4 T cells showed impaired IL-2-mediated signal transducer and activator of transcription 5 (STAT5) phosphorylation, which correlated with a failure of naïve CEACAM1CD4 T cells to convert into Tregs in vitro. Furthermore, CEACAM1 Tregs expressed reduced levels of Foxp3, CD25, and B-cell lymphoma 2. Adoptive transfer experiments demonstrated that hepatic Treg expansion and suppressive activity required CEACAM1 expression on both CD4 T cells and Tregs. We identified predominant CEACAM1S expression on hepatic CD4 T cells and Tregs from mice with acute liver injury and expression of both isoforms in liver-derived CD4 T-cell clones from patients with liver injury. Conclusion: Our data suggest that CEACAM1S expression in CD4 T cells augments IL-2 production and STAT5 phosphorylation leading to enhanced Treg induction and stability, which, ultimately, confers protection from T-cell-mediated liver injury. (Hepatology 2018;68:200-214).
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85049597256&origin=inward; http://dx.doi.org/10.1002/hep.29812; http://www.ncbi.nlm.nih.gov/pubmed/29377208; https://journals.lww.com/01515467-201807000-00027; https://dx.doi.org/10.1002/hep.29812; https://journals.lww.com/hep/abstract/2018/07000/carcinoembryonic_antigen_related_cell_adhesion.22.aspx
Ovid Technologies (Wolters Kluwer Health)
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