In:
Journal of Leukocyte Biology, Oxford University Press (OUP), Vol. 101, No. 4 ( 2017-04-01), p. 1037-1044
Abstract:
Immune-mediated liver injury is a central feature of hyperinflammatory diseases, such as hemophagocytic syndromes, yet the immunologic mechanisms underlying those processes are incompletely understood. In this study, we used the toll-like receptor 9 (TLR9)–mediated model of a hemophagocytic syndrome known as macrophage activation syndrome (MAS) to dissect the predominant immune cell populations infiltrating the liver during inflammation. We identified CD8+ T cells that unexpectedly produce interleukin-10 (IL-10) in addition to interferon-γ (IFN-γ) as a major hepatic population induced by TLR9 stimulation. Despite their ability to produce this anti-inflammatory cytokine, IL-10+ hepatic CD8+ T cells in TLR9–MAS mice did not resemble CD8+ T suppressor cells. Instead, the induction of these cells occurred independently of antigen stimulation and was partially dependent on IFN-γ. IL-10+ hepatic CD8+ T cells demonstrated an activated phenotype and high turnover rate, consistent with an effector-like identity. Transcriptional analysis of this population confirmed a gene signature of effector CD8+ T cells yet suggested responsiveness to liver injury–associated growth factors. Together, these findings suggest that IL-10+ CD8+ T cells induced by systemic inflammation to infiltrate the liver have initiated an inflammatory, rather than regulatory, program and may thus have a pathogenic role in severe, acute hepatitis.
Type of Medium:
Online Resource
ISSN:
0741-5400
,
1938-3673
DOI:
10.1189/jlb.3A0916-221RR
Language:
English
Publisher:
Oxford University Press (OUP)
Publication Date:
2017
detail.hit.zdb_id:
2026833-6
SSG:
12
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