TGF-β-dependent induction of CD4+CD25+Foxp3 + Tregs by liver sinusoidal endothelial cells

Antonella Carambia, Barbara Freund, Dorothee Schwinge, Markus Heine, Alena Laschtowitz, Samuel Huber, David C. Wraith, Thomas Korn, Christoph Schramm, Ansgar W. Lohse, Joerg Heeren, Johannes Herkel*

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

97 Citations (Scopus)

Abstract

BACKGROUND & AIMS: CD4(+) CD25(+) Foxp3(+) regulatory T cells (Tregs) have a profound ability to control immune responses. We have previously shown that the liver is a major source of peripherally induced Tregs. Here, we investigate the liver cell types and molecular mechanisms responsible for hepatic Treg induction.

METHODS: To assess the Treg-inducing potential of liver resident antigen-presenting cell types, we studied the conversion of Foxp3(-) non-Tregs into Foxp3(+) Tregs induced by liver dendritic cells (DCs), liver sinusoidal endothelial cells (LSECs) or Kupffer cells (KCs). The dependency of Treg induction on TGF-β was tested in Treg conversion assays using T cells with reduced TGF-β sensitivity. The suppressive potential of liver cell-induced Tregs was assessed by an in vitro suppression assay and in vivo, in the model of experimental autoimmune encephalomyelitis (EAE).

RESULTS: All tested liver cell types were capable of inducing Foxp3(+) Tregs; however, LSECs were most efficient in inducing Tregs. Treg-induction was antigen-specific and depended on TGF-β. LSECs featured membrane-bound LAP/TGF-β and the anchor molecule GARP, which is required for tethering LAP/TGF-β to the cell membrane. LSEC-induced Tregs suppressed proliferation and cytokine secretion of effector T cells in vitro. LSEC-induced Tregs were also functional suppressors in vivo, as neuroantigen-specific Tregs induced by LSECs were able to suppress EAE.

CONCLUSIONS: We demonstrate that LSECs are the major liver cell type responsible for TGF-β dependent hepatic Treg induction. The extraordinary capacity of LSECs to induce Tregs was associated with their unique ability to tether TGF-β to their membrane.

Original languageEnglish
Pages (from-to)594-599
Number of pages6
JournalJournal of Hepatology
Volume61
Issue number3
DOIs
Publication statusPublished - 2 May 2014

Bibliographical note

Copyright © 2014. Published by Elsevier B.V.

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