Hepatocytes induce Foxp3⁺ regulatory T cells by Notch signaling
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Hepatocytes induce Foxp3⁺ regulatory T cells by Notch signaling. / Burghardt, Sven; Claass, Benjamin; Erhardt, Annette; Karimi, Khalil; Tiegs, Gisa.
in: J LEUKOCYTE BIOL, Jahrgang 96, Nr. 4, 01.10.2014, S. 571-7.Publikationen: SCORING: Beitrag in Fachzeitschrift/Zeitung › SCORING: Zeitschriftenaufsatz › Forschung › Begutachtung
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TY - JOUR
T1 - Hepatocytes induce Foxp3⁺ regulatory T cells by Notch signaling
AU - Burghardt, Sven
AU - Claass, Benjamin
AU - Erhardt, Annette
AU - Karimi, Khalil
AU - Tiegs, Gisa
N1 - © 2014 Society for Leukocyte Biology.
PY - 2014/10/1
Y1 - 2014/10/1
N2 - The liver plays a pivotal role in maintaining immunological tolerance, although the exact molecular mechanism is still largely unknown. The induction of systemic tolerance by liver resident APCs has been attributed to peripheral deletion and to the induction of Tregs. HCs, the parenchymal cells in the liver, could function as nonprofessional APCs and interact and establish cell-cell contact with T lymphocytes. We hypothesized that HCs from healthy or regenerated livers may contribute to induction of functional Tregs. Here, we show that murine HCs induced Foxp3(+) Tregs within CD4(+) T cells in vitro, which increased in the presence of TGF-β. Interestingly, a further Foxp3(+) Treg expansion was observed if HCs were isolated from regenerated livers. Additionally, the induction of Foxp3(+) Tregs was associated with the Notch signaling pathway, as the ability of HCs to enhance Foxp3 was abolished by γ-secretase inhibition. Furthermore, HC-iTregs showed ability to suppress the proliferative response of CD4(+) T cells to anti-CD3 stimulation in vitro. Thus, HCs may play a pivotal role in the induction of tolerance via Notch-mediated conversion of CD4(+) T cells into Foxp3(+) Tregs upon TCR stimulation.
AB - The liver plays a pivotal role in maintaining immunological tolerance, although the exact molecular mechanism is still largely unknown. The induction of systemic tolerance by liver resident APCs has been attributed to peripheral deletion and to the induction of Tregs. HCs, the parenchymal cells in the liver, could function as nonprofessional APCs and interact and establish cell-cell contact with T lymphocytes. We hypothesized that HCs from healthy or regenerated livers may contribute to induction of functional Tregs. Here, we show that murine HCs induced Foxp3(+) Tregs within CD4(+) T cells in vitro, which increased in the presence of TGF-β. Interestingly, a further Foxp3(+) Treg expansion was observed if HCs were isolated from regenerated livers. Additionally, the induction of Foxp3(+) Tregs was associated with the Notch signaling pathway, as the ability of HCs to enhance Foxp3 was abolished by γ-secretase inhibition. Furthermore, HC-iTregs showed ability to suppress the proliferative response of CD4(+) T cells to anti-CD3 stimulation in vitro. Thus, HCs may play a pivotal role in the induction of tolerance via Notch-mediated conversion of CD4(+) T cells into Foxp3(+) Tregs upon TCR stimulation.
KW - Animals
KW - Calcium-Binding Proteins
KW - Cytokines
KW - Forkhead Transcription Factors
KW - Hepatocytes
KW - Intercellular Signaling Peptides and Proteins
KW - Interleukin-2 Receptor alpha Subunit
KW - Lymphocyte Activation
KW - Lymphocyte Count
KW - Male
KW - Membrane Proteins
KW - Mice
KW - Models, Biological
KW - Receptors, Notch
KW - Signal Transduction
KW - T-Lymphocyte Subsets
KW - T-Lymphocytes, Regulatory
KW - Transforming Growth Factor beta
U2 - 10.1189/jlb.2AB0613-342RR
DO - 10.1189/jlb.2AB0613-342RR
M3 - SCORING: Journal article
C2 - 24970859
VL - 96
SP - 571
EP - 577
JO - J LEUKOCYTE BIOL
JF - J LEUKOCYTE BIOL
SN - 0741-5400
IS - 4
ER -