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2016 ; 213
(6
): 1079-93
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Interferon-? facilitates hepatic antiviral T cell retention for the maintenance
of liver-induced systemic tolerance
#MMPMID27139489
Zeng Z
; Li L
; Chen Y
; Wei H
; Sun R
; Tian Z
J Exp Med
2016[May]; 213
(6
): 1079-93
PMID27139489
show ga
Persistent exposure to liver pathogens leads to systemic antigen-specific
tolerance, a major cause of chronicity during hepatotropic infection. The
mechanism regarding how this systemic tolerance is maintained remains poorly
elucidated. In a well established mouse model of hepatitis B virus (HBV)
persistence-induced systemic tolerance, we observed that interferon-? (IFN-?)
deficiency led to complete loss of tolerance, resulting in robust anti-HBV
responses upon peripheral vaccination. The recovery of vaccine-induced anti-HBV
responses was mainly caused by the retained antigen-specific CD4(+) T cells
rather than decreased functional inhibitory cells in the periphery.
Mechanistically, HBV persistence induced sustained hepatic CD4(+) T cell-derived
IFN-? production. IFN-? was found to promote CXCL9 secretion from liver-resident
macrophages. This T cell chemokine facilitated the retention of antiviral CD4(+)
T cells in the liver in a CXCR3-dependent manner. Hepatic sequestrated antiviral
CD4(+) T cells subsequently underwent local apoptotic elimination partially via
cytotoxic T lymphocyte-associated protein 4 ligation. These findings reveal an
unexpected tolerogenic role for IFN-? during viral persistence in the liver,
providing new mechanistic insights regarding the maintenance of systemic
antigen-specific tolerance during HBV persistence.