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2015 ; 12
(ä): 147
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Up-regulation of A20/ABIN1 contributes to inefficient M1 macrophage polarization
during Hepatitis C virus infection
#MMPMID26382585
Fan C
; Zhang Y
; Zhou Y
; Li B
; He Y
; Guo Y
; Jia Z
Virol J
2015[Sep]; 12
(ä): 147
PMID26382585
show ga
BACKGROUND: Anti-hepatitis C virus (HCV) responses are often accompanied by an
increase in alanine aminotransferase levels in HCV-infected patients, indicating
that inflammatory responses are compromised by the virus. Additionally,
inflammation is associated with M1-polarizated macrophages, which secrete
cytokines such as tumor necrosis factor-?, interleukin-1, and interleukin-12, and
present antigens through phagocytosis. HCV-encoded proteins are presented as
specific viral antigens in particular infectious steps that influence the immune
response. For instance, HCV antigens impact macrophage PD-1 and Tim-3 expression,
and contribute to impaired viral clearance. Furthermore, circulatory HCV antigens
from infected patients inhibit dendritic cell differentiation, which raises the
possibility that HCV antigens may also interfere with macrophage polarization.
METHODS: In this study, the impact of HCV antigen stimulation on M1-polarized
macrophages was investigated. The influence of HCV antigens was evaluated by
reverse transcription polymerase chain reaction and enzyme-linked immunosorbent
assay. Specific changes were investigated clinically by flow cytometry and
immunofluorescence. Effects of NF-?B during the process were analyzed by western
blot. RESULTS: HCV infection dampened M1 macrophage polarization ex vivo and in
vitro. After antigen stimulation, NF-?B signaling was suppressed by the
up-regulation of A20 and A20-binding inhibitor of NF-?B binding protein, which
likely leads to a variation of functional molecules such as tumor necrosis
factor-?, CD163, matrix metalloproteinases, transferrin receptor-1, and CD100,
reflecting an anti-inflammatory reaction against M1-polarization. CONCLUSION: HCV
antigens stimulation up-regulates A20/A20-binding inhibitor of NF-?B binding
protein expression, which consequently contributes to inefficient M1 macrophage
polarization.