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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Exp+Clin+Cancer+Res
2015 ; 34
(ä): 141
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Peritumoural neutrophils negatively regulate adaptive immunity via the PD-L1/PD-1
signalling pathway in hepatocellular carcinoma
#MMPMID26581194
He G
; Zhang H
; Zhou J
; Wang B
; Chen Y
; Kong Y
; Xie X
; Wang X
; Fei R
; Wei L
; Chen H
; Zeng H
J Exp Clin Cancer Res
2015[Nov]; 34
(ä): 141
PMID26581194
show ga
BACKGROUND: PD-L1 expression on neutrophils contributes to the impaired immune
response in infectious disease, but the detailed role of PD-L1 expression on
neutrophils in HCC remains unclear. METHODS: We investigated the phenotype and
morphology of neutrophils infiltrated in tumour tissues from both patients with
HCC and hepatoma-bearing mice. RESULTS: We found that neutrophils dominantly
infiltrated in the peritumoural region. The neutrophil-to-T cell ratio (NLR) was
higher in peritumoural tissue than that in the intratumoural tissue and was
negatively correlated with the overall survival of patients with HCC.
Infiltrating neutrophils displayed a phenotype of higher frequency of programmed
cell death ligand 1 (PD-L1) positive neutrophils. The ratio of PD-L1(+)
neutrophils-to-PD-1(+) T cells was higher in peritumoural tissue and better
predicted the disease-free survival of patients with HCC. We further confirmed a
higher frequency of PD-L1(+) neutrophils and PD-1(+) T cells in hepatoma-bearing
mice. Functionally, the PD-L1(+) neutrophils from patients with HCC effectively
suppressed the proliferation and activation of T cells, which could be partially
reversed by the blockade of PD-L1. CONCLUSIONS: Our results indicate that the
tumour microenvironment induces impaired antitumour immunity via the modulation
of PD-L1 expression on tumour infiltrating neutrophils.