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2017 ; 8
(ä): 1381
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Combining V?9V?2 T Cells with a Lipophilic Bisphosphonate Efficiently Kills
Activated Hepatic Stellate Cells
#MMPMID29118758
Zhou X
; Gu Y
; Xiao H
; Kang N
; Xie Y
; Zhang G
; Shi Y
; Hu X
; Oldfield E
; Zhang X
; Zhang Y
Front Immunol
2017[]; 8
(ä): 1381
PMID29118758
show ga
Activated hepatic stellate cells (aHSCs) are now established as a central driver
of fibrosis in human liver injury. In the presence of chronic or repeated injury,
fibrosis, cirrhosis, and hepatocellular carcinoma (HCC) can occur, so there is
interest in down-regulating aHSCs activity in order to treat these diseases.
Here, we report that V?9V?2 T cells are reduced in patients with liver cirrhosis,
stimulating us to investigate possible interactions between V?9V?2 T cells and
aHSCs. We find that V?9V?2 T cells kill aHSCs and killing is enhanced when aHSCs
are pretreated with BPH-1236, a lipophilic analog of the bone resorption drug
zoledronate. Cytotoxicity is mediated by direct cell-to-cell contact as shown by
Transwell experiments and atomic force microscopy, with BPH-1236 increasing the
adhesion between aHSCs and V?9V?2 T cells. Mechanistically, BPH-1236 functions by
inhibiting farnesyl diphosphate synthase, leading to accumulation of the
phosphoantigen isopentenyl diphosphate and recognition by V?9V?2 T cells. The
cytolytic process is largely dependent on the perforin/granzyme B pathway. In a
Rag2(-/-)?c(-/-) immune-deficient mouse model, we find that V?9V?2 T cells
home-in to the liver, and when accompanied by BPH-1236, kill not only orthotopic
aHSCs but also orthotopic HCC tumors. Collectively, our results provide the first
proof-of-concept of a novel immunotherapeutic strategy for the treatment of
fibrosis-cirrhosis-HCC diseases using adoptively transferred V?9V?2 T cells,
combined with a lipophilic bisphosphonate.