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2016 ; 7
(1
): e2057
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Interleukin-33 enhances programmed oncosis of ST2L-positive low-metastatic cells
in the tumour microenvironment of lung cancer
#MMPMID26775708
Akimoto M
; Hayashi JI
; Nakae S
; Saito H
; Takenaga K
Cell Death Dis
2016[Jan]; 7
(1
): e2057
PMID26775708
show ga
The proinflammatory interleukin-33 (IL-33) binds to its receptor ST2L on the
surface of immune cells and stimulates the production of Th2 cytokines; however,
the effects of IL-33 on tumour cells are poorly understood. Here we show that ST2
was significantly downregulated in human lung cancer tissues and cells compared
with normal lung tissues and cells. IL-33 expression was also inversely
correlated with the stages of human lung cancers. In accordance with this
finding, low-metastatic cells but not high-metastatic cells derived from Lewis
lung carcinoma expressed functional ST2L. IL-33 was abundantly present in the
tumours established by the low-metastatic cells compared with those formed by the
high-metastatic cells. Although the low-metastatic cells scarcely expressed IL-33
in vitro, these cells did expry 6ess this molecule in vivo, likely due to
stimulation by intratumoural IL-1? and IL-33. Importantly, IL-33 enhanced the
cell death of ST2L-positive low-metastatic cells, but not of ST2L-negative
high-metastatic cells, under glucose-depleted, glutamine-depleted and hypoxic
conditions through p38 MAPK and mTOR activation, and in a mitochondria-dependent
manner. The cell death was characterised by cytoplasmic blisters and karyolysis,
which are unique morphological features of oncosis. Inevitably, the
low-metastatic cells, but not of the high-metastatic cells, grew faster in
IL-33(-/-) mice than in wild-type mice. Furthermore, IL-33 selected for the
ST2L-positive, oncosis-resistant high-metastatic cells under conditions mimicking
the tumour microenvironment. These data suggest that IL-33 enhances lung cancer
progression by selecting for more malignant cells in the tumour microenvironment.