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2015 ; 16
(8
): 1220-30
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Activation of IL-8 via PI3K/Akt-dependent pathway is involved in leptin-mediated
epithelial-mesenchymal transition in human breast cancer cells
#MMPMID26121010
Wang L
; Tang C
; Cao H
; Li K
; Pang X
; Zhong L
; Dang W
; Tang H
; Huang Y
; Wei L
; Su M
; Chen T
Cancer Biol Ther
2015[]; 16
(8
): 1220-30
PMID26121010
show ga
BACKGROUND INFORMATION: Previous studies have revealed that leptin may be
involved in epithelial-mesenchymal transition (EMT), a crucial initiator of
cancer progression to facilitate metastatic cascade, increase tumor recurrence,
and ultimately cause poor prognosis. However, the underlying mechanism remains
unclear. The aim of our present study was to investigate the effect of leptin on
EMT of breast cancer cells and the underlying mechanism. RESULTS: Our data
demonstrated that leptin significantly increased the phosphorylation of STAT3,
Akt, and ERK1/2, elevated the expression of IL-8, and induced breast cancer cells
to undergo EMT. The effect of leptin on IL-8 could visibly abolished by the
inhibitor of PI3K LY294002. In addition, leptin-induced EMT of breast cancer
cells was blocked by anti-IL-8 antibodies. Examination of the expression of ObR,
leptin, IL-8 and EMT-related biomarkers in patient specimens demonstrated that
malignant breast carcinoma with lymph node metastases (LNM), which represents
poor prognosis, expressed higher levels of ObR, leptin, IL-8 than other types of
breast cancer, and displayed more obvious EMT transversion. In vivo xenograft
experiment revealed that leptin signally promoted tumor growth and metastasis and
increased the expressions of IL-8 and EMT-related biomarkers. CONCLUSIONS: Our
results support that leptin-induced EMT in breast cancer cells requires IL-8
activation via the PI3K/Akt signal pathway.