Inhibiting YAP expression suppresses pancreatic cancer progression by disrupting tumor-stromal interactions.

Abstract:

BACKGROUND:Hippo/YAP pathway is known to be important for development, growth and organogenesis, and dysregulation of this pathway leads to tumor progression. We and others find that YAP is up-regulated in pancreatic ductal adenocarcinoma (PDAC) and associated with worse prognosis of patients. Activated pancreatic stellate cells (PSCs) forming the components of microenvironment that enhance pancreatic cancer cells (PCs) invasiveness and malignance. However, the role and mechanism of YAP in PDAC tumor-stromal interaction is largely unknown. METHODS:The expression of YAP in Pancreatic cancer cell lines and PDAC samples was examined by Western blot and IHC. The biological role of YAP on cancer cell proliferation, epithelial-mesenchymal transition (EMT) and invasion were evaluated by MTT, Quantitative real-time PCR analysis, Western blot analysis and invasion assay. The effect of YAP on PSC activation was evaluated by PC-PSC co-culture conditions and xenograft PDAC mouse model. RESULTS:Firstly, knockdown of YAP inhibits PDAC cell proliferation and invasion in vitro. In addition, YAP modulates the PC and PSC interaction via reducing the production of connective tissue growth factor (CTGF) from PCs, inhibits paracrine-mediated PSC activation under PC-PSC co-culture conditions and in turn disrupts TGF-β1-mediated tumor-stromal interactions. Lastly, inhibiting YAP expression prevents tumor growth and suppresses desmoplastic reaction in vivo. CONCLUSIONS:These results demonstrate that YAP contributes to the proliferation and invasion of PC and the activation of PSC via tumor-stromal interactions and that targeting YAP may be a promising therapeutic strategy for PDAC treatment.

journal_name

J Exp Clin Cancer Res

authors

Jiang Z,Zhou C,Cheng L,Yan B,Chen K,Chen X,Zong L,Lei J,Duan W,Xu Q,Li X,Wang Z,Ma Q,Ma J

doi

10.1186/s13046-018-0740-4

subject

Has Abstract

pub_date

2018-03-27 00:00:00

pages

69

issue

1

eissn

0392-9078

issn

1756-9966

pii

10.1186/s13046-018-0740-4

journal_volume

37

pub_type

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