Smad4 deletion in blood vessel endothelial cells promotes ovarian cancer metastasis

Yang,Jie; Wang,Ya; Zeng,Zhen; Qiao,Long; Zhuang,Liang; Gao,Qinglei; Ma,Ding; Huang,Xiaoyuan

doi:10.3892/ijo.2017.3957

Smad4 deletion in blood vessel endothelial cells promotes ovarian cancer metastasis

Authors:
- Jie Yang
- Ya Wang
- Zhen Zeng
- Long Qiao
- Liang Zhuang
- Qinglei Gao
- Ding Ma
- Xiaoyuan Huang
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Affiliations: Cancer Biology Research Centre, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430030, P.R. China
Published online on: April 7, 2017 https://doi.org/10.3892/ijo.2017.3957
Pages: 1693-1700

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Abstract

SMAD4 is a critical co-smad in signal transduction pathways activated in response to transforming growth factor-β (TGF-β)-related ligands, regulating cell growth and differentiation. The roles played by SMAD4 inactivation in tumors highlighted it as a tumor-suppressor gene. Herein, we report that loss of SMAD4 expression in vascular endothelial cells promotes ovarian cancer invasion. SiRNA transfer of this gene in the HUVEC reduced SMAD4 protein expression and function. Although it reduced the vessel endothelial cell tubule formation in vitro and in vivo, it did not affect the tumor growth significantly in vivo. However, it weakened the barrier integrity in endothelial cells and increased vessel permeability and the ovarian cancer liver metastasis. We documented reduced angiogenesis and increased invasion histologically and by intravital microscopy, and gained mechanistic insight at the messenger and gene level. Finally, we found a negative reciprocal regulation between SMAD4 and FYN. FYN is one of the Src family kinases (SFK), activation of which can cause dissociation of cell-cell junctions and adhesion, resulting in paracellular hypermeability. Upon SMAD4 deletion, we detected high expression levels of FYN in vessel endothelial cells, suggesting the mechanism of the ovarian tumor cells cross the endothelial barrier and transform to an invasive phenotype.

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