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- Title
Dysregulated HAI-2 Plays an Important Role in Renal Cell Carcinoma Bone Metastasis through Ligand-Dependent MET Phosphorylation.
- Authors
Yamasaki, Koji; Mukai, Shoichiro; Sugie, Satoru; Nagai, Takahiro; Nakahara, Kozue; Kamibeppu, Toyoharu; Sakamoto, Hiromasa; Shibasaki, Noboru; Terada, Naoki; Toda, Yoshinobu; Kataoka, Hiroaki; Kamoto, Toshiyuki
- Abstract
MET, a <italic>c-met</italic> proto-oncogene product and hepatocyte growth factor (HGF) receptor, is known to play an important role in cancer progression, including bone metastasis. In a previous study, we reported increased expression of MET and matriptase, a novel activator of HGF, in bone metastasis. In this study, we employed a mouse model of renal cell carcinoma (RCC) bone metastasis to clarify the significance of the HGF/MET signaling axis and the regulator of HGF activator inhibitor type-2 (HAI-2). Luciferase-transfected 786-O cells were injected into the left cardiac ventricle of mice to prepare the mouse model of bone metastasis. The formation of bone metastasis was confirmed by whole-body bioluminescent imaging, and specimens were extracted. Expression of HGF/MET-related molecules was analyzed. Based on the results, we produced HAI-2 stable knockdown 786-O cells, and analyzed invasiveness and motility. Expression of HGF and matriptase was increased in bone metastasis compared with the control, while that of HAI-2 was decreased. Furthermore, we confirmed increased phosphorylation of MET in bone metastasis. The expression of matriptase was upregulated, and both invasiveness and motility were increased significantly by knockdown of HAI-2. The significance of ligand-dependent MET activation in RCC bone metastasis is considered, and HAI-2 may be an important regulator in this system.
- Subjects
ANIMAL experimentation; BIOLOGICAL models; BONE metastasis; CELL culture; CELLULAR signal transduction; GROWTH factors; MICE; ONCOGENES; PHOSPHORYLATION; RENAL cell carcinoma; DISEASE progression
- Publication
Cancers, 2018, Vol 10, Issue 6, p190
- ISSN
2072-6694
- Publication type
Article
- DOI
10.3390/cancers10060190