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Published in: Clinical & Experimental Metastasis 5/2009

01-06-2009 | Research Paper

NK4, an HGF antagonist, prevents hematogenous pulmonary metastasis by inhibiting adhesion of CT26 cells to endothelial cells

Authors: Takeshi Kubota, Hiroaki Taiyoh, Atsushi Matsumura, Yasutoshi Murayama, Daisuke Ichikawa, Kazuma Okamoto, Hitoshi Fujiwara, Hisashi Ikoma, Masayoshi Nakanishi, Shojiro Kikuchi, Chouhei Sakakura, Toshiya Ochiai, Yukihito Kokuba, Hiroki Taniguchi, Teruhisa Sonoyama, Kunio Matsumoto, Toshikazu Nakamura, Eigo Otsuji

Published in: Clinical & Experimental Metastasis | Issue 5/2009

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Abstract

Hepatocyte growth factor (HGF) plays a definitive role in invasive, angiogenic, and metastatic activities of tumor cells by binding to the c-Met receptor. NK4, a competitive antagonist for HGF and the c-Met receptor, prevents tumor cell growth and metastasis via its bifunctional properties to act as an HGF antagonist and angiogenesis inhibitor. In the present study, we investigated the inhibitory effectiveness of NK4 on hematogenous pulmonary metastasis of the CT26 murine colon cancer cell line, focusing on tumor cell adhesion to endothelial cells. In an in vitro adhesion assay, HGF facilitated adhesion of CT26 cells to a murine endothelial cell line (F-2) in a dose-dependent manner. Furthermore, the enhancing effect of HGF on CT26-F-2 cell interaction was blocked by NK4 as well as by anti-HGF antibody. Similarly, HGF-induced phosphorylation of focal adhesion kinase (FAK), downstream of integrin signaling, was reduced by NK4 and by anti-HGF antibody. However, distinct integrin expression on the surface of CT26 cells was not altered by HGF. In an in vivo experimental pulmonary metastasis assay, stable NK4 expression potently decreased the number of pulmonary metastatic foci. The NK4-induced suppression of pulmonary metastasis was partially reversed when HGF was intraperitoneally administered in an adhesive phase. These results suggest that NK4 could act on tumor cells to inhibit CT26 adhesion to endothelial cells by reducing FAK phosphorylation, which is regulated by inside-out HGF/c-Met signaling, and thereby suppress hematogenous pulmonary metastasis.
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Metadata
Title
NK4, an HGF antagonist, prevents hematogenous pulmonary metastasis by inhibiting adhesion of CT26 cells to endothelial cells
Authors
Takeshi Kubota
Hiroaki Taiyoh
Atsushi Matsumura
Yasutoshi Murayama
Daisuke Ichikawa
Kazuma Okamoto
Hitoshi Fujiwara
Hisashi Ikoma
Masayoshi Nakanishi
Shojiro Kikuchi
Chouhei Sakakura
Toshiya Ochiai
Yukihito Kokuba
Hiroki Taniguchi
Teruhisa Sonoyama
Kunio Matsumoto
Toshikazu Nakamura
Eigo Otsuji
Publication date
01-06-2009
Publisher
Springer Netherlands
Published in
Clinical & Experimental Metastasis / Issue 5/2009
Print ISSN: 0262-0898
Electronic ISSN: 1573-7276
DOI
https://doi.org/10.1007/s10585-009-9244-0

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