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Interruption of the HGF paracrine loop by NK4, an HGF antagonist, reduces VEGF expression of CT26 cells

Interruption of the HGF paracrine loop by NK4, an HGF antagonist, reduces VEGF expression of CT26... Hepatocyte growth factor (HGF), acting through the c‑Met receptor, plays an important role in solid tumors. Various malignant cells utilize the biological actions of the HGF/c‑Met pathway for their dissociative, invasive and metastatic behaviors. HGF also binds to the receptor expressed on endothelial cells that stimulates angiogenesis, a process critical to continued growth of solid tumors. It is known that HGF induces in vitro expression of vascular endothelial growth factor (VEGF), a key agonist of tumor angiogenesis. In the present study, we showed using in vitro co-culture system with fibroblasts that VEGF expression of CT26 cells was amplified through tumor-stromal interaction, i.e., the HGF paracrine loop. This action was inhibited by interruption of the HGF paracrine loop by gene transfer of NK4, an HGF antagonist. In in vivo experiments, CT26 tumor growth and angiogenesis were markedly enhanced by fibroblast co-inoculation, while the effect of fibroblasts was not observed in NK4‑expressing CT26 cells. These findings suggest that NK4 exerted potent anti‑angiogenic action via indirectly inhibiting VEGF expression of tumor cells in addition to direct effects on endothelial cells. Thus, the HGF/c‑Met pathway may be a considerable candidate for molecular targeting strategy against tumor angiogenesis. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Oncology Reports Spandidos Publications

Interruption of the HGF paracrine loop by NK4, an HGF antagonist, reduces VEGF expression of CT26 cells

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References (33)

Publisher
Spandidos Publications
Copyright
Copyright © Spandidos Publications
ISSN
1021-335X
eISSN
1791-2431
DOI
10.3892/or.2013.2509
pmid
23722408
Publisher site
See Article on Publisher Site

Abstract

Hepatocyte growth factor (HGF), acting through the c‑Met receptor, plays an important role in solid tumors. Various malignant cells utilize the biological actions of the HGF/c‑Met pathway for their dissociative, invasive and metastatic behaviors. HGF also binds to the receptor expressed on endothelial cells that stimulates angiogenesis, a process critical to continued growth of solid tumors. It is known that HGF induces in vitro expression of vascular endothelial growth factor (VEGF), a key agonist of tumor angiogenesis. In the present study, we showed using in vitro co-culture system with fibroblasts that VEGF expression of CT26 cells was amplified through tumor-stromal interaction, i.e., the HGF paracrine loop. This action was inhibited by interruption of the HGF paracrine loop by gene transfer of NK4, an HGF antagonist. In in vivo experiments, CT26 tumor growth and angiogenesis were markedly enhanced by fibroblast co-inoculation, while the effect of fibroblasts was not observed in NK4‑expressing CT26 cells. These findings suggest that NK4 exerted potent anti‑angiogenic action via indirectly inhibiting VEGF expression of tumor cells in addition to direct effects on endothelial cells. Thus, the HGF/c‑Met pathway may be a considerable candidate for molecular targeting strategy against tumor angiogenesis.

Journal

Oncology Reports – Spandidos Publications

Published: Aug 1, 2013

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