RRC ID 1973
著者 Uchinokura S, Miyata S, Fukushima T, Itoh H, Nakano S, Wakisaka S, Kataoka H.
タイトル Role of hepatocyte growth factor activator (HGF activator) in invasive growth of human glioblastoma cells in vivo.
ジャーナル Int J Cancer
Abstract Hepatocyte growth factor/scatter factor (HGF/SF) is a multifunctional growth factor that is involved in invasive growth of tumor cells via its receptor MET, a protein product of c-met proto-oncogene. HGF activator (HGFA) is a serine proteinase responsible for the activation of proform of HGF/SF (proHGF/SF). In our study, we examined the effects of engineered expression of HGFA on 2 human glioblastoma cell lines (YKG-1 and U251). Both cells expressed MET, while only YKG-1 expressed endogenous proHGF/SF. Enhanced MET phosphorylation and increased migratory activity were induced by the expression of HGFA in YKG-1 cells in vitro in the presence of thrombin, which is a known activator of proHGFA. In contrast, MET phosphorylation was consistently observed in U251 that lacked endogenous HGF/SF, suggesting ligand-independent activation of MET in this cell line. Consequently, the expression of HGFA in U251 did not enhance the MET phosphorylation and following cellular response even with the thrombin treatment. However, addition of exogenous proHGF/SF resulted in enhanced migratory activity of HGFA-expressing U251 cells in the presence of thrombin in vitro. The engineered HGFA expression resulted in significantly enhanced tumor growth with increased vascular density in vivo when YKG-1 cells were implanted in nude mouse brain. This effect was not observed in U251 lacking endogenous proHGF/SF. These results indicate the possible existence of multiple mechanisms of MET activation in glioblastomas and that the activation system of proHGF/SF is important in progression of glioblastomas that express endogenous proHGF/SF and require ligand-dependent MET activation.
巻・号 118(3)
ページ 583-92
公開日 2006-2-1
DOI 10.1002/ijc.21362
PMID 16106403
MeSH Animals Brain Neoplasms / metabolism* Brain Neoplasms / pathology* Cell Movement Cell Proliferation Glioblastoma / metabolism Glioblastoma / pathology* Humans Male Mice Mice, Inbred BALB C Mice, Nude Mutation / genetics Neoplasm Invasiveness / pathology* Phosphorylation Proto-Oncogene Mas Proto-Oncogene Proteins / metabolism Proto-Oncogene Proteins c-met RNA, Messenger Receptors, Growth Factor / metabolism Reverse Transcriptase Polymerase Chain Reaction Serine Endopeptidases / physiology* Thrombin / pharmacology Tumor Cells, Cultured
IF 5.145
引用数 25
WOS 分野 ONCOLOGY
リソース情報
ヒト・動物細胞 KG-1-C(RCB0270) U251(RCB0461)