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ABL-Basic Research Program, National Cancer Institute, Frederick Cancer Research and Development Center, Frederick, Maryland 21702
Using double immunofluorescence staining and quantitative confocal laser scan microscopy, we show that the intensity of hepatocyte growth factor/scatter factor (HGF/SF) and Met staining in human primary brain tumors increases with the grade of malignancy and is prevalent in both the infiltrating tumor cells and endothelial hyperplastic areas. HGF/SF and Met also are expressed in vitro in glioblastoma multiforme cell lines as well as in normal human astrocyte (NHA) cells. Moreover, HGF/SF stimulates tyrosine phosphorylation of Met in both glioma cell lines and NHA cells, but only the glioma cell lines proliferate and become motile and invasive in response to HGF/SF, whereas the NHA cells are nonresponsive. These results implicate autocrine/paracrine Met-HGF/SF signaling in glioma tumorigenesis and suggest that HGF/SF signaling through Met is negatively regulated in NHA cells.
1 Sponsored by the National Cancer Institute, Department of Health and Human Services, under contract with ABL.
2 To whom requests for reprints should be addressed, at ABL-Basic Research Program, National Cancer Institute, Frederick Cancer Research and Development Center, P. O. Box B, Frederick, MD 21702.
Received 7/14/97. Accepted 10/ 3/97.
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