title: The met proto-oncogene receptor and lumen formation.
abstract: The met proto-oncogene product (Met) and its ligand, hepatocyte growth factor/scatter factor (HGF/SF), have been implicated in cell mitogenic response, cell motility, and the promotion of the ordered spatial arrangement of tissue. By means of confocal laser-scanning microscopy, it was shown that Met is expressed in cells bordering lumen-like structures that resemble ducts in the human mammary cell line T47D. In human breast tissue biopsies, Met staining was intense in normal cells bordering mammary ducts but was reduced in adjacent tumor tissue. Met staining in lumen-forming organs colocalizes with staining of antibody to phosphotyrosine, which suggests that the Met receptor and its substrates may be activated in lumen structures or ducts. HGF/SF treatment of human epithelial carcinoma cell lines resulted in the formation of lumen-like structures in vitro. Reduced expression of Met could be related to the extent of tumor cell differentiation.
authors.affiliation: ABL-Basic Research Program, National Cancer Institute-Frederick Cancer Research and Development Center, Frederick, MD 21702.
authors.forename: I
authors.initials: I
authors.lastname: Tsarfaty
authors.forename: J H
authors.initials: JH
authors.lastname: Resau
authors.forename: S
authors.initials: S
authors.lastname: Rulong
authors.forename: I
authors.initials: I
authors.lastname: Keydar
authors.forename: D L
authors.initials: DL
authors.lastname: Faletto
authors.forename: G F
authors.initials: GF
authors.lastname: Vande Woude
mesh_terms: D000230:Adenocarcinoma / Q000378:metabolism / Q000473:pathology; D000818:Animals; D001943:Breast Neoplasms / Q000378:metabolism / Q000473:pathology; D002454:Cell Differentiation / Q000235:genetics; D002897:Chromosomes, Human, Pair 7; D003110:Colonic Neoplasms / Q000139:chemically induced / Q000378:metabolism / Q000473:pathology; D004064:Digestive System / Q000378:metabolism; D004305:Dose-Response Relationship, Drug; D006133:Growth Substances / Q000494:pharmacology / Q000502:physiology*; D017228:Hepatocyte Growth Factor; D006801:Humans; D051379:Mice; D008807:Mice, Inbred BALB C; D008856:Microscopy, Fluorescence; D016253:Microscopy, Immunoelectron; D000090063:Proto-Oncogene Mas; D011518:Proto-Oncogene Proteins / Q000502:physiology*; D019859:Proto-Oncogene Proteins c-met
chemical_list: D006133:Growth Substances; C000715470:MAS1 protein, human; D000090063:Proto-Oncogene Mas; D011518:Proto-Oncogene Proteins; D017228:Hepatocyte Growth Factor; D019859:Proto-Oncogene Proteins c-met