title: Domain-specific function of ShcC docking protein in neuroblastoma cells.
abstract: ShcC is a family member of the Shc docking proteins that possess two different phosphotyrosine-binding motifs and conduct signals as Grb2-binding substrates of various receptor tyrosine kinases. We have recently shown that some neuroblastoma cell lines, such as NB-39-nu cells, express a protein complex of hyperphosphorylated ShcC and anaplastic lymphoma kinase (ALK), which is self-activated by gene amplification. Here, we demonstrate that the expression of a mutant ShcC lacking Grb2-binding sites, 3YF-ShcC, significantly impaired the survival, differentiation and motility of NB-39-nu cells by blocking the ERK and Akt pathways. On the other hand, cells overexpressing ShcC or 3YF-ShcC, but not a mutant ShcC that lacks SH2, showed decreased anchorage independency and in vivo tumorigenicity, suggesting a novel ShcC-specific suppressive effect through its SH2 domain on cell transformation. Notably, overexpression of ShcC suppressed the sustained phosphorylation of Src family kinase after cell detachment, which might be independent of phosphorylation of Grb2-binding site. It was indicated that the Src/Fyn-Cas pathway is modulated as a target of these suppressive effects by ShcC. Reciprocal change of ShcC expression and phosphorylation observed in malignant neuroblastoma cell lines might be explained by these phosphotyrosine-dependent and -independent functions of ShcC.
authors.affiliation: Growth Factor Division, National Cancer Center Research Institute, 5-1-1 Tsukiji, Chuo-ku, Tokyo 104-0045, Japan.
authors.forename: Izumi
authors.initials: I
authors.lastname: Miyake
authors.forename: Yuko
authors.initials: Y
authors.lastname: Hakomori
authors.forename: Yoko
authors.initials: Y
authors.lastname: Misu
authors.forename: Hisaya
authors.initials: H
authors.lastname: Nakadate
authors.forename: Nobuo
authors.initials: N
authors.lastname: Matsuura
authors.forename: Michiie
authors.initials: M
authors.lastname: Sakamoto
authors.forename: Ryuichi
authors.initials: R
authors.lastname: Sakai
mesh_terms: D000362:Agar / Q000737:chemistry; D000818:Animals; D017209:Apoptosis; D002448:Cell Adhesion; D002454:Cell Differentiation; D045744:Cell Line, Tumor; D002465:Cell Movement; D049109:Cell Proliferation; D005799:Genes, Dominant; D006801:Humans; D015151:Immunoblotting; D007150:Immunohistochemistry; D020287:In Situ Nick-End Labeling; D051379:Mice; D008819:Mice, Nude; D019950:Mitogen-Activated Protein Kinase 1 / Q000378:metabolism; D048052:Mitogen-Activated Protein Kinase 3 / Q000378:metabolism; D009154:Mutation; D009361:Neoplasm Invasiveness; D009368:Neoplasm Transplantation; D009447:Neuroblastoma / Q000378:metabolism*; D009479:Neuropeptides / Q000378:metabolism / Q000502:physiology*; D010766:Phosphorylation; D019000:Phosphotyrosine / Q000737:chemistry; D010957:Plasmids / Q000378:metabolism; D011485:Protein Binding; D017434:Protein Structure, Tertiary; D055765:Shc Signaling Adaptor Proteins; D000071427:Src Homology 2 Domain-Containing, Transforming Protein 3; D013936:Thymidine / Q000737:chemistry; D013997:Time Factors; D014162:Transfection; D014212:Tretinoin / Q000378:metabolism; D014945:Wound Healing; D018909:src Homology Domains
chemical_list: D009479:Neuropeptides; C122029:SHC3 protein, human; D055765:Shc Signaling Adaptor Proteins; D000071427:Src Homology 2 Domain-Containing, Transforming Protein 3; D019000:Phosphotyrosine; D014212:Tretinoin; D000362:Agar; D019950:Mitogen-Activated Protein Kinase 1; D048052:Mitogen-Activated Protein Kinase 3; D013936:Thymidine