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Autocrine motility factor signals integrin-mediated metastatic melanoma cell adhesion and invasion. 1996

J Timar, and M Trikha, and K Szekeres, and R Bazaz, and J Tovari, and S Silletti, and A Raz, and K V Honn
First Institute of Pathology and Experimental Cancer Research, Semmelweis University of Medicine, Budapest, Hungary.

The binding of autocrine motility factor (AMF) to its cell surface receptor, gp78, stimulates tumor cell motility. In this report, we provide evidence that stimulation of gp78 by either AMF or a monoclonal antibody to gp78 (3F3A) increases adhesion and spreading of metastatic murine melanoma (B16a) cells on fibronectin. This gp78-regulated increase is mediated by up-regulation of surface alphaIIbbeta3++ and alpha5beta1 integrin receptors. In addition, AMF treatment of B16a cells increased translocation of alphaIIbbeta3 and alpha5beta1 from the cytoplasm to the cell surface. However, alphaIIbbeta3 and alpha5beta1 demonstrate separate and unique staining patterns at the surface of B16a cells in response to stimulation of gp78. Furthermore, stimulation of B16a cells with AMF increased their invasion through Matrigel. This stimulated invasion was inhibited by antibodies to alphaIIbbeta3 but not by antibodies to alpha5beta1. The increased integrin surface expression and function in response to AMF was blocked by N-benzyl-N-hydroxy-5-phenylpentanamide, an inhibitor of 12-lipoxygenase, and calphostin C, an inhibitor of protein kinase C. The results demonstrate that AMF stimulates integrin-mediated B16a cell adhesion, spreading, and invasion, and these events are regulated by a signaling pathway involving 12-lipoxygenases and protein kinase C.

UI MeSH Term Description Entries
D007797 Laminin Large, noncollagenous glycoprotein with antigenic properties. It is localized in the basement membrane lamina lucida and functions to bind epithelial cells to the basement membrane. Evidence suggests that the protein plays a role in tumor invasion. Merosin,Glycoprotein GP-2,Laminin M,Laminin M Chain,Chain, Laminin M,Glycoprotein GP 2,M Chain, Laminin
D008546 Melanoma, Experimental Experimentally induced tumor that produces MELANIN in animals to provide a model for studying human MELANOMA. B16 Melanoma,Melanoma, B16,Melanoma, Cloudman S91,Melanoma, Harding-Passey,Experimental Melanoma,Experimental Melanomas,Harding Passey Melanoma,Melanomas, Experimental,B16 Melanomas,Cloudman S91 Melanoma,Harding-Passey Melanoma,Melanoma, Harding Passey,Melanomas, B16,S91 Melanoma, Cloudman
D008954 Models, Biological Theoretical representations that simulate the behavior or activity of biological processes or diseases. For disease models in living animals, DISEASE MODELS, ANIMAL is available. Biological models include the use of mathematical equations, computers, and other electronic equipment. Biological Model,Biological Models,Model, Biological,Models, Biologic,Biologic Model,Biologic Models,Model, Biologic
D009361 Neoplasm Invasiveness Ability of neoplasms to infiltrate and actively destroy surrounding tissue. Invasiveness, Neoplasm,Neoplasm Invasion,Invasion, Neoplasm
D009362 Neoplasm Metastasis The transfer of a neoplasm from one organ or part of the body to another remote from the primary site. Metastase,Metastasis,Metastases, Neoplasm,Metastasis, Neoplasm,Neoplasm Metastases,Metastases
D011509 Proteoglycans Glycoproteins which have a very high polysaccharide content. Proteoglycan,Proteoglycan Type H
D002448 Cell Adhesion Adherence of cells to surfaces or to other cells. Adhesion, Cell,Adhesions, Cell,Cell Adhesions
D002460 Cell Line Established cell cultures that have the potential to propagate indefinitely. Cell Lines,Line, Cell,Lines, Cell
D002462 Cell Membrane The lipid- and protein-containing, selectively permeable membrane that surrounds the cytoplasm in prokaryotic and eukaryotic cells. Plasma Membrane,Cytoplasmic Membrane,Cell Membranes,Cytoplasmic Membranes,Membrane, Cell,Membrane, Cytoplasmic,Membrane, Plasma,Membranes, Cell,Membranes, Cytoplasmic,Membranes, Plasma,Plasma Membranes
D003094 Collagen A polypeptide substance comprising about one third of the total protein in mammalian organisms. It is the main constituent of SKIN; CONNECTIVE TISSUE; and the organic substance of bones (BONE AND BONES) and teeth (TOOTH). Avicon,Avitene,Collagen Felt,Collagen Fleece,Collagenfleece,Collastat,Dermodress,Microfibril Collagen Hemostat,Pangen,Zyderm,alpha-Collagen,Collagen Hemostat, Microfibril,alpha Collagen

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