title: mda-9/Syntenin promotes metastasis in human melanoma cells by activating c-Src.
abstract: The scaffold PDZ-domain containing protein mda-9/syntenin functions as a positive regulator of cancer cell progression in human melanoma and other tumors. mda-9/Syntenin regulates cell motility and invasion by altering defined biochemical and signaling pathways, including focal adhesion kinase (FAK), p38 mitogen-activated protein kinase (MAPK) and NF-kappaB, but precisely how mda-9/syntenin organizes these multiprotein signaling complexes is not well understood. Using a clinically relevant human melanoma model, we demonstrate that mda-9/syntenin physically interacts with c-Src and this communication correlates with an increase in FAK/c-Src complex formation and c-Src activation. Inhibiting mda-9/syntenin, using an adenovirus expressing antisense mda-9/syntenin or addition of c-Src siRNA, suppresses melanoma cell migration, anchorage-independent growth, and spontaneous tumor cell dissemination in vivo in a human melanoma animal metastasis model. These data are compatible with a model wherein interaction of MDA-9/syntenin with c-Src promotes the formation of an active FAK/c-Src signaling complex, leading to enhanced tumor cell invasion and metastatic spread. These provocative findings highlight mda-9/syntenin and its interacting partners as promising therapeutic targets for intervention of metastasis.
authors.affiliation: Department of Human and Molecular Genetics, Virginia Commonwealth University, School of Medicine, Richmond, VA 23298, USA.
authors.forename: Habib
authors.initials: H
authors.lastname: Boukerche
authors.forename: Zao-zhong
authors.initials: ZZ
authors.lastname: Su
authors.forename: Célia
authors.initials: C
authors.lastname: Prévot
authors.forename: Devanand
authors.initials: D
authors.lastname: Sarkar
authors.forename: Paul B
authors.initials: PB
authors.lastname: Fisher
mesh_terms: D000818:Animals; D000081247:CSK Tyrosine-Protein Kinase; D045744:Cell Line, Tumor; D002465:Cell Movement; D049109:Cell Proliferation; D004789:Enzyme Activation; D051416:Focal Adhesion Protein-Tyrosine Kinases / Q000378:metabolism; D006801:Humans; D008546:Melanoma, Experimental / Q000473:pathology*; D009362:Neoplasm Metastasis / Q000473:pathology*; D011485:Protein Binding; D011505:Protein-Tyrosine Kinases / Q000378:metabolism*; D051381:Rats; D017208:Rats, Wistar; D053676:Syntenins / Q000378:metabolism / Q000502:physiology*; D019061:src-Family Kinases
chemical_list: C109621:SDCBP protein, human; D053676:Syntenins; D011505:Protein-Tyrosine Kinases; D000081247:CSK Tyrosine-Protein Kinase; D051416:Focal Adhesion Protein-Tyrosine Kinases; D019061:src-Family Kinases; C000631346:CSK protein, human