title: Proteinase-activated receptor-1-triggered activation of tumor progression locus-2 promotes actin cytoskeleton reorganization and cell migration.
abstract: Tumor progression locus 2 (Tpl2), a mitogen-activated protein kinase kinase kinase (MAP3K) that is activated by provirus insertion in retrovirus-induced rodent lymphomas and mammary adenocarcinomas, is known to transduce Toll-like receptor, interleukin 1, tumor necrosis factor alpha, and CD40 signals and to play an important role in inflammation. Here we show that Tpl2 is also required for the transduction of cell migration and gene expression signals originating in the G-protein-coupled receptor proteinase-activated receptor 1 (PAR1). PAR1 signals transduced by Tpl2 activate Rac1 and focal adhesion kinase, and they are required for reorganization of the actin cytoskeleton and cell migration. PAR1 expressed in fibroblasts can be triggered by proteinases produced by tumor cells, and PAR1 expressed in tumor cells can be triggered by proteinases produced by fibroblasts. These data suggest that signals that regulate cell migration and gene expression flow between stromal and tumor cells in both directions and that Tpl2 plays a pivotal role in this process.
authors.affiliation: Molecular Oncology Research Institute, Tufts-New England Medical Center, Boston, MA 02111, USA.
authors.forename: Maria
authors.initials: M
authors.lastname: Hatziapostolou
authors.forename: Christos
authors.initials: C
authors.lastname: Polytarchou
authors.forename: Dimitrios
authors.initials: D
authors.lastname: Panutsopulos
authors.forename: Lidija
authors.initials: L
authors.lastname: Covic
authors.forename: Philip N
authors.initials: PN
authors.lastname: Tsichlis
mesh_terms: D000199:Actins / Q000378:metabolism*; D000818:Animals; D002465:Cell Movement / Q000502:physiology*; D003599:Cytoskeleton / Q000378:metabolism; D004789:Enzyme Activation; D048049:Extracellular Signal-Regulated MAP Kinases / Q000378:metabolism; D051416:Focal Adhesion Protein-Tyrosine Kinases / Q000378:metabolism; D006801:Humans; D020930:MAP Kinase Kinase Kinases / Q000378:metabolism*; D020935:MAP Kinase Signaling System; D051379:Mice; D008810:Mice, Inbred C57BL; D041681:NIH 3T3 Cells; D011518:Proto-Oncogene Proteins / Q000378:metabolism*; D044463:Receptor, PAR-1 / Q000378:metabolism*; D013917:Thrombin / Q000494:pharmacology; D020830:rac1 GTP-Binding Protein / Q000378:metabolism; D020741:rho GTP-Binding Proteins / Q000378:metabolism
chemical_list: D000199:Actins; D011518:Proto-Oncogene Proteins; D044463:Receptor, PAR-1; D051416:Focal Adhesion Protein-Tyrosine Kinases; D048049:Extracellular Signal-Regulated MAP Kinases; D020930:MAP Kinase Kinase Kinases; C489843:Map3k8 protein, mouse; D013917:Thrombin; D020830:rac1 GTP-Binding Protein; D020741:rho GTP-Binding Proteins