title: CD40 induces human multiple myeloma cell migration via phosphatidylinositol 3-kinase/AKT/NF-kappa B signaling.
abstract: Multiple myeloma (MM) is characterized by clonal expansion of malignant plasma cells in the bone marrow and their egress into peripheral blood with progression to plasma cell leukemia. Our previous study defined a functional role of CD40 activation in MM cell homing and migration. In this study, we examine signaling events mediating CD40-induced MM cell migration. We show that cross-linking CD40, using either soluble CD40L (sCD40L) or anti-CD40 monoclonal antibody (mAb), induces phosphatidylinositol 3-kinase (PI3K) activity and activates its downstream effector AKT in MM.1S cells. CD40 activation also activates the MAP kinase (MEK) pathway, evidenced by phosphorylation of extracellular signal-regulated mitogen-activated protein kinase (ERK), but not c-jun amino-terminal kinase (JNK) or p38, in a dose- and time-dependent manner. Using pharmacologic inhibitors of PI3K and MEK, as well as adenoviruses expressing dominant-negative and constitutively expressed AKT, we demonstrate that PI3K and AKT activities are required for CD40-induced MM cell migration. In contrast, inhibition of ERK/MEK phosphorylation only partially (10%-15%) prevents migration, suggesting only a minor role in regulation of CD40-mediated MM migration. We further demonstrate that CD40 induces nuclear factor (NF)-kappa B activation as a downstream target of PI3K/AKT signaling, and that inhibition of NF-kappa B signaling using specific inhibitors PS1145 and SN50 completely abrogates CD40-induced MM migration. Finally, we demonstrate that urokinase plasminogen activator (uPA), an NF-kappa B target gene, is induced by CD40; and conversely, that uPA induction via CD40 is blocked by PI3K and NF-kappa B inhibitors. Our data therefore indicate that CD40-induced MM cell migration is primarily mediated via activation of PI3K/AKT/NF-kappa B signaling, and further suggest that novel therapies targeting this pathway may inhibit MM cell migration associated with progressive MM.
authors.affiliation: Jerome Lipper Multiple Myeloma Center, Department of Adult Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA 02115, USA.
authors.forename: Yu-Tzu
authors.initials: YT
authors.lastname: Tai
authors.forename: Klaus
authors.initials: K
authors.lastname: Podar
authors.forename: Nicholas
authors.initials: N
authors.lastname: Mitsiades
authors.forename: Boris
authors.initials: B
authors.lastname: Lin
authors.forename: Constantine
authors.initials: C
authors.lastname: Mitsiades
authors.forename: Deepak
authors.initials: D
authors.lastname: Gupta
authors.forename: Masaharu
authors.initials: M
authors.lastname: Akiyama
authors.forename: Laurence
authors.initials: L
authors.lastname: Catley
authors.forename: Teru
authors.initials: T
authors.lastname: Hideshima
authors.forename: Nikhil C
authors.initials: NC
authors.lastname: Munshi
authors.forename: Steven P
authors.initials: SP
authors.lastname: Treon
authors.forename: Kenneth C
authors.initials: KC
authors.lastname: Anderson
mesh_terms: D019013:CD40 Antigens / Q000378:metabolism / Q000502:physiology*; D002465:Cell Movement; D006801:Humans; D008024:Ligands; D020928:Mitogen-Activated Protein Kinases / Q000378:metabolism; D009101:Multiple Myeloma / Q000473:pathology*; D016328:NF-kappa B / Q000378:metabolism*; D019869:Phosphatidylinositol 3-Kinases / Q000378:metabolism*; D010766:Phosphorylation; D017346:Protein Serine-Threonine Kinases; D011518:Proto-Oncogene Proteins / Q000378:metabolism*; D051057:Proto-Oncogene Proteins c-akt; D015398:Signal Transduction; D014407:Tumor Cells, Cultured; D014568:Urokinase-Type Plasminogen Activator / Q000378:metabolism
chemical_list: D019013:CD40 Antigens; D008024:Ligands; D020928:Mitogen-Activated Protein Kinases; D016328:NF-kappa B; D019869:Phosphatidylinositol 3-Kinases; D017346:Protein Serine-Threonine Kinases; D011518:Proto-Oncogene Proteins; D051057:Proto-Oncogene Proteins c-akt; D014568:Urokinase-Type Plasminogen Activator; C494918:AKT1 protein, human