title: Stromal cell-derived factor-1/CXCR4 enhanced motility of human osteosarcoma cells involves MEK1/2, ERK and NF-kappaB-dependent pathways.
abstract: Osteosarcoma is characterized by a high malignant and metastatic potential. The chemokine stromal-derived factor-1alpha (SDF-1alpha) and its receptor, CXCR4, play a crucial role in adhesion and migration of human cancer cells. Integrins are the major adhesive molecules in mammalian cells, and has been associated with metastasis of cancer cells. Here, we found that human osteosarcoma cell lines had significant expression of SDF-1 and CXCR4 (SDF-1 receptor). Treatment of osteosarcoma cells with SDF-1alpha increased the migration and cell surface expression of alphavbeta3 integrin. CXCR4-neutralizing antibody, CXCR4 specific inhibitor (AMD3100) or small interfering RNA against CXCR4 inhibited the SDF-1alpha-induced increase the migration and integrin expression of osteosarcoma cells. Pretreated of osteosarcoma cells with MAPK kinase (MEK) inhibitor PD98059 inhibited the SDF-1alpha-mediated migration and integrin expression. Stimulation of cells with SDF-1alpha increased the phosphorylation of MEK and extracellular signal-regulating kinase (ERK). In addition, NF-kappaB inhibitor (PDTC) or IkappaB protease inhibitor (TPCK) also inhibited SDF-1alpha-mediated cell migration and integrin up-regulation. Stimulation of cells with SDF-1alpha induced IkappaB kinase (IKKalpha/beta) phosphorylation, IkappaB phosphorylation, p65 Ser(536) phosphorylation, and kappaB-luciferase activity. Furthermore, the SDF-1alpha-mediated increasing kappaB-luciferase activity was inhibited by AMD3100, PD98059, PDTC and TPCK or MEK1, ERK2, IKKalpha and IKKbeta mutants. Taken together, these results suggest that the SDF-1alpha acts through CXCR4 to activate MEK and ERK, which in turn activates IKKalpha/beta and NF-kappaB, resulting in the activations of alphavbeta3 integrins and contributing the migration of human osteosarcoma cells.
authors.affiliation: Department of Orthopaedic Surgery, China Medical University Beigang Hospital, Yun-Lin County, Taiwan.
authors.forename: Chun-Yin
authors.initials: CY
authors.lastname: Huang
authors.forename: Chun-Yi
authors.initials: CY
authors.lastname: Lee
authors.forename: Meng-Yi
authors.initials: MY
authors.lastname: Chen
authors.forename: Wei-Hung
authors.initials: WH
authors.lastname: Yang
authors.forename: Ying-Hao
authors.initials: YH
authors.lastname: Chen
authors.forename: Chia-Hao
authors.initials: CH
authors.lastname: Chang
authors.forename: Horng-Chaung
authors.initials: HC
authors.lastname: Hsu
authors.forename: Yi-Chin
authors.initials: YC
authors.lastname: Fong
authors.forename: Chih-Hsin
authors.initials: CH
authors.lastname: Tang
mesh_terms: D000818:Animals; D045744:Cell Line, Tumor; D002465:Cell Movement / Q000187:drug effects; D054377:Chemokine CXCL12 / Q000378:metabolism*; D048049:Extracellular Signal-Regulated MAP Kinases / Q000037:antagonists & inhibitors / Q000378:metabolism; D006801:Humans; D016023:Integrins / Q000378:metabolism; D020935:MAP Kinase Signaling System / Q000187:drug effects; D051379:Mice; D020929:Mitogen-Activated Protein Kinase Kinases / Q000037:antagonists & inhibitors / Q000378:metabolism; D016328:NF-kappa B / Q000378:metabolism*; D012516:Osteosarcoma / Q000201:enzymology* / Q000473:pathology*; D047428:Protein Kinase Inhibitors / Q000494:pharmacology; D019718:Receptors, CXCR4 / Q000378:metabolism*; D015854:Up-Regulation / Q000187:drug effects
chemical_list: D054377:Chemokine CXCL12; D016023:Integrins; D016328:NF-kappa B; D047428:Protein Kinase Inhibitors; D019718:Receptors, CXCR4; D048049:Extracellular Signal-Regulated MAP Kinases; D020929:Mitogen-Activated Protein Kinase Kinases