title: Possible involvement of the vascular endothelial growth factor-Flt-1-focal adhesion kinase pathway in chemotaxis and the cell proliferation of osteoclast precursor cells in arthritic joints.
abstract: Vascular endothelial growth factor (VEGF) plays a crucial role in the pathogenesis of inflammatory joint disease, including angiogenesis and synovitis. Rheumatoid arthritis is a chronic inflammatory disease characterized by progressive synovitis and subsequent bone destruction mediated by osteoclasts (OCs). In this study, we investigate the effects of VEGF on OC precursor cells (pOCs) using Raw cells and adjuvant-induced arthritis in rats. OCs and pOCs in the arthritic joints express VEGF and VEGF receptor type I (Flt-1). Raw cells also express Flt-1, and VEGF treatment stimulated chemotaxis, cell proliferation, the association of Flt-1 with focal adhesion kinase (FAK), and the tyrosine phosphorylation of FAK in Raw cells. The tyrosine phosphorylation of FAK was also observed in pOCs in the arthritic joints of adjuvant-induced arthritis. Adenovirus-mediated expression of FAK-related nonkinase in Raw cells inhibited the effects of VEGF in a dominant negative manner. Furthermore, intra-articular injection of the FAK-related nonkinase virus suppressed the recruitment of pOCs and bone destruction. Our results suggest the possible involvement of the VEGF-Flt-1-FAK pathway in inflammatory disease-induced joint destruction.
authors.affiliation: Department of Orthopedic Surgery, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan.
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Matsumoto
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Tanaka
authors.forename: Go
authors.initials: G
authors.lastname: Hirata
authors.forename: Masuo
authors.initials: M
authors.lastname: Hanada
authors.forename: Shuichi
authors.initials: S
authors.lastname: Matsuda
authors.forename: Toshihide
authors.initials: T
authors.lastname: Shuto
authors.forename: Yukihide
authors.initials: Y
authors.lastname: Iwamoto
mesh_terms: D000818:Animals; D001168:Arthritis / Q000473:pathology*; D002455:Cell Division; D002460:Cell Line; D002633:Chemotaxis; D016228:Endothelial Growth Factors / Q000032:analysis / Q000494:pharmacology*; D016326:Extracellular Matrix Proteins / Q000032:analysis / Q000502:physiology*; D051417:Focal Adhesion Kinase 1; D051416:Focal Adhesion Protein-Tyrosine Kinases; D007596:Joints / Q000473:pathology*; D008222:Lymphokines / Q000032:analysis / Q000494:pharmacology*; D051379:Mice; D020928:Mitogen-Activated Protein Kinases / Q000502:physiology; D018995:Myosin Heavy Chains; D024501:Nonmuscle Myosin Type IIB; D010010:Osteoclasts / Q000502:physiology*; D019869:Phosphatidylinositol 3-Kinases / Q000502:physiology; D010766:Phosphorylation; D011505:Protein-Tyrosine Kinases / Q000502:physiology*; D020794:Receptor Protein-Tyrosine Kinases / Q000032:analysis / Q000502:physiology; D017978:Receptors, Growth Factor / Q000032:analysis / Q000502:physiology; D040262:Receptors, Vascular Endothelial Growth Factor; D013234:Stem Cells / Q000502:physiology*; D014443:Tyrosine / Q000378:metabolism; D042461:Vascular Endothelial Growth Factor A; D040281:Vascular Endothelial Growth Factor Receptor-1; D042442:Vascular Endothelial Growth Factors
chemical_list: D016228:Endothelial Growth Factors; D016326:Extracellular Matrix Proteins; D008222:Lymphokines; D017978:Receptors, Growth Factor; D042461:Vascular Endothelial Growth Factor A; D042442:Vascular Endothelial Growth Factors; D014443:Tyrosine; D019869:Phosphatidylinositol 3-Kinases; C501163:Flt1 protein, mouse; D011505:Protein-Tyrosine Kinases; D020794:Receptor Protein-Tyrosine Kinases; D040262:Receptors, Vascular Endothelial Growth Factor; D040281:Vascular Endothelial Growth Factor Receptor-1; D051417:Focal Adhesion Kinase 1; D051416:Focal Adhesion Protein-Tyrosine Kinases; C496051:Ptk2 protein, mouse; D020928:Mitogen-Activated Protein Kinases; D024501:Nonmuscle Myosin Type IIB; C103815:nonmuscle myosin type IIB heavy chain; D018995:Myosin Heavy Chains