title: Integrin alphavbeta3 regulates microfibril assembly in human periodontal ligament cells.
abstract: Fibrillin-1 is the major structural component of extracellular microfibrils. However, the mechanism by which extracellular fibrillin-1 assembles into microfibrils is not fully understood. Fibrillin-1 contains the Arg-Gly-Asp (RGD) motif, which may allow binding to RGD-recognizing integrins. We hypothesized that integrin alphavbeta3 on the cell surface of human periodontal ligament (PDL) fibroblasts may influence fibrillin-1 assembly into cell/matrix layers. We treated PDL fibroblasts with an integrin alphavbeta3-specific antagonist to examine fibrillin-1 assembly. Western blotting and immunofluorescence analysis showed that treatment with the integrin alphavbeta3 antagonist at 5 muM clearly abolished fibrillin-1 deposition. These results provide for the first time evidence that integrin alphavbeta3 regulates extracellular assembly of fibrillin-1, thereby modulating cell-mediated homeostasis of microfibrils.
authors.affiliation: Section of Functional Structure, Department of Morphological Biology, Division of Biomedical Sciences, Fukuoka Dental College, 2-15-1 Tamura, Sawara-ku, Fukuoka 814-0193, Japan. tsuru@college.fdcnet.ac.jp
authors.forename: E
authors.initials: E
authors.lastname: Tsuruga
authors.forename: A
authors.initials: A
authors.lastname: Sato
authors.forename: T
authors.initials: T
authors.lastname: Ueki
authors.forename: K
authors.initials: K
authors.lastname: Nakashima
authors.forename: Y
authors.initials: Y
authors.lastname: Nakatomi
authors.forename: H
authors.initials: H
authors.lastname: Ishikawa
authors.forename: T
authors.initials: T
authors.lastname: Yajima
authors.forename: Y
authors.initials: Y
authors.lastname: Sawa
mesh_terms: D000293:Adolescent; D020816:Amino Acid Motifs; D000595:Amino Acid Sequence; D002478:Cells, Cultured; D000071838:Fibrillin-1; D000071837:Fibrillins; D005347:Fibroblasts / Q000166:cytology / Q000187:drug effects / Q000378:metabolism*; D006801:Humans; D039302:Integrin alphaVbeta3 / Q000037:antagonists & inhibitors / Q000378:metabolism*; D020894:Microfibrils / Q000737:chemistry / Q000378:metabolism*; D008840:Microfilament Proteins / Q000737:chemistry / Q000378:metabolism; D009842:Oligopeptides; D010513:Periodontal Ligament / Q000166:cytology* / Q000378:metabolism*; D055815:Young Adult; D054392:Adipokines
chemical_list: D000071838:Fibrillin-1; D000071837:Fibrillins; D039302:Integrin alphaVbeta3; D008840:Microfilament Proteins; D009842:Oligopeptides; C000605722:FBN1 protein, human; D054392:Adipokines; C047981:arginyl-glycyl-aspartic acid