title: The role of sphingosine 1-phosphate in migration of osteoclast precursors; an application of intravital two-photon microscopy.
abstract: Sphingosine-1-phosphate (S1P), a biologically active lysophospholipid that is enriched in blood, controls the trafficking of osteoclast precursors between the circulation and bone marrow cavities via G protein-coupled receptors, S1PRs. While S1PR1 mediates chemoattraction toward S1P in bone marrow, where S1P concentration is low, S1PR2 mediates chemorepulsion in blood, where the S1P concentration is high. The regulation of precursor recruitment may represent a novel therapeutic strategy for controlling osteoclast-dependent bone remodeling. Through intravital multiphoton imaging of bone tissues, we reveal that the bidirectional function of S1P temporospatially regulates the migration of osteoclast precursors within intact bone tissues. Imaging technologies have enabled in situ visualization of the behaviors of several players in intact tissues. In addition, intravital microscopy has the potential to be more widely applied to functional analysis and intervention.
authors.affiliation: Laboratory of Biological Imaging, WPI-Immunology Frontier Research Center, Osaka University, Osaka, Japan.
authors.forename: Taeko
authors.initials: T
authors.lastname: Ishii
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Shimazu
authors.forename: Issei
authors.initials: I
authors.lastname: Nishiyama
authors.forename: Junichi
authors.initials: J
authors.lastname: Kikuta
authors.forename: Masaru
authors.initials: M
authors.lastname: Ishii
mesh_terms: D000818:Animals; D002465:Cell Movement / Q000502:physiology*; D008246:Lysophospholipids / Q000502:physiology*; D008853:Microscopy / Q000379:methods; D010010:Osteoclasts / Q000166:cytology*; D017785:Photons; D015398:Signal Transduction; D013110:Sphingosine / Q000031:analogs & derivatives* / Q000502:physiology
chemical_list: D008246:Lysophospholipids; C060506:sphingosine 1-phosphate; D013110:Sphingosine