title: Integrin alpha5beta1 supports the migration of Xenopus cranial neural crest on fibronectin.
abstract: During early embryonic development, cranial neural crest cells emerge from the developing mid- and hindbrain. While numerous studies have focused on integrin involvement in trunk neural crest cell migration, comparatively little is known about mechanisms of cranial neural crest cell migration. We show that fibronectin, but not laminin, vitronectin, or type I collagen can support cranial neural crest cell migration and segmentation in vitro. These behaviors require both the RGD and "synergy" sites located within the central cell-binding domain of fibronectin. While these two sites are sufficient for cranial neural crest cell migration, we find that the second Heparin-binding domain of fibronectin can provide additional support for cranial neural crest cell migration in vitro. Finally, using a function blocking monoclonal antibody, we show that cranial neural crest cell migration on fibronectin requires the integrin alpha5beta1.
authors.affiliation: Department of Cell Biology, University of Virginia Health Sciences System, Box 800732, School of Medicine, Charlottesville, VA 22908, USA. da3s@virginia.edu
authors.forename: Dominique
authors.initials: D
authors.lastname: Alfandari
authors.forename: Hélène
authors.initials: H
authors.lastname: Cousin
authors.forename: Alban
authors.initials: A
authors.lastname: Gaultier
authors.forename: Benjamin G
authors.initials: BG
authors.lastname: Hoffstrom
authors.forename: Douglas W
authors.initials: DW
authors.lastname: DeSimone
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000494:pharmacology; D001665:Binding Sites; D002465:Cell Movement / Q000187:drug effects / Q000502:physiology*; D024042:Collagen Type I / Q000378:metabolism; D004625:Embryo, Nonmammalian; D005353:Fibronectins / Q000235:genetics / Q000378:metabolism*; D006257:Head / Q000196:embryology; D006493:Heparin / Q000378:metabolism; D039081:Integrin alpha5beta1 / Q000276:immunology / Q000378:metabolism*; D007797:Laminin / Q000378:metabolism; D009432:Neural Crest / Q000166:cytology* / Q000187:drug effects / Q000378:metabolism*; D009842:Oligopeptides / Q000378:metabolism; D017434:Protein Structure, Tertiary; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D019096:Vitronectin / Q000378:metabolism; D029867:Xenopus Proteins / Q000276:immunology / Q000378:metabolism; D014982:Xenopus laevis / Q000196:embryology*
chemical_list: D000911:Antibodies, Monoclonal; D024042:Collagen Type I; D005353:Fibronectins; D039081:Integrin alpha5beta1; D007797:Laminin; D009842:Oligopeptides; D011993:Recombinant Fusion Proteins; D019096:Vitronectin; D029867:Xenopus Proteins; C047981:arginyl-glycyl-aspartic acid; D006493:Heparin