title: Collective chemotaxis requires contact-dependent cell polarity.
abstract: Directional collective migration is now a widely recognized mode of migration during embryogenesis and cancer. However, how a cluster of cells responds to chemoattractants is not fully understood. Neural crest cells are among the most motile cells in the embryo, and their behavior has been likened to malignant invasion. Here, we show that neural crest cells are collectively attracted toward the chemokine Sdf1. While not involved in initially polarizing cells, Sdf1 directionally stabilizes cell protrusions promoted by cell contact. At this cell contact, N-cadherin inhibits protrusion and Rac1 activity and in turn promotes protrusions and activation of Rac1 at the free edge. These results show a role for N-cadherin during contact inhibition of locomotion, and they reveal a mechanism of chemoattraction likely to function during both embryogenesis and cancer metastasis, whereby attractants such as Sdf1 amplify and stabilize contact-dependent cell polarity, resulting in directional collective migration.
authors.affiliation: Department of Cell and Developmental Biology, University College London, London WC1E 6BT, UK.
authors.forename: Eric
authors.initials: E
authors.lastname: Theveneau
authors.forename: Lorena
authors.initials: L
authors.lastname: Marchant
authors.forename: Sei
authors.initials: S
authors.lastname: Kuriyama
authors.forename: Mazhar
authors.initials: M
authors.lastname: Gull
authors.forename: Barbara
authors.initials: B
authors.lastname: Moepps
authors.forename: Maddy
authors.initials: M
authors.lastname: Parsons
authors.forename: Roberto
authors.initials: R
authors.lastname: Mayor
mesh_terms: D000818:Animals; D030801:Animals, Genetically Modified; D015820:Cadherins / Q000235:genetics / Q000502:physiology; D002448:Cell Adhesion / Q000502:physiology*; D002450:Cell Communication / Q000502:physiology; D016764:Cell Polarity / Q000502:physiology*; D002478:Cells, Cultured; D054377:Chemokine CXCL12 / Q000235:genetics / Q000502:physiology; D002633:Chemotaxis / Q000502:physiology*; D003260:Contact Inhibition / Q000502:physiology; D047108:Embryonic Development / Q000502:physiology; D008954:Models, Biological; D009432:Neural Crest / Q000166:cytology / Q000196:embryology; D019718:Receptors, CXCR4 / Q000235:genetics / Q000502:physiology; D014981:Xenopus / Q000196:embryology / Q000235:genetics / Q000502:physiology; D029867:Xenopus Proteins / Q000235:genetics / Q000502:physiology
chemical_list: C449185:CXCL12 protein, Xenopus; D015820:Cadherins; D054377:Chemokine CXCL12; D019718:Receptors, CXCR4; D029867:Xenopus Proteins