Dermal condensation formation in the chick embryo: Requirement for integrin engagement and subsequent stabilization by a possible Notch/integrin interaction

Authors

  • Frederic Michon,

    1. Centre de Recherche INSERM–Institut Albert Bonniot U823, Ontogenesis and Stem Cell of the Tegument Team, Grenoble, France
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  • Marie Charveron,

    1. Laboratoire de Biologie Cellulaire Cutanée, Institut de Recherche Pierre Fabre, Hôtel Dieu Saint Jacques, Toulouse, France
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  • Danielle Dhouailly

    Corresponding author
    1. Centre de Recherche INSERM–Institut Albert Bonniot U823, Ontogenesis and Stem Cell of the Tegument Team, Grenoble, France
    • Centre de Recherche INSERM–Institut Albert Bonniot U823, Ontogenesis and Stem Cell of the Tegument Team, Domaine de la Merci, Site sante, BP 170, 38042 Grenoble, France
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Abstract

During embryonic development, feathers appear first as primordia consisting of an epidermal placode associated with a dermal condensation. When 7-day chick embryo dorsal skin fragments showing three rows of feather primordia are cultured, they undergo a complete reorganization, which involves the down-regulation of morphogenetic genes and dispersal of dermal fibroblasts, leading to the disappearance of primordia. This loss of organisation is followed by de novo differentiation events. We have used this model to study potential factors involved in the formation of dermal condensations. Activation of Integrins by extracellular Manganese or intracellular Calcium prevents the initial disappearance of the dermal condensations. New primordia formation occurs even after inhibition of the Notch pathway albeit with some fusion between primordia. In conclusion, dermal fibroblast migration requires β1-Integrin whereas the stability of dermal condensations could depend on Notch/Integrin interaction. Developmental Dynamics 236:755–768, 2007. © 2007 Wiley-Liss, Inc.

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