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<dc:title xml:lang="fr">Remodelage des jonctions sous stress mécanique</dc:title>
<dcterms:alternative xml:lang="en">Junction remodeling under mechanical forces</dcterms:alternative>
<dc:subject xml:lang="fr">C. elegans</dc:subject>
<dc:subject xml:lang="fr">Morphogenèse</dc:subject>
<dc:subject xml:lang="fr">L'allongement polarisé</dc:subject>
<dc:subject xml:lang="fr">Jonctions adhérentes</dc:subject>
<dc:subject xml:lang="fr">L'activation musculaire</dc:subject>
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<dc:subject xml:lang="en">C. elegans</dc:subject>
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<dc:subject xml:lang="en">Polarized elongation</dc:subject>
<dc:subject xml:lang="en">Adherens junctions</dc:subject>
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<dcterms:abstract xml:lang="fr">Les changements de forme des cellules épithéliales sont cruciaux pour la morphogenèse embryonnaire. Chez les embryons de C. elegans, l'activité musculaire sous les cellules épidermiques est l'une des deux forces mécaniques qui dirigent ce processus. Cependant, les mécanismes moléculaires détaillés à travers lesquels l'activité musculaire favorise l'allongement polarisé le long de l'axe antérieur / postérieur (A / P) restent à être totalement compris. Ici, en utilisant l'imagerie rapide-3D, on découvre que les embryons tournent après l'activation musculaire et on décrit le schéma local et global de la rotation de l'embryon induite par activité musculaire. En outre, on a observé que les muscles des côtés opposés de l'embryon se contractent alternativement, expliquant les rotations de l'embryon. Par conséquent, les jonctions adhérentes sont étirées le long de la direction A / P pendant les rotations de l'embryon et sont donc sous une tension plus élevée. Nos résultats préliminaires d'imagerie en molécule unique ont montré que plus de E-cadhérine, matériau de jonction, fusionne avec des jonctions orientées A / P quand il y a une tension élevée sur ces jonctions.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Epithelial cell shape changes is essential for embryonic morphogenesis. In C. elegans embryos, muscle activity from underneath epidermal cells is one of the two mechanical force inputs driving this process. However, the detailed molecular mechanisms through which muscle activity promotes the polarized elongation along the anterior/posterior (A/P) axis remains to be fully understood. Here, using fast-3D imaging, we discover that embryos rotate after muscle activation and we describe the local and global pattern of embryo rotation induced by muscle activity. Furthermore, we observed that muscles located on opposite sides of the embryo mostly contract alternatively, accounting for embryo rotations. As a consequence, adherens junctions get stretched along the A/P direction during embryo rotations and therefore are under higher tension. Our preliminary results from single molecule imaging showed that more junction material E-cadherin fuses with A/P oriented junctions when there is high tension on these junctions.</dcterms:abstract>
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