title: Membrane dynamics of cleavage furrow closure in Xenopus laevis.
abstract: Epithelial membrane polarity develops early in Xenopus development, with membrane inserted along the earliest cleavage furrows by means of localized exocytosis. The added surface constitutes a new basolateral domain important for early morphogenesis. This basolateral surface becomes isolated from the outside by furrow closure, a zippering of adjacent apical-basolateral margins. Time-lapse microscopy of membrane-labeled embryos revealed two distinct kinds of protrusive activity in furrow closure. Early in furrowing, protrusive activity was associated with purse-string contractility along the apical-basolateral margins. Later in furrow progression, a basolateral protrusive zone developed entirely within the new membrane domain, with long motile filopodia extending in contractile bands from the exposed surfaces. Filopodia interacting with opposing cell surfaces across the cleavage furrow appeared to mediate blastomere-blastomere adhesion, contact spreading and lamellipodial protrusion. Interference with these dynamic activities prevented furrow closure, indicating a basic role for both marginal and basolateral protrusive activities in early embryogenesis.
authors.affiliation: Department of Integrative Biosciences, Oregon Health and Science University, Portland, Oregon 97239-3097, USA. danilchi@ohsu.edu
authors.forename: Michael V
authors.initials: MV
authors.lastname: Danilchik
authors.forename: Elizabeth E
authors.initials: EE
authors.lastname: Brown
mesh_terms: D000199:Actins / Q000378:metabolism*; D000818:Animals; D016764:Cell Polarity; D002970:Cleavage Stage, Ovum / Q000502:physiology* / Q000648:ultrastructure; D004625:Embryo, Nonmammalian; D047108:Embryonic Development; D008855:Microscopy, Electron, Scanning; D029867:Xenopus Proteins / Q000378:metabolism*; D014982:Xenopus laevis / Q000196:embryology*; D020764:cdc42 GTP-Binding Protein / Q000378:metabolism*; D020742:rhoA GTP-Binding Protein / Q000378:metabolism*
chemical_list: D000199:Actins; C504660:Cdc42 effector protein 2, Xenopus; D029867:Xenopus Proteins; D020764:cdc42 GTP-Binding Protein; D020742:rhoA GTP-Binding Protein