title: EGF receptor signaling regulates pulses of cell delamination from the Drosophila ectoderm.
abstract: Many different intercellular signaling pathways are known but, for most, it is unclear whether they can generate oscillating cell behaviors. Here we use time-lapse analysis of Drosophila embryogenesis to show that oenocytes delaminate from the ectoderm in discrete bursts of three. This pulsatile process has a 1 hour period, occurs without cell division, and requires a localized EGF receptor (EGFR) response. High-threshold EGFR targets are sequentially activated in rings of three cells, prefiguring the temporal pattern of delamination. Surprisingly, widespread misexpression of the relevant activating ligand, Spitz, is compatible with robust delamination pulses. Moreover, although Spitz ligand becomes limiting after only two pulses, artificially prolonging its secretion generates up to six additional cycles, revealing a rhythmic underlying mechanism. These findings illustrate how intercellular signaling and cell movements can generate multiple cycles of a cell behavior, despite individual cells experiencing only one cycle of receptor activation.
authors.affiliation: Medical Research Council, National Institute for Medical Research, The Ridgeway, Mill Hill, London NW7 1AA, United Kingdom.
authors.forename: Véronique
authors.initials: V
authors.lastname: Brodu
authors.forename: Philip R
authors.initials: PR
authors.lastname: Elstob
authors.forename: Alex P
authors.initials: AP
authors.lastname: Gould
mesh_terms: D000818:Animals; D002455:Cell Division; D004330:Drosophila / Q000196:embryology*; D029721:Drosophila Proteins / Q000378:metabolism; D004475:Ectoderm / Q000378:metabolism*; D004815:Epidermal Growth Factor / Q000378:metabolism; D066246:ErbB Receptors / Q000378:metabolism*; D005136:Eye Proteins / Q000378:metabolism; D007150:Immunohistochemistry; D034882:Lamins / Q000378:metabolism; D008024:Ligands; D008565:Membrane Proteins / Q000378:metabolism; D018613:Microscopy, Confocal; D008856:Microscopy, Fluorescence; D008954:Models, Biological; D009419:Nerve Tissue Proteins / Q000378:metabolism; D017434:Protein Structure, Tertiary; D051880:Receptors, Notch; D015398:Signal Transduction; D013997:Time Factors
chemical_list: D029721:Drosophila Proteins; D005136:Eye Proteins; D034882:Lamins; D008024:Ligands; D008565:Membrane Proteins; C497759:N protein, Drosophila; D009419:Nerve Tissue Proteins; D051880:Receptors, Notch; C081481:Rho protein, Drosophila; C075638:aos protein, Drosophila; C076026:spi protein, Drosophila; D004815:Epidermal Growth Factor; D066246:ErbB Receptors