title: Endocytosis of Hedgehog through dispatched regulates long-range signaling.
abstract: The proteins of the Hedgehog (Hh) family are secreted proteins exerting short- and long-range control over various cell fates in developmental patterning. The Hh gradient in Drosophila wing imaginal discs consists of apical and basolateral secreted pools, but the mechanisms governing the overall establishment of the gradient remain unclear. We investigated the relative contributions of endocytosis and recycling to control the Hh gradient. We show that, upon its initial apical secretion, Hh is re-internalized. We examined the effect of the resistance-nodulation-division transporter Dispatched (Disp) on long-range Hh signaling and unexpectedly found that Disp is specifically required for apical endocytosis of Hh. Re-internalized Hh is then regulated in a Rab5- and Rab4-dependent manner to ensure its long-range activity. We propose that Hh-producing cells integrate endocytosis and recycling as two instrumental mechanisms contributing to regulate the long-range activity of Hh.
authors.affiliation: Institut de Biologie de Valrose - iBV, Centre de Biochimie, Université Nice Sophia Antipolis, CNRS UMR7277, INSERM 1091, Parc Valrose, 06108 Nice Cedex 2, France. Electronic address: dangelo@unice.fr.
authors.forename: Gisela
authors.initials: G
authors.lastname: D'Angelo
authors.affiliation: Institut de Biologie de Valrose - iBV, Centre de Biochimie, Université Nice Sophia Antipolis, CNRS UMR7277, INSERM 1091, Parc Valrose, 06108 Nice Cedex 2, France.
authors.forename: Tamás
authors.initials: T
authors.lastname: Matusek
authors.affiliation: Institut de Biologie de Valrose - iBV, Centre de Biochimie, Université Nice Sophia Antipolis, CNRS UMR7277, INSERM 1091, Parc Valrose, 06108 Nice Cedex 2, France.
authors.forename: Sandrine
authors.initials: S
authors.lastname: Pizette
authors.affiliation: Institut de Biologie de Valrose - iBV, Centre de Biochimie, Université Nice Sophia Antipolis, CNRS UMR7277, INSERM 1091, Parc Valrose, 06108 Nice Cedex 2, France. Electronic address: therond@unice.fr.
authors.forename: Pascal P
authors.initials: PP
authors.lastname: Thérond
mesh_terms: D000818:Animals; D029721:Drosophila Proteins / Q000378:metabolism*; D004331:Drosophila melanogaster / Q000378:metabolism*; D004705:Endocytosis / Q000502:physiology*; D018507:Gene Expression Regulation, Developmental / Q000502:physiology; D053823:Hedgehog Proteins / Q000378:metabolism*; D053858:Metabolic Networks and Pathways / Q000502:physiology; D015398:Signal Transduction / Q000502:physiology; D014921:Wings, Animal / Q000378:metabolism*; D020695:rab4 GTP-Binding Proteins / Q000378:metabolism*; D020696:rab5 GTP-Binding Proteins / Q000378:metabolism*
chemical_list: D029721:Drosophila Proteins; D053823:Hedgehog Proteins; C077245:hh protein, Drosophila; C586289:Rab5 protein, Drosophila; D020695:rab4 GTP-Binding Proteins; D020696:rab5 GTP-Binding Proteins