title: A macrophage relay for long-distance signaling during postembryonic tissue remodeling.
abstract: Macrophages have diverse functions in immunity as well as in development and homeostasis. We identified a function for these cells in long-distance communication during postembryonic tissue remodeling. Ablation of macrophages in zebrafish prevented melanophores from coalescing into adult pigment stripes. Melanophore organization depends on signals provided by cells of the yellow xanthophore lineage via airinemes, long filamentous projections with vesicles at their tips. We show that airineme extension from originating cells, as well as vesicle deposition on target cells, depend on interactions with macrophages. These findings identify a role for macrophages in relaying long-range signals between nonimmune cells. This signaling modality may function in the remodeling and homeostasis of other tissues during normal development and disease.
authors.affiliation: Department of Biology, University of Washington, Seattle, WA 98195, USA.
authors.forename: Dae Seok
authors.identifier: 0000-0002-0617-8788
authors.initials: DS
authors.lastname: Eom
authors.affiliation: Department of Biology, University of Washington, Seattle, WA 98195, USA. dparichy@virginia.edu.
authors.forename: David M
authors.identifier: 0000-0001-8984-088X
authors.initials: DM
authors.lastname: Parichy
mesh_terms: D000818:Animals; D019521:Body Patterning; D002450:Cell Communication; D002465:Cell Movement; D004625:Embryo, Nonmammalian / Q000166:cytology; D008264:Macrophages / Q000502:physiology*; D008547:Melanophores / Q000502:physiology*; D015398:Signal Transduction; D012880:Skin Pigmentation; D015027:Zebrafish / Q000196:embryology