title: Platelet-derived growth factor-A and its receptor are expressed in separate, but adjacent cell layers of the mouse embryo.
abstract: The localized developmental expression of murine platelet-derived growth factor A (PDGF-A) was compared to that of its receptor (Pdgfra). Our in situ hybridization study included germ layers of primitive streak embryos, early axial structures (dermatome, myotome, sclerotome, floor plate), the skin and some of its derivatives (hair and mammary gland), the developing forelimb, the branchial arches and various sense organs (otic vesicle, olfactory epithelium and the eye). We report that PDGF-A and Pdgfra are expressed in separate, but adjacent cell layers in these structures and that in most, the ligand is expressed in the epithelium, whereas the receptor in the mesenchyme. This localization corresponds to classical experimental evidence for developmental interactions across cell layers. We suggest that the spatio-temporal regulation of PDGF-A and Pdgfra, and other related systems, represents one model for the spatial regulation of receptor-ligand interactions.
authors.affiliation: Department of Chemical Immunology, Weizmann Institute of Science, Rehovot, Israel.
authors.forename: A
authors.initials: A
authors.lastname: Orr-Urtreger
authors.forename: P
authors.initials: P
authors.lastname: Lonai
mesh_terms: D000818:Animals; D005314:Embryonic and Fetal Development / Q000235:genetics*; D004848:Epithelium / Q000502:physiology; D015870:Gene Expression / Q000502:physiology; D005796:Genes / Q000235:genetics*; D008648:Mesoderm / Q000502:physiology*; D051379:Mice; D008815:Mice, Inbred Strains; D015336:Molecular Probe Techniques; D009024:Morphogenesis / Q000235:genetics; D010982:Platelet-Derived Growth Factor / Q000235:genetics* / Q000378:metabolism; D011485:Protein Binding / Q000235:genetics; D017479:Receptors, Platelet-Derived Growth Factor / Q000235:genetics* / Q000378:metabolism
chemical_list: D010982:Platelet-Derived Growth Factor; C075278:platelet-derived growth factor A; D017479:Receptors, Platelet-Derived Growth Factor