title: uPARAP expression during murine lung development.
abstract: Lung remodeling requires active collagen deposition and degradation. Urokinase plasminogen activator receptor-associated protein (uPARAP), or Endo 180, is a cell-surface receptor for collagens, which leads to collagen internalization and degradation. Thus, uPARAP-mediated collagen degradation is an additional pathway for matrix remodeling in addition to matrix remodeling mediated by matrix metalloproteinases and cathepsins. Using immunohistochemistry, we demonstrate extensive uPARAP expression in the mesenchyme throughout murine lung development. By immunofluorescence, we demonstrate significant overlap of uPARAP expression with collagen IV expression, but minimal overlap with collagen I expression in the developing murine lung. Finally, we compared lung development between wild-type and uPARAP(-/-) mice, and found no significant histologic differences, indicating the presence of alternative collagen degradation pathways during murine lung development.
authors.affiliation: Division of Pulmonary and Critical Care Medicine, Department of Medicine, Harborview Medical Center, University of Washington, Box 359640, 325 9th Ave, Seattle, WA 98104, USA.
authors.forename: Leah
authors.initials: L
authors.lastname: Smith
authors.forename: Teresa E
authors.initials: TE
authors.lastname: Wagner
authors.forename: Isham
authors.initials: I
authors.lastname: Huizar
authors.forename: Lynn M
authors.initials: LM
authors.lastname: Schnapp
mesh_terms: D000818:Animals; D024042:Collagen Type I / Q000378:metabolism; D024141:Collagen Type IV / Q000378:metabolism; D008168:Lung / Q000196:embryology* / Q000378:metabolism; D008562:Membrane Glycoproteins / Q000378:metabolism*; D051379:Mice / Q000196:embryology* / Q000235:genetics; D011956:Receptors, Cell Surface / Q000378:metabolism*
chemical_list: D024042:Collagen Type I; D024141:Collagen Type IV; D008562:Membrane Glycoproteins; C474081:Mrc2 protein, mouse; D011956:Receptors, Cell Surface