title: Identical expression of ELAM-1, VCAM-1, and ICAM-1 in sarcoidosis and usual interstitial pneumonitis.
abstract: Extravasation of leucocytes in tissues is mediated by leucocyte-endothelial cell interactions in which adhesion molecules play an important role. Until now, two pathways have been unravelled, i.e., the LFA-1/ICAM-1 and the VLA-4/VCAM-1 pathways. ELAM-1 has been shown to be involved in granulocyte accumulation and recently also in lymphocyte migration. The role of HECA-452 is under investigation. In this study we have investigated the expression of the above-mentioned adhesion molecules in lung tissue of patients with pulmonary sarcoidosis and usual interstitial pneumonitis (UIP), and in mediastinal lymph nodes of patients with sarcoidosis. ICAM-1 (CD54) was broadly distributed on the endothelium of all the vessels found in sarcoidosis and UIP. VCAM-1 was present on the endothelium of the venules, capillaries, and arterioles in both sarcoidosis and UIP. ELAM-1 reacted with endothelial cells lining venules and capillaries in chronic progressive sarcoidosis and in the active phase of UIP but not in the stationary phases of both diseases. HECA-452 activity could be detected only on high endothelial venules within sarcoid lymph nodes. In lung tissues, macrophages bearing the ICAM-1 antigen were present in sarcoid tissue but not in the interstitium and alveolar space of UIP. LFA-1 (CD11a/CD18) and VLA-4 (CD49d/CD29) were present on all leucocytes found but seemed to be more highly expressed on lymphocytes in sarcoidosis. These findings suggest that the LFA-1/ICAM-1 and VLA-4/VCAM-1 pathways are involved in leucocyte migration in both types of lung disease, while in the active phases of sarcoidosis and UIP, ELAM-1 is also involved.
authors.affiliation: Department of Pathology, Free University Hospital, De Boelelaan, Amsterdam, The Netherlands.
authors.forename: A C
authors.initials: AC
authors.lastname: van Dinther-Janssen
authors.forename: T C
authors.initials: TC
authors.lastname: van Maarsseveen
authors.forename: H
authors.initials: H
authors.lastname: Eckert
authors.forename: W
authors.initials: W
authors.lastname: Newman
authors.forename: C J
authors.initials: CJ
authors.lastname: Meijer
mesh_terms: D000328:Adult; D015815:Cell Adhesion Molecules / Q000032:analysis*; D019040:E-Selectin; D005260:Female; D006801:Humans; D018799:Intercellular Adhesion Molecule-1; D008168:Lung / Q000737:chemistry*; D008198:Lymph Nodes / Q000737:chemistry; D008297:Male; D008875:Middle Aged; D011658:Pulmonary Fibrosis / Q000378:metabolism*; D012507:Sarcoidosis / Q000378:metabolism*; D019010:Vascular Cell Adhesion Molecule-1
chemical_list: D015815:Cell Adhesion Molecules; D019040:E-Selectin; D019010:Vascular Cell Adhesion Molecule-1; D018799:Intercellular Adhesion Molecule-1