title: Leucocyte/endothelial cell adhesion receptors in muscle biopsies from patients with idiopathic inflammatory myopathies (IIM).
abstract: Interactions between leucocytes and endothelial cells through specific adhesion receptors play an increasingly recognized crucial role in the development of inflammatory infiltrates in chronic inflammatory diseases. In this study we investigated adhesion molecule expression in muscle biopsies from 18 dermatomyositis, six polymyositis, five inclusion-body myositis patients and from eight normal controls. Immunohistochemical detection of leucocyte integrins LFA-1 and VLA-4, their endothelial counter-receptors intercellular adhesion molecule-1 (ICAM-1) and vascular cell adhesion molecule-1 (VCAM-1), and the endothelial cell markers CD31 and von Willebrand factor-related antigen (vWFAg) was performed using specific MoAbs and an alkaline phosphatase anti-alkaline phosphatase technique. ICAM-1 expression was up-regulated and VCAM-1 induced in muscle capillaries of dermatomyositis samples. In both dermatomyositis and polymyositis, endothelial cells from vessels surrounded by inflammatory infiltrates strongly expressed ICAM-1 and VCAM-1. Infiltrating leucocytes were intensively LFA-1- and VLA-4-positive. These data suggest that leucocyte/endothelial cell interactions mediated by the receptor/ligand pairs LFA-1/ICAM-1 and VLA-4/VCAM-1 actively participate in the development of muscle inflammatory infiltrates in the major inflammatory myopathies. In addition, ICAM-1 and VCAM-1 over-expression by capillary endothelial cells in dermatomyositis supports the hypothesis that capillary activation and/or injury is a major feature in this disease.
authors.affiliation: Department of Internal Medicine, Hospital Clinic i Provincial, Barcelona, Spain.
authors.forename: M C
authors.initials: MC
authors.lastname: Cid
authors.forename: J M
authors.initials: JM
authors.lastname: Grau
authors.forename: J
authors.initials: J
authors.lastname: Casademont
authors.forename: E
authors.initials: E
authors.lastname: Tobías
authors.forename: A
authors.initials: A
authors.lastname: Picazo
authors.forename: B
authors.initials: B
authors.lastname: Coll-Vinent
authors.forename: J
authors.initials: J
authors.lastname: Esparza
authors.forename: E
authors.initials: E
authors.lastname: Pedrol
authors.forename: A
authors.initials: A
authors.lastname: Urbano-Márquez
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000469:Alkaline Phosphatase / Q000276:immunology; D000911:Antibodies, Monoclonal / Q000276:immunology; D001706:Biopsy; D002448:Cell Adhesion / Q000276:immunology*; D002648:Child; D002675:Child, Preschool; D003882:Dermatomyositis / Q000276:immunology*; D004730:Endothelium, Vascular / Q000166:cytology / Q000276:immunology*; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D007249:Inflammation; D039041:Integrin alpha4beta1; D016023:Integrins / Q000276:immunology / Q000378:metabolism*; D018799:Intercellular Adhesion Molecule-1 / Q000276:immunology / Q000378:metabolism*; D007962:Leukocytes / Q000276:immunology*; D016169:Lymphocyte Function-Associated Antigen-1 / Q000276:immunology / Q000378:metabolism*; D008297:Male; D008875:Middle Aged; D009132:Muscles / Q000276:immunology* / Q000378:metabolism*; D018979:Myositis, Inclusion Body / Q000276:immunology*; D019408:Platelet Endothelial Cell Adhesion Molecule-1 / Q000276:immunology / Q000378:metabolism; D017285:Polymyositis / Q000276:immunology*; D011956:Receptors, Cell Surface / Q000276:immunology; D016201:Receptors, Lymphocyte Homing / Q000276:immunology / Q000378:metabolism*; D015854:Up-Regulation; D019010:Vascular Cell Adhesion Molecule-1 / Q000276:immunology / Q000378:metabolism*; D014841:von Willebrand Factor / Q000276:immunology / Q000378:metabolism
chemical_list: D000911:Antibodies, Monoclonal; D039041:Integrin alpha4beta1; D016023:Integrins; D016169:Lymphocyte Function-Associated Antigen-1; D019408:Platelet Endothelial Cell Adhesion Molecule-1; D011956:Receptors, Cell Surface; D016201:Receptors, Lymphocyte Homing; D019010:Vascular Cell Adhesion Molecule-1; D014841:von Willebrand Factor; D018799:Intercellular Adhesion Molecule-1; D000469:Alkaline Phosphatase