title: Dynamic pattern of endothelial cell adhesion molecule expression in muscle and perineural vessels from patients with classic polyarteritis nodosa.
abstract: OBJECTIVE
  To investigate endothelial cell adhesion molecule expression in vessels from patients with classic polyarteritis nodosa (PAN).
  
  
  METHODS
  Frozen sections of 21 muscle and 16 nerve samples from 30 patients with biopsy-proven PAN and 12 histologically normal muscle and 2 histologically normal nerve samples from 12 controls were studied immunohistochemically, using specific monoclonal antibodies (MAb) that recognize adhesion molecules. Adhesion molecules identified were intercellular adhesion molecule 1 (ICAM-1), ICAM-2, ICAM-3, vascular cell adhesion molecule 1 (VCAM-1), platelet endothelial cell adhesion molecule 1 (PECAM-1), E-selectin, P-selectin, L-selectin, lymphocyte function-associated antigen 1 (LFA-1), and very late activation antigen 4 (VLA-4). Neutrophils were identified with a MAb recognizing neutrophil elastase. Endothelial cells were identified with the lectin ulex europaeus.
  
  
  RESULTS
  In early lesions, expression of PECAM-1, ICAM-1, ICAM-2, and P-selectin was similar to that in control samples, and VCAM-1 and E-selectin were induced in vascular endothelium. In advanced lesions, immunostaining for adhesion molecules diminished or disappeared in luminal endothelium, whereas these molecules were clearly expressed in microvessels within and surrounding inflamed vessels. Staining in endothelia from vessels in a healing stage tended to be negative. A high proportion of infiltrating leukocytes expressed LFA-1 and VLA-4, and only a minority expressed L-selectin. No relationship between the expression pattern of adhesion molecules and clinical features, disease duration, or previous corticosteroid treatment was observed.
  
  
  CONCLUSIONS
  Endothelial adhesion molecule expression in PAN is a dynamic process that varies according to the histopathologic stage of the vascular lesions. The preferential expression of constitutive and inducible adhesion molecules in microvessels suggests that angiogenesis contributes to the persistence of inflammatory infiltration in PAN.
authors.affiliation: University of Barcelona, Spain.
authors.forename: B
authors.initials: B
authors.lastname: Coll-Vinent
authors.forename: M
authors.initials: M
authors.lastname: Cebrián
authors.forename: M C
authors.initials: MC
authors.lastname: Cid
authors.forename: C
authors.initials: C
authors.lastname: Font
authors.forename: J
authors.initials: J
authors.lastname: Esparza
authors.forename: M
authors.initials: M
authors.lastname: Juan
authors.forename: J
authors.initials: J
authors.lastname: Yagüe
authors.forename: A
authors.initials: A
authors.lastname: Urbano-Márquez
authors.forename: J M
authors.initials: JM
authors.lastname: Grau
mesh_terms: D000328:Adult; D000368:Aged; D000911:Antibodies, Monoclonal; D001808:Blood Vessels / Q000378:metabolism / Q000473:pathology; D015815:Cell Adhesion Molecules / Q000378:metabolism; D004730:Endothelium, Vascular / Q000378:metabolism; D005260:Female; D006801:Humans; D007150:Immunohistochemistry / Q000379:methods; D008297:Male; D008875:Middle Aged; D009132:Muscles / Q000378:metabolism* / Q000473:pathology; D010488:Polyarteritis Nodosa / Q000378:metabolism* / Q000473:pathology; D013497:Sural Nerve / Q000098:blood supply* / Q000473:pathology; D019010:Vascular Cell Adhesion Molecule-1 / Q000378:metabolism
chemical_list: D000911:Antibodies, Monoclonal; D015815:Cell Adhesion Molecules; D019010:Vascular Cell Adhesion Molecule-1