title: IgA class anticardiolipin antibodies in cutaneous leukocytoclastic vasculitis.
abstract: BACKGROUND
  Autoantibodies may be detected in the serum of some patients with cutaneous leukocytoclastic vasculitis. We have previously reported the presence of IgA anticardiolipin antibodies (ACAs) in one patient with leukocytoclastic vasculitis associated with IgA nephropathy.
  
  
  OBJECTIVE
  Our purpose was to determine the prevalence of IgA ACAs in unselected groups of patients with cutaneous vasculitis, IgA nephropathy, and Henoch-Schönlein purpura.
  
  
  METHODS
  Thirty patients (10 each with cutaneous vasculitis, IgA nephropathy, and Henoch-Schönlein purpura) and 31 healthy control subjects were studied. ACA titers were measured by a standardized enzyme-linked immunosorbent assay.
  
  
  RESULTS
  ACAs restricted to the IgA isotype were present in 6 of 10 patients with cutaneous leukocytoclastic vasculitis. IgA ACA levels were significantly higher in these patients than in the control subjects. The presence of IgA ACAs did not correlate with disease severity or involvement of other organs and persisted after resolution of the vasculitis in most patients. In five of the six patients with IgA ACAs, drugs were implicated in the pathogenesis of the vasculitis. By contrast, ACAs were present in only a minority of children with Henoch-Schönlein purpura and adults with IgA nephropathy and were not restricted to the IgA isotype.
  
  
  CONCLUSIONS
  We have demonstrated a clear association between IgA ACAs and cutaneous leukocytoclastic vasculitis. The absence of IgA ACAs in Henoch-Schönlein purpura argues against their being an epiphenomenon in vasculitis.
authors.affiliation: Department of Dermatology, Western Infirmary, Glasgow, Scotland, UK.
authors.forename: A D
authors.initials: AD
authors.lastname: Burden
authors.forename: D M
authors.initials: DM
authors.lastname: Tillman
authors.forename: P
authors.initials: P
authors.lastname: Foley
authors.forename: E
authors.initials: E
authors.lastname: Holme
mesh_terms: D000328:Adult; D000368:Aged; D017153:Antibodies, Anticardiolipin / Q000097:blood*; D001323:Autoantibodies / Q000097:blood; D002648:Child; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D005922:Glomerulonephritis, IGA / Q000097:blood / Q000276:immunology; D006801:Humans; D011695:IgA Vasculitis / Q000097:blood / Q000276:immunology; D007070:Immunoglobulin A / Q000097:blood*; D007132:Immunoglobulin Isotypes / Q000097:blood; D008297:Male; D008875:Middle Aged; D017445:Skin Diseases, Vascular / Q000097:blood / Q000276:immunology*; D018366:Vasculitis, Leukocytoclastic, Cutaneous / Q000097:blood / Q000276:immunology*
chemical_list: D017153:Antibodies, Anticardiolipin; D001323:Autoantibodies; D007070:Immunoglobulin A; D007132:Immunoglobulin Isotypes