September 1977

Dermal and Glomerular Deposition of IgA in Anaphylactoid Purpura

Author Affiliations

From the Departments of Pediatrics (Dr Giangiacomo) and Pathology (Dr Tsai), St Louis University School of Medicine, Cardinal Glennon Memorial Hospital For Children, St Louis.

Am J Dis Child. 1977;131(9):981-983. doi:10.1001/archpedi.1977.02120220047007

• During the period of acute anaphylactoid purpura, skin biopsies were performed on 14 patients with purpuric and nonpurpuric skin. In addition, four patients had renal biopsies. Examination of the tissue by immunofluorescence to antihuman immunoglobulins IgG, IgA, IgM, and IgE, fibrin/fibrinogen, complement Clq, C4, and C3 demonstrated predominant IgA, C3, fibrin/fibrinogen in the purpuric skin and glomerulus, without Clq and C4.

These immunohistochemical findings are characteristic of anaphylactoid purpura and suggest that IgA is involved in the pathogenesis of anaphylactoid purpura and may operate through the alternate pathway of the complement system.

(Am J Dis Child 131:981-983, 1977)