Dermal and glomerular deposition of IgA in anaphylactoid purpura
J. Giangiacomo and C. C. Tsai
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 anti-human 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.
