What is the role of autoantibodies in the pathophysiology of guttate psoriasis?

Updated: Oct 03, 2019
  • Author: Kirstin Altman, MD; Chief Editor: Dirk M Elston, MD  more...
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Answer

Immunoblotting has demonstrated intense antistreptococcal antibody activity in the sera of patients with guttate psoriasis. Immunoglobulin G (IgG) antibodies against 3 different S pyogenes proteins—namely, a 60-, a 70-, and a 14-kd antigen—have been identified. Indirect immunofluorescence studies of these antibodies showed that they react only with autologous skin in patients with guttate psoriasis and not with normal skin or lesional skin from patients who do not have psoriasis. [34, 40]

Autoantibodies in psoriatic sera may recognize certain structures in the transformed keratinocytes of affected psoriatic skin. These autoantibodies cross-react with streptococcal antigens. Cross-reaction has been demonstrated on immunofluorescent microscopy by using a monoclonal antibody (mAb 111-15504) to group A streptococci, which does not cross-react with antigens in normal human skin. These antigens were associated with class 1M protein and were mostly concentrated in the dermal papillae around the capillaries and inside the cells of the epidermal basal layer.


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