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Pathophysiology of generalized pustular psoriasis
Hajime Iizuka1, Hidetoshi Takahashi, Akemi Ishida-Yamamoto
1Department of Dermatology, Asahikawa Medical College, Midorigaoka-Higashi 2-1-1-1, 078-8510, Asahikawa, Japan.
Archives of Dermatological Research
|April 5, 2003
Summary
Generalized pustular psoriasis (GPP) is a severe skin condition with two subtypes: GPP with prior psoriasis (pso(+) GPP) and GPP without prior psoriasis (pso(-) GPP). Both involve neutrophil activation, but differ in onset and triggers.
Area of Science:
- Dermatology
- Immunology
Background:
- Generalized pustular psoriasis (GPP) is a severe dermatological condition.
- GPP is proposed to be classified into two subtypes: pso(+) GPP (with prior psoriasis history) and pso(-) GPP (without prior psoriasis history).
Purpose of the Study:
- To analyze the clinical and immunological differences between pso(+) GPP and pso(-) GPP.
- To understand the underlying mechanisms of GPP pathogenesis.
Main Methods:
- Comparative analysis of clinical features between pso(+) GPP and pso(-) GPP.
- Review of existing Japanese analyses and HLA data.
- Evaluation of epidermal changes and cell proliferation in GPP.
Main Results:
- pso(-) GPP onset is earlier and frequently follows infections, while pso(+) GPP onset is later and often follows corticosteroid therapy.
- Distinct HLA associations are observed between the two subtypes.
- Neutrophil activation is a common mechanism, with pso(+) GPP exhibiting more psoriasiform epidermal architecture than pso(-) GPP.
- Epidermal cell proliferation in GPP is comparable to psoriasis vulgaris.
Conclusions:
- GPP subtypes exhibit distinct clinical characteristics and potential pathomechanisms.
- Inflammatory cytokines likely play a role in the neutrophilic infiltrate in GPP.