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The pathogenic role of pemphigus antibodies and proteinase in epidermal acantholysis
Abstract:
The pathogenic role of pemphigus autoantibodies and proteinases in epidermal acantholysis has been studied in organ cultures of normal human skin. Dose-dependent acantholysis occurred in skin explants cultured in medium containing 2-30 mg/ml of gamma-globulin from pemphigus serum. Acantholysis was not seen in explants cultured with 2 mg/ml pemphigus gamma-globulin although antibody binding to the epidermis was observed. Some degenerative changes in addition to acantholysis were present when 30 mg/ml pemphigus gamma-globulin was added to the medium. The addition of N,ethylmaleimide(NEM) and ethylene diamine tetraacetate(EDTA) prevented binding of pemphigus antibody to epidermis in culture. Soybean trypsin inhibitor and pepstatin had no effect on binding of pemphigus antibody to the epidermis but they did inhibit acantholysis in vitro. Our results suggest that pemphigus-induced acantholysis may be caused by at least 2 different types of enzyme.
Insights
Pemphigus autoantibodies cause skin blistering (acantholysis) by activating at least two distinct enzymes. This study used organ cultures to investigate the mechanisms of pemphigus pathogenesis.
Area of Science:
- Dermatology
- Immunology
- Biochemistry
Background:
- Pemphigus is an autoimmune blistering disease characterized by acantholysis, the loss of intercellular adhesion in the epidermis.
- The precise mechanisms by which pemphigus autoantibodies and associated factors induce acantholysis are not fully understood.
Purpose of the Study:
- To investigate the pathogenic role of pemphigus autoantibodies and proteinases in epidermal acantholysis using organ culture models.
- To elucidate the involvement of enzymatic pathways in pemphigus-induced skin blistering.
Main Methods:
- Organ cultures of normal human skin were utilized.
- Skin explants were cultured in media supplemented with varying concentrations of gamma-globulin from pemphigus serum.
- The effects of enzyme inhibitors, such as N-ethylmaleimide (NEM), ethylene diamine tetraacetate (EDTA), soybean trypsin inhibitor, and pepstatin, were assessed on antibody binding and acantholysis.
Main Results:
- Dose-dependent acantholysis was observed in skin explants cultured with pemphigus gamma-globulin.
- Antibody binding occurred even at concentrations that did not induce acantholysis, suggesting a threshold effect.
- Enzyme inhibitors (soybean trypsin inhibitor and pepstatin) inhibited acantholysis in vitro, while NEM and EDTA prevented antibody binding.
Conclusions:
- Pemphigus-induced acantholysis is likely mediated by at least two different types of enzymes.
- These findings contribute to understanding the complex molecular mechanisms underlying pemphigus pathogenesis.
- The study highlights the potential for targeting specific enzymatic pathways in pemphigus treatment.