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[Demodex folliculorum and rosacea: experimental and immunological studies]
Abstract:
When the immunological mechanism of the demodectic mange is well-known in dogs, few things are known about the role of Demodex mites in the pathogenesis of rosacea: the purpose of this study is the research of immunological reactions against Demodex antigens in 31 patients (24 papulopustular rosaceas and 7 granulomatous demodectic rosaceas histologically ascertained). Cultures or survival in vitro of human Demodex mites could not be obtained; therefore demodectic cysts of diseased goats (Demodex caprae) were gathered and soluble antigens were extracted by lyophilization. By different immunoserological methods, Demodex specific antibodies could be demonstrated in sera of rosacea (22%), of diseased goats and of rabbits sensitized with small amounts of demodectic antigen. Frequently cross-reactions were observed.
Insights
Immunological reactions to Demodex mites were investigated in rosacea patients. Specific antibodies were found in 22% of rosacea patients, suggesting a role for Demodex antigens in the condition.
Area of Science:
- Immunology
- Dermatology
- Parasitology
Context:
- While canine demodectic mange immunity is understood, the role of Demodex mites in human rosacea pathogenesis remains unclear.
- This study investigates immune responses to Demodex antigens in rosacea patients.
Purpose:
- To research immunological reactions against Demodex antigens in patients diagnosed with rosacea.
- To ascertain the presence of Demodex-specific antibodies in rosacea patient sera.
Summary:
- Due to difficulties culturing human Demodex mites, antigens were extracted from Demodex caprae cysts of diseased goats.
- Immunoserological methods detected Demodex-specific antibodies in 22% of rosacea patients, diseased goats, and sensitized rabbits.
- Frequent cross-reactions between antigens were observed during the study.
Impact:
- Provides evidence for the involvement of Demodex mites in the immunological aspect of rosacea.
- Highlights potential cross-reactivity in serological tests for Demodex-related conditions.
- Suggests further research into Demodex antigens for rosacea diagnosis and treatment.