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[Results of patch test using mite components in atopic dermatitis (AD) patients. 1st report. "As is patch test" using
A Kumei1, H Nakayama, M Sakurai
1Department of Deramtology, Saiseikai Central Hospital.
Unlabelled:
As is patch test using crushed live mites and crushed dried dead mites of Dermatophagoides pteronyssinus (D.p.), Dermatophagoides farinae (D.f.), & Tryophagus ptrescentiae (T.p.) was performed on 49 AD patients and 18 control patients suffering from dermatitis other than AD.
Results:
1) with crushed dried dead mites all patients showed negative reactions but with live mites 11 among 49 AD patients were positive (22.4%); 2) female mites were more positive than males at the rate 8:1; 3) with cases positive to mites, (a) D.p. was positive in all 11 positive cases (100%), (b) D.f. was negative in 5 cases (0%), and (c) T.p. was positive in 2 cases among 4 (50%); 4) because of the pathological manifestations of spongiosis and the infiltration of histiocytes and lymphocytes, the possibility of contact allergy to mite elements was suggested, as a mechanism of atopic dermatitis.
Insights
Live mite allergens, particularly Dermatophagoides pteronyssinus, may trigger allergic contact dermatitis in atopic dermatitis patients. Female mites showed a higher positive reaction rate in patch testing.
Area of Science:
- Allergen immunotherapy
- Dermatology
- Immunology
Context:
- Atopic dermatitis (AD) is a common inflammatory skin condition.
- The role of environmental allergens, such as house dust mites, in AD pathogenesis is under investigation.
- Previous studies suggest a link between mite sensitization and AD severity.
Purpose:
- To investigate the potential of mite allergens as a cause of allergic contact dermatitis in AD patients.
- To compare the reactivity to live versus dead mites of Dermatophagoides pteronyssinus, Dermatophagoides farinae, and Tyrophagus putrescentiae.
- To explore the correlation between mite allergy and specific pathological findings in AD.
Summary:
- A patch test was conducted on 49 AD patients and 18 controls using live and dead mites (D. pteronyssinus, D. farinae, T. putrescentiae).
- Positive reactions were observed in 22.4% of AD patients exposed to live mites, with D. pteronyssinus being the most frequent allergen.
- Female mites elicited a stronger allergic response than male mites.
Impact:
- Findings suggest that live mite allergens may contribute to the development of allergic contact dermatitis in a subset of AD patients.
- The study highlights the potential role of mite elements in the immunological mechanisms underlying atopic dermatitis.
- This research could inform diagnostic and therapeutic strategies for managing AD, particularly in individuals with suspected mite hypersensitivity.