Abstract | OBJECTIVE: To determine the functionality of canine anti-Malassezia IgE via the passive transfer of immediate hypersensitivity localized to the skin (ie, cutaneous anaphylaxis) from atopic dogs with dermatitis attributable to overgrowth of Malassezia pachydermatis (Malassezia dermatitis [MD]) to healthy recipient dogs by use of the Prausnitz-Küstner (P-K) technique. ANIMALS: 7 clinically normal dogs, 32 atopic dogs with MD, serum from 11 atopic dogs with MD, and 3 healthy dogs without prior sensitization to M pachydermatis. PROCEDURE: Serum from atopic dogs with MD was used for P-K tests in 3 clinically normal recipient dogs. Serial dilutions of untreated, heat-inactivated, IgE-absorbed, and bovine serum albumin (BSA)-absorbed (control) aliquots of serum were injected ID in triplicate for dermal sensitization. Twenty-four, 48, and 72 hours later, a crude extract of M pachydermatis was injected ID into the sites used for sensitization injections, and immediate hypersensitivity reactions were graded on a 4-point scale. RESULTS: Untreated serum caused P-K reactivity beginning 24 hours after passive sensitization and persisting through 72 hours (titers, 1:32 to 1:64). Heat inactivation and IgE-absorption of serum eliminated P-K reactivity, whereas treatment of serum with BSA did not. CONCLUSIONS AND CLINICAL RELEVANCE: Analysis of P-K test results supports the passive transfer of cutaneous anaphylaxis by anti-Malassezia IgE and indicates it is functional in type-1 hypersensitivity reactions of atopic dogs with MD. Reduction or blockade of anti-Malassezia IgE in atopic dogs with MD may provide better clinical control of the disease.
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Authors | Daniel O Morris, Douglas J DeBoer |
Journal | American journal of veterinary research
(Am J Vet Res)
Vol. 64
Issue 3
Pg. 262-6
(Mar 2003)
ISSN: 0002-9645 [Print] United States |
PMID | 12661863
(Publication Type: Clinical Trial, Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- Antibodies, Fungal
- Antigens, Fungal
- Immune Sera
- Immunoglobulin E
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Topics |
- Animals
- Antibodies, Fungal
(immunology)
- Antigens, Fungal
(immunology)
- Dermatitis, Atopic
(complications, immunology, veterinary)
- Dermatomycoses
(complications, immunology, veterinary)
- Dog Diseases
(immunology)
- Dogs
- Female
- Hypersensitivity, Immediate
(complications, immunology, microbiology, veterinary)
- Immune Sera
(immunology)
- Immunization, Passive
(veterinary)
- Immunoglobulin E
(immunology)
- Malassezia
(immunology)
- Male
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