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Effect of a novel topical diester glucocorticoid spray on immediate- and late-phase cutaneous allergic reactions in Maltese–beagle atopic dogs: a placebo-controlled study

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The inhibitory effect of 0.0584% hydrocortisone aceponate spray on immediate- and late-phase skin reactions and the duration of inhibition after medication withdrawal were studied in 10 Maltese-beagle atopic dogs. All subjects were sprayed on axillary and inguinal regions and on one randomly chosen side of the thorax once daily for 14 (phase 1) or 7 days (phase 2). Intradermal injections (IDT) of histamine and anticanine IgE antiserum were performed bilaterally on the thorax before, 7 and 14 days after treatment. During phase 2, IDT was performed once weekly for 5 weeks. Each IDT was evaluated by an investigator blinded to the site of active treatment. Skin biopsies of 24-h anti-IgE-associated late-phase reactions were collected from both thoracic sides before and 14 days after treatment to determine the number of inflammatory cells and dermal thickness. Phase 1: Histamine and anti-IgE-induced global wheal scores at treated sites were significantly lower after 7 and 14 days with negative reactions present in >90% of dogs. Late-phase reactions at both sides were also significantly decreased compared with that at baseline, and this was associated with reduced inflammatory cell influx. Moreover, a significant decrease in dermal thickness was recorded at treated sides after 14 days. Phase 2: Histamine reactions became positive at untreated sides in all dogs 2 weeks after treatment. In conclusion, the 0.0584% hydrocortisone aceponate spray significantly decreased immediate- and late-phase IDT reactions, and prolonged application caused skin atrophy at treated sites. A 2-week withdrawal period prior to IDT is proposed.
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Document Type: Research Article

Affiliations: Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, 4700 Hillsborough Street, Raleigh, NC, USA

Publication date: February 1, 2010

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