Correlação entre achados clínicos, histopatológicos e imunomarcação de interleucina 31 na pele de cães com dermatite atópica
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2016-12-13
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Universidade Federal de Goiás
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Canine atopic dermatitis (CAD) is the second most frequent disease in dermatological clinical routine of dogs. It is defined as a pruritic allergic skin disease, with genetic predisposition and clinical features, being related to the response to environmental allergens. Interleukin 31 (IL) 31 is a cytokine that participates in inflammatory processes and it is associated with pruritic diseases, especially those involving chronic inflammation such as allergic dermatitis. Produced by mononuclear cells, IL-31 is described to play an important role in the pathogenesis of atopic dermatitis. Two studies were performed in order to correlate clinical features, histopathological changes and the presence of IL-31 in the skin of dogs with atopic dermatitis. 34 dogs were selected from clinical routine, which 31 animals were diagnosed with CAD and three were healthy. The animals were evaluated for pruritus level by the owners' report and by clinical examination according to the CAD extent and severity index (CADESI-4). The dogs were grouped in discreetly, moderately and markedly compromised by CAD following the sum of scores’ values assigned in the clinical examination. Cutaneous
samples from the axillary and interdigital regions of each dog were collected and submitted to histopathological (HE and toluidine blue) and immunohistochemical analyzes (IL-31). There was a correlation between the clinical score and the microscopic changes. As well, there was correlation among all the microscopic changes, but not between the degree of pruritus and the clinical score of CAD. Also, the inflammatory infiltrate was more intense in the axillary region in relation to interdigital skin. An increased numbers of cells immunostained for IL-31 was observed in dogs severely compromised by CAD. There was a correlation between the clinical score and the amount of interdigital mast cells, with an amount of cells immunostained for IL-31 in the axilla. It was also verified correlation between the amount of mast cells and cells immunostained for IL-31 in the axilla, as well as between acanthosis and all other histopathological alterations of the skin in the axillary region. We concluded that there is a correlation between severity of dermathological lesions, IL-31 immunostaining, mast cell count and histopathological changes in dogs with atopic dermatitis, but there is no correlation between the degree of pruritus reported by owners and severity of cutaneous lesions in animals with CAD. Moreover, the intensity of the inflammatory process may vary depending on the anatomical site of the lesion.
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GONÇALVES, B. H. R. Correlação entre achados clínicos, histopatológicos e imunomarcação de interleucina 31 na pele de cães com dermatite atópica. 2016. 59 f. Dissertação (Mestrado em Ciência Animal) - Universidade Federal de Goiás, Goiânia, 2016.