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Veterinary Pathology, Vol 32, Issue 6 628-634, Copyright © 1995 by American College of Veterinary Pathologists

ARTICLES

Histochemical study of cutaneous mucins in hypothyroid dogs

S. Doliger, M. Delverdier, J. More, L. Longeart, A. Regnier and J. P. Magnol
Service d'Anatomie Pathologique, Ecole Nationale Veterinaire, Toulouse, France.

A dermal mucinosis, visualized as dermal alcianophilic material, is occasionally present in canine hypothyroidism (myxedema). Various histochemical reactions (alcian blue/periodic acid-Schiff [PAS], alcian blue at pH 2.6, alcian blue at pH 1.0, critical electrolytical concentrations with and without dimethylsulfoxide, differential hydrolysis by hyaluronidases) were performed on skin biopsies from six dogs (four females and two males ranging from 8 to 13 years) affected by hypothyroidism, all of them presenting dermal mucinosis in hematoxylin and eosin-stained sections. In these dogs, the only polysaccharidic compound involved in the dermal mucinosis was hyaluronic acid. In this study, hyaluronic acid dermal deposits of hypothyroid dogs were significantly different from those of controls in subepidermal connective tissue and loose reticular connective tissue but not in periadnexal zones. We recommend the combined alcian blue/PAS reaction as a routine technique to assess dermal mucinosis in hypothyroid dogs.




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Copyright © 1995 by the American College of Veterinary Pathologists.