Investigations on the nature and pathogenicity of circulating antikeratinocyte antibodies in dogs with pemphigus foliaceus.

In humans with pemphigus foliaceus (PF), pathogenic autoantibodies are principally of IgG4 subclass and they cause superficial vesiculation when injected into neonatal mice. The objectives of this study were to determine the isotypes of circulating antikeratinocyte antibodies in dogs with PF, to assess whether serum antikeratinocyte antibody titres decreased during successful treatment, and to study whether such antibodies were pathogenic in passive transfers. Using indirect immunofluorescence with neonatal mouse skin substrates, circulating antikeratinocyte IgG antibodies were detected in 36 of 44 dogs with PF (82%).

Junctional epidermolysis bullosa in two domestic shorthair kittens.

This article describes two cases of junctional epidermolysis bullosa in nonrelated kittens. Both cats exhibited pinnal erosions, oral ulcerations and severe onychomadesis. Histopathology, electron microscopy and/or indirect immunoperoxidase revealed subepidermal clefting, with the lamina densa remaining attached to the floor of the vesicles.

Acquired féline hair shaft abnormality resembling trichorrhexis nodosa in humans.

Abstract  A 2-year-old castrated male domestic short-haired cat presented with self-induced alopecia associated with whitish nodes on the remaining hair shafts. Light and scanning microscopy demonstrated swellings of the hair shafts, accompanied by cuticular damage leading to hair fractures with a typical brush-like appearance. A díagnosis of trichorrhexis nodosa associated with flea allergy dermatitis was made.

Congenital Ichthyosis in Two Cavalier King Charles Spaniel Littermates.

Résumé- Une ichthiose congénitale chez deux chiots Cavalier King Charles est décrite. Les lésions chez le chiot le plus atteint étaient un squamosis modéré généralisé, des squames épaisses verruqueuses brunes sur l'abdomen et une hyperkératose aux marges des coussinets. L'histologie a révélé une importante hyperkératose orthokératosique et une couche granuleuse irrégulière, alors qu'en microscopie électronique on observait une division du cytoplasme des kéraitinocytes en trois compartiments et al persistence de la fixation des tonofilaments aux desmosomes dans les couches superficielles de l'épiderme.