Journal of Toxicologic Pathology
Online ISSN : 1881-915X
Print ISSN : 0914-9198
ISSN-L : 0914-9198
Case Report
Chronic otitis externa with heat shock protein 70-positive intranuclear inclusion bodies in the ceruminous gland epithelium of a Chihuahua dog
Takeru KiuchiKenichi WatanabeShotaro NakagunKazurou MiyaharaNoriyuki HoriuchiYoshiyasu Kobayashi
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JOURNAL OPEN ACCESS

2022 Volume 35 Issue 1 Pages 83-87

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Abstract

A Chihuahua dog showed persistent itching in the right ear canal. Anti-inflammatory medicines and prednisolone were ineffective and total ear canal ablation was performed. Histological diagnosis was chronic otitis externa. Eosinophilic intranuclear inclusion bodies (Cowdry type A and full-type) were occasionally observed in the ceruminous gland epithelium. The inclusion bodies were negative for nucleic acid and ultrastructurally composed of fibrous structures (approximately 10 nm in width). Viral infection was initially suspected, but polymelase chain reaction tests did not detect the expected viral genes. Immunohistochemistry revealed that the inclusion bodies were positive for heat shock protein 70 (HSP70), suggesting that these bodies could be protein aggregates including HSP70. The etiology of this lesion has not been elucidated, but chronic inflammation may influence the cytoplasm-to-nuclear transportation of HSP70. To the best of our knowledge, this is the first report of canine chronic otitis externa with HSP70-positive intranuclear inclusion bodies.

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© 2022 The Japanese Society of Toxicologic Pathology
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