Comparative Study of Cerebellar Degeneration in Canine Neuroaxonal Dystrophy, Cerebellar Cortical Abiotrophy, and Neuronal Ceroid-Lipofuscinosis

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The cerebellar lesions of three dogs with canine neuroaxonal dystrophy (NAD), one dog with cerebellar cortical abiotrophy (CCA), and four dogs with neuronal ceroid-lipofuscinosis (NCL) were examined to understand their pathogeneses. Purkinje cell loss was most severe in the vermis of a dog with CCA, and granule cell loss was most prominent in the cerebellar hemisphere of dogs with NCL. Immunohistochemically, CD3-and HLA-DR-positive cells were most frequent in the dogs with NCL, and moderate in dogs with NAD, but not in a dog with CCA. The number of cleaved caspase 3-positive cells was prominent in a dog with CCA, but no significant in the dogs with NAD. The results indicate different pathway of neuronal loss of these canine neuronal disorders.