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• W2014795196 abstract "Paraneoplastic cerebellar degeneration (PCD) is characterized by loss of Purkinje cells (PCs) associated with progressive pancerebellar dysfunction in the presence of onconeural Yo antibodies. These antibodies recognize the cerebellar degeneration-related antigens CDR2 and CDR2L. Response to PCD therapy is disappointing due to limited understanding of the neuropathological mechanisms. Here, we report the pathological role of CDR antibodies on the calcium homeostasis in PCs. We developed an antibody-mediated PCD model based on co-incubation of cerebellar organotypic slice culture with human patient serum or rabbit CDR2 and CDR2L antibodies. The CDR antibody-induced pathology was investigated by high-resolution multiphoton imaging and biochemical analysis. Both human and rabbit CDR antibodies were rapidly internalized by PCs and led to reduced immunoreactivity of calbindin D28K (CB) and L7/Pcp-2 as well as reduced dendritic arborizations in the remaining PCs. Washout of the CDR antibodies partially recovered CB immunoreactivity, suggesting a transient structural change in CB calcium-binding site. We discovered that CDR2 and CB co-immunoprecipitate. Furthermore, the expression levels of voltage-gated calcium channel Cav2.1, protein kinase C gamma and calcium-dependent protease, calpain-2, were increased after CDR antibody internalization. Inhibition of these signaling pathways prevented or attenuated CDR antibody-induced CB and L7/Pcp-2 immunoreactivity loss, morphological changes and increased protein expression. These results signify that CDR antibody internalization causes dysregulation of cell calcium homeostasis. Hence, drugs that modulate these events may represent novel neuroprotective therapies that limit the damaging effects of CDR antibodies and prevent PC neurodegeneration." @default.
• W2014795196 created "2016-06-24" @default.
• W2014795196 creator A5029677652 @default.
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• W2014795196 creator A5080923373 @default.
• W2014795196 date "2014-10-24" @default.
• W2014795196 modified "2023-09-24" @default.
• W2014795196 title "Paraneoplastic CDR2 and CDR2L antibodies affect Purkinje cell calcium homeostasis" @default.
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• W2014795196 doi "https://doi.org/10.1007/s00401-014-1351-6" @default.
• W2014795196 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4231287" @default.
• W2014795196 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/25341622" @default.
• W2014795196 hasPublicationYear "2014" @default.
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