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• W2005351302 abstract "Dogs with Canine Cognitive Dysfunction (CCD) accumulate amyloid beta (Aβ) in the brain. As the cognitive decline and neuropathology of these old dogs share features with Alzheimer’s disease (AD), the relation between Aβ and cognitive decline in animal models of cognitive decline is of interest to the understanding of AD. However, the sensitivity of the biomarker Pittsburgh Compound B (PiB) to the presence of Aβ in humans and in other mammalian species is in doubt. To test the sensitivity and assess the distribution of Aβ in dog brain, we mapped the brains of dogs with signs of CCD (n=16) and a control group (n=4) of healthy dogs with radioactively labeled PiB ([11C]PiB). Structural MRI brain scans were obtained from each dog. Tracer washout analysis yielded parametric maps of PIB retention in brain. In the CCD group, dogs had significant retention of [11C]PiB in the cerebellum, compared to the cerebral cortex. Retention in the cerebellum is at variance with evidence from brains of humans with AD. To confirm the lack of sensitivity, we stained two dog brains with the immunohistochemical marker 6E10, which is sensitive to the presence of both Aβ and Aβ precursor protein (AβPP). The 6E10 stain revealed intracellular material positive for Aβ or AβPP, or both, in Purkinje cells. The brains of the two groups of dogs did not have significantly different patterns of [11C]PiB binding, suggesting that the material detected with 6E10 is AβPP rather than Aβ. As the comparison with the histological images revealed no correlation between the [11C]PiB and Aβ and AβPP deposits in post-mortem brain, the marked intracellular staining implies intracellular involvement of amyloid processing in the dog brain. We conclude that PET maps of [11C]PiB retention in brain of dogs with CCD fundamentally differ from the images obtained in most humans with AD." @default.
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• W2005351302 date "2013-01-01" @default.
• W2005351302 modified "2023-10-15" @default.
• W2005351302 title "PiB Fails to Map Amyloid Deposits in Cerebral Cortex of Aged Dogs with Canine Cognitive Dysfunction" @default.
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• W2005351302 doi "https://doi.org/10.3389/fnagi.2013.00099" @default.
• W2005351302 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3874561" @default.
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