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  • Title: Phosphorylated Smad 2/3 colocalizes with phospho-tau inclusions in Pick disease, progressive supranuclear palsy, and corticobasal degeneration but not with alpha-synuclein inclusions in multiple system atrophy or dementia with Lewy bodies.
    Author: Chalmers KA, Love S.
    Journal: J Neuropathol Exp Neurol; 2007 Nov; 66(11):1019-26. PubMed ID: 17984683.
    Abstract:
    Impaired transduction of transforming growth factor-beta signaling has recently been implicated in Alzheimer disease. Transforming growth factor-beta signals are transduced by Smads, which are phosphorylated and translocated to the nucleus, where they initiate gene transcription. In Alzheimer disease, neurofibrillary tangles sequester phosphorylated Smad 2/3 (pSmad2/3) and reduce its nuclear translocation. We have now investigated the relationship between pSmad2/3 and phospho-tau in 3 other tauopathies, Pick disease, progressive supranuclear palsy, and corticobasal degeneration, and in 2 alpha-synucleinopathies, dementia with Lewy bodies and multiple system atrophy. In Pick disease, progressive supranuclear palsy, and corticobasal degeneration, pSmad2/3 was demonstrated in neuronal and glial nuclei but also colocalized with cytoplasmic tau inclusions. No pSmad2/3 was detected in glial cytoplasmic inclusions in multiple system atrophy or in Lewy bodies in dementia with Lewy bodies. Our data indicate that phospho-tau but not alpha-synuclein cytoplasmic inclusions bind pSmad2/3. The preservation of neuronal nuclear pSmad2/3 in Pick disease, progressive supranuclear palsy, and corticobasal degeneration suggests that cytoplasmic sequestration of pSmad2/3 is likely to have less impact on transforming growth factor-beta signal transduction in these diseases than in Alzheimer disease.
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