title: Co-localization of beta-peptide and phosphorylated tau in astrocytes in a patient with corticobasal degeneration.
abstract: The co-localization of amyloid beta (Abeta) and phosphorylated tau in astrocytes in a patient with corticobasal degeneration is described. At autopsy, the present case exhibited neuropathological findings compatible with those of corticobasal degeneration, including atrophy of the frontal and temporal lobes, neuronal loss and gliosis in the cortical and subcortical regions, and presence of cortical ballooned neurons and astrocytic plaques. Moreover, many senile plaques were found in the cerebral cortex. There were also clusters of Abeta-positive granules associated with astrocytic cytoplasm and processes in the subiculum and entorhinal cortex. In the entorhinal cortex, the Abeta-positive granules were occasionally co-localized with phosphorylated tau-positive fibrillary structures in the astrocytic cytoplasm. To our knowledge, this is the first demonstration of co-localization of Abeta and phosphorylated tau in astrocytes. This phenomenon implies that phagocytosis of Abeta coincides with production of phosphorylated tau in the same reactive astrocytes.
authors.affiliation: Department of Neuropathology, Institute of Brain Science, Hirosaki University School of Medicine, Hirosaki, Japan. koichi@cc.hirosaki-u.ac.jp
authors.forename: Koichi
authors.initials: K
authors.lastname: Wakabayashi
authors.forename: Fumiaki
authors.initials: F
authors.lastname: Mori
authors.forename: Masato
authors.initials: M
authors.lastname: Hasegawa
authors.forename: Tomomi
authors.initials: T
authors.lastname: Kusumi
authors.forename: Ihoko
authors.initials: I
authors.lastname: Yoshimura
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Takahashi
authors.forename: Sunao
authors.initials: S
authors.lastname: Kaneko
mesh_terms: D016229:Amyloid beta-Peptides / Q000378:metabolism*; D001253:Astrocytes / Q000378:metabolism / Q000473:pathology*; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D008875:Middle Aged; D019636:Neurodegenerative Diseases / Q000378:metabolism / Q000473:pathology* / Q000503:physiopathology; D010766:Phosphorylation; D058225:Plaque, Amyloid / Q000378:metabolism / Q000473:pathology; D016875:tau Proteins / Q000378:metabolism*
chemical_list: D016229:Amyloid beta-Peptides; D016875:tau Proteins