Abstract
The deposition of abnormal levels of tau protein is a major neuropathological feature of progressive supranuclear palsy (PSP), and the presence of tuft-shaped astrocytes is a neuropathological hallmark of PSP. We examined the topographic distribution of tuft-shaped astrocytes in the cerebral hemisphere by Gallyas-Braak silver staining in three Japanese autopsy cases of typical PSP. The distribution of tuft-shaped astrocytes was relatively uniform between cases. Tuft-shaped astrocytes were identified predominantly in posterior frontal areas such as the precentral gyrus and premotor and supplementary motor areas (Brodmann areas 4, 6 and 8). Tuft-shaped astrocytes were most dense in areas of cortical convexity, and they were more abundant in the crests of the cerebral gyri than in the valleys of the cerebral sulci. The temporal, parietal and occipital cortices, including the hippocampal formation and cingulate gyrus, were relatively free of tuft-shaped astrocytes. We confirmed involvement of the cerebral cortex in the pathology of PSP, and showed the widespread presence of tuft-shaped astrocytes, particularly in the precentral gyrus and premotor and supplementary motor areas, to be an essential neuropathological feature of PSP. Th...Continue Reading
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