We quantitatively assessed the antigenic properties of the neurofibrillary tangles (NFT) located in neurons of the tegmental nuclei of the pontine raphe in progressive supranuclear palsy (PSP) and Alzheimer's disease (AD). These properties were then compared with those of NFT of AD located in hippocampal neurons. Antibodies known to react with cortical NFT of AD were used to stain sections from PSP, AD, and control cases. The reaction with the straight filaments of NFT of PSP and with the paired helical filaments of pontine NFT of AD was ascertained by immunoelectron microscopy. The results show that, despite the ultrastructural difference, straight filaments in NFT of PSP and paired helical filaments in NFT of AD share antigenic properties when they are located in the same neuronal population. In contrast, paired helical filaments located in the cerebral cortex are antigenically different from those in pontine nuclei. Location, more than structure, may play a role as determinant of antigenic properties in straight filaments of PSP and paired helical filaments of AD.
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