PMID: 8960316Dec 1, 1996Paper

Pick's disease: hyperphosphorylated tau protein segregates to the somatoaxonal compartment

Acta Neuropathologica
Alphonse ProbstM G Spillantini

Abstract

Pick bodies and ballooned cells of Pick's disease and the neurofibrillary lesions of Alzheimer's disease are characterized by the presence of hyperphosphorylated microtubule-associated protein tau. Little is known about the mechanisms underlying tau hyperphosphorylation in Pick's disease and the distribution of abnormal tau in affected neurons. We have used a panel of phosphorylation-dependent (AT270, AT8, AT180, 12E8, PHF-1, AT10 and Tau-1) and phosphorylation-independent anti-tau antibodies (N-tau 5 and 134) to stain brain tissue sections from subjects with Pick's disease and Alzheimer's disease. These antibodies labeled Pick bodies and neurofibrillary lesions in a similar way, with the exception of antibody 12E8, which stained a subset of neurofibrillary tangles, but no Pick bodies. Moreover, abundant AT8- and PHF-1-positive neuritic profiles were observed in cortical areas rich in Pick bodies, even in the complete absence of neurofibrillary lesions. Unlike the Gallyas-positive neuropil threads of Alzheimer's disease, which were of variable diameter and covered by spiny appendages, neuritic profiles of Pick's disease showed a regular diameter, appeared smooth and were Gallyas-negative. In contrast to Alzheimer's disease, den...Continue Reading

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