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Journal Article
Research Support, Non-U.S. Gov't
Initial studies with high resolution TEM and electron energy loss spectroscopy studies of ferritin cores extracted from brains of patients with progressive supranuclear palsy and Alzheimer disease.
Cellular and Molecular Biology 2000 June
Studies of crystallographic structure and composition of core nanocrystals of ferritin bound to aberrant tau filaments extracted from progressive supranuclear Palsy (PSP) and Alzheimer disease (AD) brain tissues were performed using high resolution transmission electron microscopy (HRTEM) and electron energy loss spectroscopy (EELS). The results were compared with those obtained from synthetic Fe3O4 crystal (magnetite) and horse spleen ferritin cores. Core dimensions of ferritin molecules from PSP and AD were similar to those found in normal brain. Ferritin cores nanocrystals in AD seems to have less ordered structure than in PSP. Some nanocrystals did not have the hexagonal ferrihydrite structure generally found in healthy ferritin but rather a cubic structure similar to magnetite, a crystalline form in which both Fe2+ and Fe3+ are present. The presence of ferrous ion, Fe2+, may indicate some dysfunction in these pathological ferritins that might contribute to production of free radicals via the Fenton reaction involved in neurodegeneration.
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