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- W4323053954 abstract "In Alzheimer9s disease, amyloid-β peptide aggregates in the extracellular space to form senile plaques. The process of plaque deposition and growth has been modeled on the basis of <i>in vitro</i> experiments in ways that lead to divergent predictions: either a diffusion-limited growth model in which plaques grow by first-order kinetics, or a dynamic model of continual deposition and asymmetrical clearance in which plaques reach a stable size and stop growing but evolve morphologically over time. The models have not been tested <i>in vivo</i> because plaques are too small (by several orders of magnitude) for conventional imaging modalities. We now report<i>in vivo</i> multiphoton laser scanning imaging of thioflavine S-stained senile plaques in the Tg2576 transgenic mouse model of Alzheimer9s disease to test these biophysical models and show that there is no detectable change in plaque size over extended periods of time. Qualitatively, geometric features remain unchanged over time in the vast majority of the 349 plaques imaged and re-imaged. Intervals as long as 5 months were obtained. Nonetheless, rare examples of growth or shrinkage of individual plaques do occur, and new plaques appear between imaging sessions. These results indicate that thioflavine S-positive plaques appear and then are stable, supporting a dynamic feedback model of plaque growth." @default.
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- W4323053954 date "2001-02-01" @default.
- W4323053954 modified "2023-10-17" @default.
- W4323053954 title "Growth Arrest of Individual Senile Plaques in a Model of Alzheimer's Disease Observed by<i>In Vivo</i>Multiphoton Microscopy" @default.
- W4323053954 doi "https://doi.org/10.1523/jneurosci.21-03-00858.2001" @default.
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