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Volume 16, Number 21, Issue of November 1, 1996 pp. 6732-6741
Copyright ©1996 Society for NeuroscienceAge-Dependent Neuronal and Synaptic Degeneration in Mice Transgenic for the C Terminus of the Amyloid Precursor Protein
Received May 5, 1996; revised July 23, 1996; accepted Aug. 16, 1996.
Mary Lou Oster-Granite1, Donna L. McPhie2, Jane Greenan1, and Rachael L. Neve2 1 Division of Biomedical Sciences, University of California, Riverside, California 92521-0121, and 2 Department of Genetics, Harvard Medical School and McLean Hospital, Belmont, Massachusetts 02178
The molecular basis for the degeneration of neurons and the deposition of amyloid in plaques and in the cerebrovasculature in Alzheimer's disease (AD) is incompletely understood. We have proposed that one molecule common to these abnormal processes is a fragment of the Alzheimer amyloid precursor protein (APP) comprising the C-terminal 100 amino acids of this molecule (APP-C100). We tested this hypothesis by creating transgenic mice expressing APP-C100 in the brain. We report here that aging (18-28 month) APP-C100 transgenic mice exhibit profound degeneration of neurons and synapses in Ammon's horn and the dentate gyrus of the hippocampal formation. Of the 106 transgenic mice between 8 and 28 months of age that were examined, all of those older than 18 months displayed severe hippocampal degeneration. The numerous degenerating axonal profiles contained increased numbers of neurofilaments, whorls of membrane, and accumulations of debris resembling secondary lysosomes near the cell body. The dendrites of degenerating granule and pyramidal cells contained disorganized, wavy microtubules. Cerebral blood vessels had thickened refractile basal laminae, and microglia laden with debris lay adjacent to larger venous vessels. Mice transgenic for Flag-APP-C100 (in which the hydrophilic Flag tag was fused to the N terminus of APP-C100) showed a similar degree of neurodegeneration in the hippocampal formation as early as 12 months of age. The 45 control mice displayed only occasional necrotic cells and no extensive cell degeneration in the same brain regions. These findings show that APP-C100 is capable of causing some of the neuropathological features of AD.
Key words: Alzheimer's disease; amyloid; neurodegeneration; hippocampus; Flag tag; aging
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