Journal
JOURNAL OF NEUROSCIENCE RESEARCH
Volume 85, Issue 8, Pages 1744-1751Publisher
WILEY-LISS
DOI: 10.1002/jnr.21301
Keywords
cell cycle; Alzheimer's disease; PHF1; entorhinal cortex; hippocampus
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Growing evidence suggests that one of the earliest events in the neuronal degeneration of Alzheimer's disease (AD) is aberrant cell-cycle activation in postmitotic neurons, which may, in fact, be sufficient to initiate the neurodegenerative cascade. In the present study we examined whether cyclins and cyclin-dependent kinases, molecules normally associated with cell-cycle control, may be involved in delayed expression of altered Alzheimer's proteins in two interconnected areas, the entorhinal cortex (EC) and the dentate gyrus (DG), after a hippocampal excitotoxic lesion. Several cell-cycle proteins of the G, and S phases and even of the G(2) phase were found to be up-regulated in the EC after kainic acid evoked neuronal death in the hippocampus. In addition, we describe the progressive expression of two Alzheimer's-related proteins, PHF-1 and APP, which reached higher levels immediately after the increase in G,/S-phase markers. Hence,,the results of the present study support the participation of cell-, cycle dysregulation as a key component of the process that may ultimately lead to expression of, AD proteins and neuronal death in a brain area when the target site for synaptic inputs in that area is damaged by an excitotoxic insult. (c) 2007 Wiley-Liss, Inc.
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