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The mechanism(s) underlying selective neuronal death in Alzheimer's disease remain unresolved. However, recently, we and others showed that susceptible hippocampal neurones in Alzheimer's disease express markers common to cells in various phases of the cell cycle. Since neuronal maturation is associated with effective escape from the cell division cycle, emergence out of quiescence may be deleterious. Here, we review a number of current findings indicating that disregulated ectopic re-activation of cell cycle-mediated events, akin to neoplasia, represent an important early pathway associated with neuronal death and, more importantly, one that involves virtually the entire spectrum of the pathological events described in Alzheimer's disease.
Raina et al. (1999) studied this question.