Evidence for the Progression Through S-phase in the Ectopic Cell Cycle Re-entry of Neurons in Alzheimer Disease

Overview

Journal Aging (Albany NY)

Specialty Geriatrics

Date 2009 Dec 1

PMID 19946466

Citations 49

Authors

David J Bonda

Teresa A Evans

Corrado Santocanale

Jesus Catala Llosa

Jose Vina

Vladan P Bajic

Rudy J Castellani

Sandra L Siedlak

George Perry

Mark A Smith

Hyoung-gon Lee

Affiliations

Soon will be listed here.

Abstract

Aberrant neuronal re-entry into the cell cycle is emerging as a potential pathological mechanism in Alzheimer disease (AD). However, while cyclins, cyclin dependent kinases (CDKs), and other mitotic factors are ectopically expressed in neurons, many of these proteins are also involved in other pathological and physiological processes, generating continued debate on whether such markers are truly indicative of a bona fide cell cycle process. To address this issue, here we analyzed one of the minichromosome maintenance (Mcm) proteins that plays a role in DNA replication and becomes phosphorylated by the S-phase promoting CDKs and Cdc7 during DNA synthesis. We found phosphorylated Mcm2 (pMcm2) markedly associated with neurofibrillary tangles, neuropil threads, and dystrophic neurites in AD but not in aged-matched controls. These data not only provide further evidence for cell cycle aberrations in AD, but the cytoplasmic, rather than nuclear, localization of pMcm2 suggests an abnormal cellular distribution of this important replication factor in AD that may explain resultant cell cycle stasis and consequent neuronal degeneration.

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