Altered subcellular distribution of transcriptional regulators in response to Aβ peptide and during Alzheimer's disease

Document Type

Conference Proceeding

Abstract

Recent studies have shown that various cell cycle proteins are expressed in post-mitotic neurons within affected brain regions during Alzheimer's disease (AD). Cell cycle proteins have been proposed to function in mechanisms of neuronal cell death during AD. To further explore the role of cell cycle proteins in neurodegeneration associated with AD, we utilized PC12 cells to examine the subcellular distribution of cell cycle transcriptional regulators, including the retinoblastoma gene product (pRb), E2F1 and FAC1, during β-amyloid (Aβ)-induced neurodegeneration. Moreover, we examined the immunolocalization of pRb and E2F1 in non-demented control and AD brain tissue. We found that pRb exhibited increased levels of Ser795 phosphorylation in response to Aβ in the nucleus of PC12 cells and also in the nucleus of a subset of neurons during AD. E2F1 was distributed throughout the cytoplasm and neurites of PC12 cells in response to Aβ and in the cytoplasm of cells in AD brain. FAC1 exhibited a rapid redistribution from the cytoplasm to the perinuclear region in PC12 cells treated with Aβ. These data indicate that altered phosphorylation and subcellular distribution of transcriptional regulators occur in response to Aβ-induced neurotoxicity and during AD. © 2001 Published by Elsevier Science Ireland Ltd.

Keywords

Alzheimer's disease, Cell cycle, E2F1, Retinoblastoma protein, Transcription factor

Publication Date

10-25-2001

Publication Title

Mechanisms of Ageing and Development

ISSN

00476374

Volume

123

Issue

1

First Page

11

Last Page

20

PubMed ID

11640947

Digital Object Identifier (DOI)

10.1016/S0047-6374(01)00334-7

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