当前位置： SCI文献检索 > NEUROSCIENCE期刊下所有文献 > Altered mitogen-activated protein kinase signaling, tau hyperphosphorylation and mild spatial learning dysfunction in transgenic rats expressing the beta-amyloid peptide intracellularly in hippocampal and cortical neurons.

Altered mitogen-activated protein kinase signaling, tau hyperphosphorylation and mild spatial learning dysfunction in transgenic rats expressing the beta-amyloid peptide intracellularly in hippocampal and cortical neurons.

Abstract：

:The pathological significance of intracellular Abeta accumulation in vivo is not yet fully understood. To address this, we have studied transgenic rats expressing Alzheimer's-related transgenes that accumulate Abeta intraneuronally in the cerebral and hippocampal cortices but do not develop extracellular amyloid plaques. In these rats, the presence of intraneuronal Abeta is sufficient to provoke up-regulation of the phosphorylated form of extracellular-regulated kinase (ERK) 2 and its enzymatic activity in the hippocampus while no changes were observed in the activity or phosphorylation status of other putative tau kinases such as p38, glycogen synthase kinase 3, and cycline-dependent kinase 5. The increase in active phospho-ERK2 was accompanied by increased levels of tau phosphorylation at S396 and S404 ERK2 sites and a decrease in the phosphorylation of the CREB kinase p90RSK. In a water maze paradigm, male transgenic rats displayed a mild spatial learning deficit relative to control littermates. Our results suggest that in the absence of plaques, intraneuronal accumulation of Abeta peptide correlates with the initial steps in the tau-phosphorylation cascade, alterations in ERK2 signaling and impairment of higher CNS functions in male rats.

journal_name

Neuroscience

journal_title

Neuroscience

authors

Echeverria V,Ducatenzeiler A,Dowd E,Jänne J,Grant SM,Szyf M,Wandosell F,Avila J,Grimm H,Dunnett SB,Hartmann T,Alhonen L,Cuello AC

doi

10.1016/j.neuroscience.2004.07.036

keywords:

subject

Has Abstract

pub_date

2004-01-01 00:00:00

pages

583-92

issue

3

eissn

0306-4522

issn

1873-7544

pii

S0306-4522(04)00604-9

journal_volume

129

pub_type

杂志文章

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