Mutations in presenilins are the major cause of familial Alzheimer's disease, but the pathogenic mechanism by which presenilin mutations cause memory loss and neurodegeneration remains unclear. Here we demonstrate that conditional double knockout mice lacking both presenilins in the postnatal forebrain exhibit impairments in hippocampal memory and synaptic plasticity. These deficits are associated with specific reductions in NMDA receptor-mediated responses and synaptic levels of NMDA receptors and alphaCaMKII. Furthermore, loss of presenilins causes reduced expression of CBP and CREB/CBP target genes, such as c-fos and BDNF. With increasing age, mutant mice develop striking neurodegeneration of the cerebral cortex and worsening impairments of memory and synaptic function. Neurodegeneration is accompanied by increased levels of the Cdk5 activator p25 and hyperphosphorylated tau. These results define essential roles and molecular targets of presenilins in synaptic plasticity, learning and memory, and neuronal survival in the adult cerebral cortex.
Loss of presenilin function causes impairments of memory and synaptic plasticity followed by age-dependent neurodegeneration.
C. Saura,Se-Young Choi,V. Beglopoulos,Seema Malkani,Dawei Zhang,Dawei Zhang,B. Rao,S. Chattarji,R. J. Kelleher,E. Kandel,K. Duff,A. Kirkwood,Jie Shen
Published 2004 in Neuron
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- Publication year
2004
- Venue
Neuron
- Publication date
2004-04-08
- Fields of study
Biology, Medicine, Psychology
- Identifiers
- External record
- Source metadata
Semantic Scholar, PubMed
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