Progressive accumulation of amyloid-β oligomers in Alzheimer’s disease and APP transgenic mice is accompanied by selective alterations in synaptic scaffold proteins
| Autor: | Pham, Emiley, Crews, Leslie, Ubhi, Kiren, Hansen, Lawrence, Adame, Anthony, Cartier, Anna, Salmon, David, Galasko, Douglas, Michael, Sarah, Savas, Jeffrey N., Yates, John R., Glabe, Charles, Masliah, Eliezer |
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| Jazyk: | angličtina |
| Rok vydání: | 2010 |
| Předmět: |
Male
Synaptosomal-Associated Protein 25 Vesicle-Associated Membrane Protein 2 Dendritic Spines Mice Transgenic Nerve Tissue Proteins Article Amyloid beta-Protein Precursor Mice Cytosol Alzheimer Disease Animals Humans Cells Cultured Aged Aged 80 and over Cerebral Cortex Neurons Amyloid beta-Peptides Qa-SNARE Proteins Cell Membrane Microfilament Proteins Intracellular Signaling Peptides and Proteins Brain Membrane Proteins Peptide Fragments Mice Inbred C57BL Mice Inbred DBA Synapses Dementia Female Protein Multimerization Carrier Proteins Disks Large Homolog 4 Protein Guanylate Kinases Protein Binding |
| Popis: | The cognitive impairment in patients with Alzheimer's disease is closely associated with synaptic loss in the neocortex and limbic system. Although the neurotoxic effects of aggregated amyloid-beta oligomers in Alzheimer's disease have been studied extensively in experimental models, less is known about the characteristics of these aggregates across the spectrum of Alzheimer's disease. In this study, postmortem frontal cortex samples from controls and patients with Alzheimer's disease were fractionated and analyzed for levels of oligomers and synaptic proteins. We found that the levels of oligomers correlated with the severity of cognitive impairment (blessed information-memory-concentration score and mini-mental state examination) and with the loss of synaptic markers. Reduced levels of the synaptic vesicle protein, vesicle-associated membrane protein-2, and the postsynaptic protein, postsynaptic density-95, correlated with the levels of oligomers in the various fractions analyzed. The strongest associations were found with amyloid-beta dimers and pentamers. Co-immunoprecipitation and double-labeling experiments supported the possibility that amyloid-beta and postsynaptic density-95 interact at synaptic sites. Similarly, in transgenic mice expressing high levels of neuronal amyloid precursor protein, amyloid-beta co-immunoprecipitated with postsynaptic density-95. This was accompanied by a decrease in the levels of the postsynaptic proteins Shank1 and Shank3 in patients with Alzheimer's disease and in the brains of amyloid precursor protein transgenic mice. In conclusion, this study suggests that the presence of a subpopulation of amyloid-beta oligomers in the brains of patients with Alzheimer's disease might be related to alterations in selected synaptic proteins and cognitive impairment. |
| Databáze: | OpenAIRE |
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