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• W2087635764 endingPage "AN20090035" @default.
• W2087635764 startingPage "AN20090035" @default.
• W2087635764 abstract "The contribution of astrocytes to the pathophysiology of AD (Alzheimer's disease) and the molecular and signalling mechanisms that potentially underlie them are still very poorly understood. However, there is mounting evidence that calcium dysregulation in astrocytes may be playing a key role. Intercellular calcium waves in astrocyte networks in vitro can be mechanically induced after Aβ (amyloid β-peptide) treatment, and spontaneously forming intercellular calcium waves have recently been shown in vivo in an APP (amyloid precursor protein)/PS1 (presenilin 1) Alzheimer's transgenic mouse model. However, spontaneous intercellular calcium transients and waves have not been observed in vitro in isolated astrocyte cultures in response to direct Aβ stimulation in the absence of potentially confounding signalling from other cell types. Here, we show that Aβ alone at relatively low concentrations is directly able to induce intracellular calcium transients and spontaneous intercellular calcium waves in isolated astrocytes in purified cultures, raising the possibility of a potential direct effect of Aβ exposure on astrocytes in vivo in the Alzheimer's brain. Waves did not occur immediately after Aβ treatment, but were delayed by many minutes before spontaneously forming, suggesting that intracellular signalling mechanisms required sufficient time to activate before intercellular effects at the network level become evident. Furthermore, the dynamics of intercellular calcium waves were heterogeneous, with distinct radial or longitudinal propagation orientations. Lastly, we also show that changes in the expression levels of the intermediate filament proteins GFAP (glial fibrillary acidic protein) and S100B are affected by Aβ-induced calcium changes differently, with GFAP being more dependent on calcium levels than S100B." @default.
• W2087635764 created "2016-06-24" @default.
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• W2087635764 date "2010-01-25" @default.
• W2087635764 modified "2023-10-18" @default.
• W2087635764 title "Amyloid β-Peptide Directly Induces Spontaneous Calcium Transients, Delayed Intercellular Calcium Waves and Gliosis in Rat Cortical Astrocytes" @default.
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• W2087635764 doi "https://doi.org/10.1042/an20090035" @default.
• W2087635764 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2810812" @default.
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